California/State Highway Relations

This page describes California state highway route and county highway route relations. Note that Interstate and US routes are distinctly omitted from this page. Interstate and US highways are included in California's statewide highway numbering protocol, as California state routes deliberately do not collide in their numbering with Interstate routes and US routes. See below about "logical extensions" at the boundary of an Interstate route and a California state route which share the same route number.

State Routes

Highways that are officially a State Highway Route with the green ("'49er miner's spade") California numbered highway sign. Use network=US:CA on the route=road relation, along with a ref=* tag with a value of the route number. These vary from one lane for traffic in both directions (e.g. segments of Highway 35 in the Santa Cruz Mountains) to freeway with as many as 12 total traffic lanes, including carpool lanes and parallel entrance/exit lanes (e.g. Highway 91 in Los Angeles, Riverside and San Bernardino Counties) — as well as most possibilities in between. All are fully paved. California state highway numbers do not duplicate Interstate or US highway numbers, unless the state highway is a physically-connected continuation of an Interstate as a "logical extension" (because it does not meet all of the physical standards for an Interstate). To be clear, a "logical extension" isn't actually an Interstate route, it is a state route that does not meet Interstate standards, while deliberately numbered the same as the Interstate, as it may be upgraded to Interstate in the future. For example, State Routes 15, 110 and 210 connect to Interstates respectively so numbered, exactly at the junction where the state route's physical standards fall below minimum Interstate requirements.

The California Department of Transportation (Caltrans) administers signed "Scenic Highways," legislatively defined as part of California's "State Scenic Highway System". Some highways are defined as being "eligible" for becoming a Scenic Highway, but have not (yet) been given this designation. For those highways which are so designated, especially when signed as such (a rectangular sign with an orange California poppy — the state flower — on a medium-blue background with snow-covered dark green mountains in the bottom-background), use network=US:CA:Scenic on a separate route=road relation to designate it as part of this statewide subnetwork. Exactly two California Historic Parkways are defined as a subset of the State Scenic Highway System (network=US:CA:Scenic) and should be additionally tagged with historic=yes.

Use unsigned_ref=* when a State Route exists but is unsigned, as well as to distinguish which State Scenic Highways are which (as some may be unsigned with the Scenic Highway shield). Do use unsigned_ref=* on a designated Scenic Highway route relation which is unsigned with the Scenic Highway shield, but do not use this tag on an "eligible" (but not officially designated by Caltrans) Scenic Highway.

There are also several County Routes — or segments of them — which have been designated "Scenic Highways," the only visible difference being the sign is the same except it is pentagonal instead of rectangular.

1-49

Route number	Relation	Progress
1	156504 156504	North end to San Luis Obispo done. Ventura connection to 101 needs to be completed. (TIGER data are out of date?)
2	319538 319538
3	319600 319600
4	335190 335190
7	332406 332406	border crossing (south end) needs fixes
9	358142 358142
11	6198455 6198455 (north) 6198456 6198456 (south)	SE to border crossing is now (2022-Q3) under construction
12	334370 334370
14	157990 157990 157989 157989
15	1483011 1483011 (south) 1483010 1483010 (north)	"logical extension" of Interstate 15 between I-8 and I-5. May become part of Interstate 15 in the future.
16	334271 334271 (west section) 334981 334981 (east section)
17	309738 309738 (south) 161694 161694 (north)
18	349578 349578	fix routing through Big Bear area
19	325714 325714
20	331392 331392
22	151658 151658 151665 151665
23	157999 157999 158000 158000
24	215687 215687
25	330674 330674
26	335030 335030
27	324392 324392
29	334675 334675
32	333576 333576
33	324682 324682
34	357734 357734
35	358161 358161
36	319745 319745
37	309717 309717 309716 309716
38	349579 349579
39	273982 273982
41	309983 309983 309982 309982
43	326916 326916
44	331114 331114
45	333595 333595
46	334722 334722
47	357315 357315	partial
49	331070 331070

