•
U.S. Routes and
Interstate Highways that traverse California are also defined in the California Streets and Highways code as state routes. This list does not include these state routes as they are listed separately. • A few cases exist, such as
SR 110, where a defined California State Route partially overlaps with a federally defined Interstate Highway, while the remaining portion is signed as a state highway. This table only addresses the portion signed as a California State Route in these cases. • Lengths for each state route were initially measured as they existed during the
1964 state highway renumbering (or during the year the route was established, if after 1964), and do not necessarily reflect the current mileage. • The years listed reflect when the route was affected by legislative action, this is not necessarily the same year as the actual construction or signing changes to the route. Most notably,
SR 275 was deleted from the Streets and Highways Code in 1996, but remained partially maintained until it was added back in 2010; and
SR 42 was signed as such for over 30 years after it was redesignated as
105. •
Concurrencies are not explicitly codified in the Streets and Highways Code; such highway segments are listed on only one of the corresponding legislative route numbers. For example, the
I-80/
I-580 concurrency, known as the
Eastshore Freeway, is only listed under Route 80 in the highway code while the definition of Route 580 is broken into non-contiguous segments. When a highway is broken into such segments, the total length recorded by Caltrans only reflects those non-contiguous segments and does not include those overlaps that would be required to make the route continuous. Furthermore, Caltrans may not sign all concurrencies, and instead may only post the highway shields for the route with the contiguous segment in the code. • Some highways are not contiguous as the state has relinquished control of small sections to local governments. The stated length of the highway may or may not reflect the portions under local control. • For simplicity, the termini columns below only list each route's overall end points, and do not include relinquished or unconstructed gaps.
Top 10 longest routes File:Bixby Creek Bridge, California, USA - May 2013.jpg|alt=Photograph|The
Bixby Creek Bridge in
Big Sur on SR 1 File:San Joaquin River Viaduct aerial 2016.jpg|SR 99 crossing the
San Joaquin River at the
Fresno–
Madera county line File:Fall River pic 1.JPG|SR 299 in
Fall River Mills File:CalifSR49AmerMF.JPG|alt=Photograph|SR 49 crossing the
American River North/Middle Fork, as seen from
Foresthill Bridge File:CA33 oil derricks.JPG|SR 33 in
Kern County File:ChesterCA1.jpg|SR 36 through
Chester File:Emerald Bay State Park - panoramio (4).jpg|alt=Photograph|SR 89 through
Emerald Bay State Park overlooking
Lake Tahoe File:Antelope valley californie.jpg|A truck on SR 58 just north of
Edwards Air Force Base File:CA 78 Anza-Borrego.jpg|alt=Photograph|SR 78 eastbound in
Anza-Borrego Desert State Park File:CA20 Colusa County.JPG|SR 20 in
Colusa County ==Special routes==