California State Route 237

State Route 237
Southbay Freeway
SR 237 highlighted in red
Route information
Maintained by Caltrans
Length	11 mi[1] (18 km)
Existed	1934–June 30, 1964 (as SR 9) 1964 renumbering–present
Major junctions
West end	SR 82 in Mountain View
Major intersections	SR 85 in Mountain View US 101 in Sunnyvale I-880 in Milpitas
East end	I-680 in Milpitas
Location
Country	United States
State	California
Counties	Santa Clara
Highway system
State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
← SR 236 → I-238

State Route 237 (SR 237) is a state highway in the U.S. state of California that runs from El Camino Real (SR 82) in Mountain View to Interstate 680 in Milpitas. Known as the Southbay Freeway for most of its length, SR 237 runs south of the San Francisco Bay, connecting the East Bay to the Peninsula.