52-99

Route number	Relation	Progress
52	152267 152267 152268 152268
53	335124 335124
54	158001 158001 158002 158002
55	151673 151673 151671 151671
56	152734 152734 152732 152732
57	151622 151622 151621 151621
58	158220 158220
60	155931 155931 155913 155913
61	335541 335541
62	336887 336887
63	331088 331088
65	309751 309751 309752 309752
66	349539 349539
67	332003 332003
68	358079 358079
70	331086 331086
71	151836 151836 151835 151835
72	349553 349553	partial
73	151738 151738 151742 151742	Toll road
74	331873 331873
76	331822 331822
77	335615 335615
78	152727 152727
79	331829 331829	partial
82	157044 157044	Started north end
83	349536 349536
84	335071 335071
85	109570 109570 (North) 109571 109571 (South)	Complete
86	332331 332331
86S	332581 332581	future north end of CA 86
87	76279 76279	Complete
88	215685 215685
89	331103 331103
90	326011 326011 (west section east) 326012 326012 (west section west) 325937 325937 (east section)
91	151632 151632 151628 151628	Has "toll express lanes"
92	158178 158178
94	154462 154462 154463 154463
96	355720 355720
98	332399 332399
99	2469001 2469001 (north segment, north of sacramento) 158012 158012 (northbound) 158011 158011 (southbound)

102-198

Route number	Relation	Progress
102		Only in design phase; unconstructed
103	357321 357321	should mostly be motorway
104	334992 334992
105	8441059 8441059	Might the western portion of this (at merge of I-105) be considered a "logical extension" of Interstate 105?
107	358017 358017
108	331084 331084
110	319437 319437 319436 319436	"logical extension" of Interstate 110. May become part of Interstate 110 in the future. From Figueroa Street/Avenue 26 in Los Angeles to Glenarm Street in Pasadena, designated a California Historic Parkway (as well as a National Scenic Byway); the first freeway in the Western USA.
111	331994 331994	South end needs to be fixed
113	333772 333772
115	332438 332438
116	335103 335103
118	157987 157987 157988 157988
119	316932 316932
120	330991 330991
121	335096 335096
124	334984 334984
125	155367 155367 155360 155360	Toll road
126	309761 309761 309760 309760
127	337484 337484
128	335116 335116
131	357996 357996
132	335670 335670
133	151687 151687 (South) 151682 151682 (North)	Toll road
134	157986 157986 157985 157985
135	355845 355845
136	337474 337474
137	331093 331093
138	349640 349640	partial
139	332651 332651
140	7714229 7714229 (Super) 1642781 1642781 (East) 7714228 7714228 (West)
142	349534 349534
144	356563 356563
146	326420 326420
149	331384 331384
150	356561 356561
152	325143 325143
154	355952 355952
155	330758 330758
156	357761 357761	fix intersection with san juan road near Hollister
160	335069 335069	Is it signed through Sacramento?
161	332671 332671
162	333773 333773 (east section) 339458 339458 (west section)
163	151855 151855 151856 151856	Through Balboa Park in San Diego, designated a California Historic Parkway
164	448063 448063	unsigned; Complete
166	355844 355844
169	355719 355719
170	309993 309993 309992 309992
173	349746 349746
174	331488 331488
175	335123 335123
177	336885 336885
178	326793 326793 (west section) 337486 337486 (east section)	where is west end of east section?
180	330949 330949
183	357759 357759
184	326762 326762
185	335613 335613
189	349767 349767
190	330770 330770 (west section) 337475 337475 (east section)
192	356011 356011
193	331087 331087
197	355820 355820
198	330676 330676

