State Route 21 (SR 21) is a short highway located in the state of California. It runs for approximately 5 miles, connecting the city of Sacramento to Interstate 80. The route primarily serves as a local connector, facilitating access to various neighborhoods and commercial areas. The highway is also known for its scenic views, as it passes through both urban and suburban landscapes. SR 21 is an important route for commuters and travelers, providing a convenient option for those navigating the region. It is maintained by the California Department of Transportation.