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The California State Highway Code confers upon the County Boards of Supervisors the authority to establish county highways. These highways remain county highways until abandoned by the order of the board of supervisors. There are standards defined for county highways in terms of construction (i.e., at least 40 feet wide), unless the route was established before January 1, 1945. The code also allows county highways to be freeways or expressways. Counties are also permitted to designated expressway systems, and counties may work together to coordinate county highways. All county highways which for a period of five consecutive years are impassable for vehicular travel, and on which during such period of time no public money is expended for maintenance, are considered to be unnecessary highways, and may be redesignated as stock trails.

In 1958, the County Supervisors Association of California (CSAC, now the California State Association of Counties) established the California County Route Marker Program, which was incorporated into the National Uniform County Route Marker Program adopted by the National Association of Counties (NACO) in 1967. This 13-point program designates the more important county routes by designating them as "County Sign Routes" and assigning route numbers to them. The program directs county Boards of Supervisors and road commissioners to select routes that adhere to the established criteria for route selection and that are (a) constructed to a reasonable standard, (b) are provided with adequate warning signs.

The basic County Route Marker Program is defined by NACO as follows:

A County Route Marker Program should not be confused with "Standard County Road Signs" or "Standard County Route Signing Programs." The County Route Marker Program should be clearly defined as a program to mark County routes of major importance that are of general public interest; that are constructed to sufficient standards to guarantee safe passage to the motorist; that are properly signed in conformace with the Manual on Uniform Traffic Control Devices to further ensure safe travel; and that have a logical beginning and logical terminus without reference to City, County, or State Boundaries.

This program had the bulk of its routes added between 1958 through 1970. There have been no new county sign routes added since 1983. Counties also maintain internal road numbers. Sometimes these numbers are reflected on the county roads, for example, in Tulare County, County Road SR140 is signed Road 140. In other counties, the numbers appear to be sequential (for example, Hall Road in Tehama County is County Road 53). Some counties don't seem to number their roads (such as Los Angeles county). Lastly, some counties use more complicated numbers (Oroville Dam Blvd East in Oroville is County Road 25473, and Greet Street in Tuolumne county is A54230).

Note that routes shown as ?nn have not yet had their numbers or signage confirmed.

County Routes by County

Alameda J2 · J4
Alpine E1
Amador E16
Butte B2 · E21
Calaveras E15 · E18 · J14
Colusa This county has no routes in the County Signed Route program.
Contra Costa J4
Del Norte D1 · D2 · D3 · D4 · D5 · D6 · D7 · D8
El Dorado E16
Fresno J1 · J19 · J40
Glenn This county has no routes in the County Signed Route program.
Humboldt This county has no routes in the County Signed Route program.
Imperial S2 · S22 · S24 · S26 · S27 · S28 · S29 · S30 · S31 · S32 · S33 · S34 · S78 · S80
Inyo J41
Kern J44
Kings This county has no routes in the County Signed Route program.
Lake 145 · 502 · 505 · 515 · ?4
Lassen A1 · A2 · A3 · A21 · A25 · A26 · A27
Los Angeles N1 · N2 · N3 · N4 · N5 · N6 · N7 · N8 · N9
Madera This county has no routes in the County Signed Route program.
Marin This county has no routes in the County Signed Route program.
Mariposa J16 · J20 · J132
Mendocino ?4
Merced J7 · J16 · J17 · J18 · J59
Modoc This county has no routes in the County Signed Route program.
Mono This county has no routes in the County Signed Route program.
Monterey G11 · G12 · G13 · G14 · G15 · G16 · G17 · G18 · G19 · G20
Napa This county has no routes in the County Signed Route program.
Nevada This county has no routes in the County Signed Route program.
Orange N8 · S18 · S19 · S25
Placer E2 · E3
Plumas A13 · A14 · A15 · A21 · A22 · A23 · A24 · E21
Riverside R2 · R3 · S16
Sacramento E2 · E3 · E9 · E12 · E13 · E14 · J8 · J10 · J11
San Benito G1 · G13 · J1
San Bernardino 66
San Diego 680 · S1 · S2 · S3 · S4 · S5 · S6 · S7 · S8 · S9 · S10 · S11 · S12 · S13 · S14 · S15 · S16 · S17 · S21 · S22
San Francisco This county has no routes in the County Signed Route program.
San Joaquin J2 · J3 · J4 · J5 · J6 · J7 · J8 · J9 · J10 · J11 · J12 · J13
San Luis Obispo G14 · G19
San Mateo This county has no routes in the County Signed Route program.
Santa Barbara S20
Santa Clara G2 · G3 · G4 · G5 · G6 · G7 · G8 · G9 · G10 · G21
Santa Cruz G12
Shasta A16 · A17 · A18 · A19 · A20
Sierra A23 · A24
Siskiyou A10 · A12 · A28 · A29
Solano E7
Sonoma C1 · ?1 · ?2 · ?3
Stanislaus J3 · J6 · J7 · J9 · J14 · J16 · J17 · J18 · J59
Sutter This county has no routes in the County Signed Route program.
Tehama A5 · A6 · A7 · A8 · A9 · A11 · A17
Trinity This county has no routes in the County Signed Route program.
Tulare J15 · J19 · J21 · J22 · J23 · J24 · J25 · J26 · J27 · J28 · J29 · J30 · J31 · J32 · J33 · J34 · J35 · J36 · J37 · J38 · J40 · J41 · J42 · J44 · J46
Tuolumne E5 · E15 · E17 · E18 · J20 · J59 · J132
Ventura This county has no routes in the County Signed Route program.
Yolo E4 · E6 · E7 · E8 · E9 · E10 · E11 · E19
Yuba E20 · E21