200+

Route number	Relation	Progress
200	355713 355713
201	331489 331489
204	326851 326851
207	335216 335216
210	158671 158671 158669 158669	"logical extension" of Interstate 210. May become part of Interstate 210 in the future.
211	163687 163687	almost complete. Northern end unclear. Does it continue left or right?
213	358066 358066
216	334713 334713
217	357750 357750
218	358132 358132
219	335668 335668
220	2469248 2469248
221	335088 335088
225	356872 356872
229	334723 334723
232	357744 357744
236	358157 358157
237	109568 109568 (West) 109568 109568 (East)	Complete; has "toll express lanes"
238	335636 335636	At northern end / Castro Valley, connects to (unusually numbered) I-238 and I-580
241	151830 151830 (South) 151832 151832 (North)	Toll road
242	309701 309701 309700 309700
243	331935 331935
245	334712 334712
246	355934 355934
247	349627 349627
253	335153 335153
254	166583 166583	in progress
255	162119 162119	complete
261	151828 151828 (South) 151827 151827 (North)	Toll road
263	355747 355747
267	76331 76331	Complete
271	355694 355694
273	332645 332645
299	161078 161078
330	349574 349574
371	331835 331835
710	2471023 2471023	unsigned; a "logical extension?" of I-710 which does not meet Interstate standards. Legislation passed in 2019 authorizes its relinquishment to the City of Pasadena on or after January 1, 2024, which, if/as it happens, should allow this relation to be deleted from OSM. Then, a tidy-up of trunk and expressway tags is in order.
905	331516 331516	Planned to become Interstate 905 in the future; does not meet Interstate standards now (2022)

County Routes

California County Routes are designated by a letter followed by a number (e.g. "S2") on a distinct pentagonal blue shield. The letter indicates the zone the highway route is in (A, B, C, D, E, G, J, N, R, or S). A zone may cover multiple counties or split a county in two. The current county is clearly on the sign using this specific protocol. These "County Routes" are distinct from "State Routes" (numbered highways, above), and are in their own network in OSM. Use network=US:CA:CR.

County Routes — or segments of them — which have also been designated "Scenic Highways" on a separate route=road relation (the only visible difference being the sign is the same except it is pentagonal instead of rectangular) have this designation administered at the state-level by Caltrans along with the county, not solely at the county-level (all other administration / maintenance of County Scenic Routes is at the county-level). Use network=US:CA:CR:Scenic on the separate route=road relation.

A: Lassen, Plumas, Shasta, Siskiyou, Tehama

Route number	Relation	County	Progress
A1	2377508 2377508	Lassen
A2	2377519 2377519	Lassen
A3	2377530 2377530	Lassen
A5	2377531 2377531	Tehama
A6	2377532 2377532	Tehama
A7	2377533 2377533	Tehama
A8	2377534 2377534	Tehama
A9	2377535 2377535	Tehama
A10	2377509 2377509	Siskiyou
A11	2377510 2377510	Tehama
A12	2377511 2377511	Siskiyou
A13	2377512 2377512	Plumas
A14	2377513 2377513	Plumas
A15	2377514 2377514	Plumas
A16	2377515 2377515	Shasta
A17	2377516 2377516	Shasta, Tehama
A18	2377517 2377517	Shasta	Portions are part of the State Scenic Highway System
A19	2377518 2377518	Shasta
A20	2377520 2377520	Shasta
A21	2377521 2377521	Lassen, Plumas
A22	2377522 2377522	Plumas
A23	2377523 2377523	Plumas, Sierra
A24	2377524 2377524	Plumas, Sierra
A25	2377525 2377525	Lassen
A26	2377526 2377526	Lassen
A27	2377527 2377527	Lassen
A28	2377528 2377528	Siskiyou
A29	2377529 2377529	Siskiyou

B: Butte

Route number	Relation	County	Progress
B2	2377536 2377536	Butte

C: Sonoma

This County Route is poorly known but appears to be asserted by Sonoma County, Department of Transportation and Public Works, Roads Division (awaiting confirmation by telephone). It is unsigned. It may have been constructed partially with federal funds, making its classification / categorization as a "County Route" unusual, and helping to keep its existence vague, as it isn't found in (many) datasets which list such road assets, but there is this shield graphic. Some confusion exists.

As the person who writes this here and now, I never got a call back from the County (the various departments I spoke with nor their legal department, who I suggested — the roads department manager liked this — might do some research on some Caltrans-overlap that isn't readily apparant). My research largely indicates there are nine regions in the lettering, three each in northern, central and southern state sub-regions. So C, (C1), seems to be an outlier (making ten). There is a "figment of somebody's imagination" about C1, or at least some understandable vagueness / confusion present. I did not originally enter the route. I am (merely?) doing my best to "keep the situation tidy" as it happened. So, C1 "may be deleted as better data become available." I'd add "easily." Stevea (talk) 21:09, 13 July 2022 (UTC)

Route number	Relation	County	Progress
C1	8499470 8499470	Sonoma	unsigned; continues westerly from west terminus of State Route 128

I hereby submit that if this is indeed a "county route" that Sonoma County DoTPW,RD say to Caltrans "this is intended to be signed as a county route, what about E22?" and get that rolling. When it's thumbs-up to do that, order six or twelve pentagonal signs emblazoned with E22 and Sonoma County and erect them, done. OSM will follow.

D: Del Norte

Route number	Relation	County	Progress
D1	2377537 2377537	Del Norte
D2	2377538 2377538	Del Norte
D3	2377539 2377539	Del Norte
D4	2377540 2377540	Del Norte
D5	2377541 2377541	Del Norte
D6	2377542 2377542	Del Norte
D7	2377543 2377543	Del Norte
D8	2377544 2377544	Del Norte

E: Alpine, Amador, Butte, Calaveras, El Dorado, Placer, Plumas, Sacramento, Solano, Sonoma, Tuolumne, Yolo, Yuba

Route number	Relation	County	Progress
E1	2377545 2377545	Alpine
E2	2377556 2377556	Placer, Sacramento
E3	2377559 2377559	Placer, Sacramento
E4	2377560 2377560	Yolo
E5	2377561 2377561	Tuolomne
E6	2377562 2377562	Yolo
E7	2377563 2377563	Sonoma, Yolo
E8	2377564 2377564	Yolo
E9	2377565 2377565	Sacramento, Yolo
E10	2377546 2377546	Yolo
E11	2377547 2377547	Yolo
E12	2377548 2377548	Sacramento
E13	2377549 2377549	Sacramento	Portions are part of the State Scenic Highway System
E14	2377550 2377550	Sacramento
E15	2377551 2377551	Calaveras
E16	2377552 2377552	Amador, El Dorado
E17	2377553 2377553	Tuolomne
E18	2377554 2377554	Calaveras, Tualomne
E19	2377555 2377555	Yolo
E20	2377557 2377557	Yuba
E21	2377558 2377558	Butte, Plumas, Yuba

G: Monterey, San Benito, San Luis Obispo, Santa Clara, Santa Cruz

Route number	Relation	County	Progress
G1	2377566 2377566	San Benito
G2	156040 156040	Santa Clara	Complete
G3	105445 105445	Santa Clara	Complete
G4	156039 156039	Santa Clara	Complete
G5	1702480 1702480	Santa Clara
G6	74885 74885	Santa Clara	Complete
G7	2377578 2377578	Santa Clara
G11	2377568 2377568	Monterey, San Benito
G12	2377569 2377569	Santa Cruz, Monterey
G13	2377570 2377570	Monterey, San Benito
G14	2377571 2377571	Monterey, San Luis Obispo	Portions are part of the State Scenic Highway System
G15	2377572 2377572	Monterey
G16	2377573 2377573	Monterey
G17	2377574 2377574	Monterey
G18	2377575 2377575	Monterey
G19	2377576 2377576	Monterey, San Luis Obispo
G20	2377577 2377577	Santa Clara	Portions are part of the State Scenic Highway System
G21	1702479 1702479	Monterey

J: Alameda, Calaveras, Contra Costa, Fresno, Kern, Inyo, Mariposa, Merced, Sacramento, San Benito, San Joaquin, Stanislaus, Tulare, Tuolomne