County Routes by Letter

NORTHERN CALIFORNIA COUNTIES GROUP
Butte · Glenn · Lassen · Modoc · Plumas · Shasta · Siskiyou · Tehama · Trinity
A A1 A2 A3 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23 A24 A25 A26 A27 A28 A29
B B2
NORTHERN COASTAL COUNTIES GROUP
Del Norte · Humboldt · Lake · Marin · Mendocino · Napa · San Francisco · Sonoma
C C1
D D1 D2 D3 D4 D5 D6 D7 D8
SACRAMENTO-MOTHER LODE COUNTIES GROUP
Alpine · Amador · Calavaras · Colusa · El Dorado · Nevada · Placer · Sacramento · Sierra · Solano · Sutter · Tuolumne · Yolo · Yuba
E E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11 E12 E13 E14 E15 E16 E17 E18 E19 E20 E21
F There appear to be no county routes for this letter.
CENTRAL COAST COUNTIES GROUP
Alameda · Contra Costa · Monterey · San Benito · San Mateo · San Luis Obispo · Santa Clara · Santa Cruz
G G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 G13 G14 G15 G16 G17 G18 G19 G20 G21
H There appear to be no county routes for this letter.
SAN JOAQUIN VALLEY COUNTIES GROUP
Fresno · Kern · Kings · Madera · Mariposa · Merced · San Joaquin · Stanislaus · Tulare
J J1 J2 J3 J4 J5 J6 J7 J8 J9 J10 J11 J12 J13 J14 J15 J16 J17 J18 J19 J20 J21 J22 J23 J24 J25 J26 J27 J28 J29 J30 J31 J32 J33 J34 J35 J36 J37 J38 J40 J41 J42 J44 J46 J59 J132
K There appear to be no county routes for this letter.
L There appear to be no county routes for this letter.
SOUTHERN AND INLAND EMPIRE COUNTIES GROUP
Imperial · Inyo · Los Angeles · Mono · Orange · Riverside · San Bernardino · San Diego · Santa Barbara · Ventura
N N1 N2 N3 N4 N5 N6 N7 N8 N9
P There appear to be no county routes for this letter.
R R2 R3
S S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 S22 S24 S25 S26 S27 S28 S29 S30 S31 S32 S33 S34 S78 S80
ROUTES NOT IN THE COUNTY ROUTE MARKER PROGRAM, SPECIAL NUMBERS, OR NOT OTHERWISE IDENTIFIED
# Lake: 145 · 502 · 505 · 515
San Bernardino: 66
San Diego: 680
?  · ?1 · ?2 · ?3 · ?4

For each route, information is given in the following categories:

Routing Routing. The route of the county highway, as best can be determined.
History and Signage Information Highway History. General historial information about the route number and its use (or previous uses).
Status Current Status. Current status of the route. This gives information about construction, signage, and specific routing notes. It also provides meta-information; i.e., information about the routing information.
Commuter Lanes HOV (High Occupancy Vehicle) Lane Information. Information about any commuter lanes constructed, or whose construction is planned, along this route.


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©1997-2004 Daniel P. Faigin.
Maintained by: Daniel P. Faigin <webmaster@cahighways.org>.
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