Route number	Relation	County	Progress
J1	2377580 2377580	Fresno, San Benito
J2	2377591 2377591	Alameda, San Joaquin
J3	2377593 2377593	San Joaquin, Stanislaus
J4	2377595 2377595	Alameda, Contra Costa, San Joaquin
J5	2377597 2377597	San Joaquin
J6	2377599 2377599	San Joaquin, Stanislaus
J7	2377600 2377600	Merced, San Joaquin, Stanislaus
J8	2377601 2377601	Sacramento, San Joaquin
J9	2377602 2377602	Stanislaus, San Joaquin
J10	2377581 2377581	Sacramento, San Joaquin
J11	2377582 2377582	Sacramento, San Joaquin
J12	2377583 2377583	San Joaquin
J13		San Joaquin	only signed at western terminus as an easterly reassurance shield (near Lammers Road); 11th Street/I-205 Business
J14	2377585 2377585	Stanislaus, Calaveras
J15	2377586 2377586	Tulare
J16	2377587 2377587	Mariposa, Merced, Stanislaus
J17	2377588 2377588	Merced, Stanislaus
J18	2377589 2377589	Merced, Stanislaus
J19	2377590 2377590	Tulare, Fresno
J21		Tulare	unsigned
J22		Tulare	unsigned
J23	2377592 2377592	Tulare
J24		Tulare	unsigned
J25		Tulare	unsigned
J26		Tulare	unsigned
J27		Tulare	unsigned
J28		Tulare	unsigned
J29		Tulare	unsigned
J30	2377594 2377594	Tulare
J31		Tulare	unsigned
J32		Tulare	unsigned
J33		Tulare	unsigned
J34		Tulare	unsigned
J35		Tulare	unsigned
J36		Tulare	unsigned
J37		Tulare	unsigned
J38		Tulare	unsigned
J40		Fresno, Tulare	unsigned
J41	2377596 2377596	Inyo, Tulare
J42		Tulare	unsigned
J44		Kern, Tulare
J46		Tulare	unsigned
J59	2377598 2377598	Merced, Stanislaus, Tuolomne
J132	2377584 2377584	Mariposa, Tuolumne

N: Los Angeles, Orange

Route number	Relation	County	Progress
N1	5692609 5692609	Los Angeles	Portions are part of the State Scenic Highway System
N2	2377604 2377604	Los Angeles
N3	2377605 2377605	Los Angeles
N4		Los Angeles
N5		Los Angeles
N6		Los Angeles
N7	2377606 2377606	Los Angeles
N8	2377607 2377607	Los Angeles, Orange
N9	5692610 5692610	Los Angeles

R: Riverside

Route number	Relation	County	Progress
R2	3691011 3691011	Riverside	Complete
R3	2377609 2377609	Riverside

S: Imperial, Orange, Riverside, San Diego

Route number	Relation	County	Progress
S1	2377610 2377610	San Diego
S2	1483102 1483102	San Diego, Imperial	Complete
S3	2377622 2377622	San Diego
S4	1491051 1491051	San Diego	Complete
S5	2377628 2377628	San Diego
S6	1373347 1373347	San Diego	Complete (with a break at State Route 76)
S7	2377629 2377629	San Diego
S8	1491075 1491075	San Diego	Complete
S9	2377631 2377631	San Diego
S10	4476369 4476369	San Diego
S11	2377611 2377611	San Diego
S12	2377612 2377612	San Diego
S13	2377613 2377613	San Diego
S14	1491046 1491046	San Diego	Complete
S15	2377614 2377614	San Diego
S16	1594400 1594400	Riverside, San Diego
S17	2377615 2377615	San Diego
S18	938727 938727	Orange
S19	2377616 2377616	Orange
S21	2120232 2120232	San Diego
S22	1491060 1491060	San Diego	Complete
S24	2377617 2377617	Imperial
S25	14210765 14210765	Orange	Complete
S26	2377618 2377618	Imperial
S27	2377619 2377619	Imperial
S28	2377620 2377620	Imperial
S29	2377621 2377621	Imperial
S30	2377623 2377623	Imperial
S31	2377624 2377624	Imperial
S32	2377625 2377625	Imperial
S33	2377626 2377626	Imperial
S34	2377627 2377627	Imperial
S80	2377630 2377630	Imperial

Unlettered: San Bernardino

There is a County Route in San Bernardino County which was petitioned by the county to Caltrans to be part of the state-coordinated County Route system, but specifically without a "zone letter." This is signed with the same pentagonal blue shield displaying the name of the (single) county it is in, but emblazoned with simply a number and no "zone letter." So, because of the state coordination (and tangentially, similar signage), this road seems more similar to the "alphanumeric" County Routes (above, in the same section of this wiki), yet distinct from the "numeric only" scheme(s) of individual counties (below, in the next section of this wiki). For these reasons, on this specific route, use network=US:CA:CR.

Route number	Relation	County	Progress
66		San Bernardino

Routes (roads) numbered at the individual county level into a single-county numbered network

This section is "early emerging." As more specific county data become available and better-known, please update relevant sub-sections. This includes creating a new sub-section for any county which has a numbered county road network.

These roads do not fit into the "alphanumeric" network (above, in the previous section), as there are no "zone letters" and these roads are geographically restricted to and are numbered and administered by a single county. They are in their own section in this wiki because they (mostly) diverge from the blue pentagonal signage of the alphanumeric network of County Routes. Exceptionally, the Lake County routes do use blue pentagonal signage, but are not state-coordinated (as is County Route 66 in San Bernardino County, above).

Unlettered: Lake

There are many (four illustrated here) County Routes in California's Lake County (only?) designated using a different scheme than the "lettered zone" system in the rest of the state: they are "unlettered" with no "zone" region and are simply numbered, bypassing alphabetic zoning altogether. It does not appear that these routes or their numbering have any state coordination, rather they are completely administered at the Lake County level. These use the blue pentagonal shield emblazoned with "Lake County" and a number. Use network=US:CA:Lake.

Route number	Relation	County	Progress
145		Lake
502		Lake
505		Lake
515		Lake

Unlettered: Mendocino

California has at least one network of (nearly one thousand) numbered roads (over one thousand miles total) assigned by a single county, in Mendocino County. Currently (2022), none are mapped with route=road relations, though some ways are tagged with ref=*, the value being the number or alphanumeric assigned by the county. These route=road relations should be tagged network=US:CA:Mendocino. These are seldom signed, however signs as reassurance shields (green rectangle with white numbers: 431, 435) have been seen, for example around the Four Corners intersection (near Sinkyone State Wilderness). See the Talk page.

Other counties where roads in a numbered county network might or do exist

There are other counties where numbered roads exist, but it isn't clear whether they are a county network or simply a naming convention. For example, Tulare County has a "Road 150," though what isn't clear is whether this might more accurately be named "County Road 150" (Tulare County being the agency responsible for both naming and administration / maintenance of this road), whether it is signed with a "150" shield (of any style), whether the road has another (non-numeric) name and whether the collection of these roads together form a "numbered county network."

San Bernardino County (largest county by area in USA, not counting Alaska's Unorganized Borough, which isn't a county, but is directly administered by the state) contains county routes numbered in their ref=* tag with as many as six digits. These do not appeared to be signed; it may be correct to change such tags to unsigned_ref=* with the same value.

Humboldt County has a County Maintained Road System with a regularized (alphanumeric) numbering protocol partly based upon the road's land survey coordinates. However, except for a yellow sticker on older versions of a county-provided road sign or a newer version of such road signs which display the Humboldt County seal, it is believed that these roads are not signed with these numberings, but are only used for internal purposes by the county's Road Department. If such numberings are applied to roads in OSM, correctly tag with unsigned_ref=* rather than ref=* if there are no real-world (numbered or alphanumeric) signs.

Any other numbered roads belonging to an individual county network in California should be tagged network=US:CA:<county>. If and as these are tagged in OSM, distinguish between unsigned_ref=* or ref=* appropriately: use the latter only when there are real-world (numbered or alphanumeric) signs.

See Also

• Portal:California_roads
• County routes in California
• California/Freeway_ends