Santa Clara (Spanish for "Saint Claire" of Assisi) is one of the 58 counties in the state of California. It was created in 1850, making it one of the original 27 counties in the state of California. As of the 2010 census, the population was 1,781,642, up from 1,682,585 in 2000. Santa Clara is the most populous county in northern California. The county seat and largest city is San Jose.
The county has an area of 1,304.01 (3,377.4 km2) square miles, of which 1,290.69 square miles (3,342.9 km2) are land. Santa Clara is bordered on the north by Alameda County, on the east by Stanislaus and Merced counties, on the south by San Benito County, on the southwest by Santa Cruz County and on the northwest by San Mateo County.
Santa Clara is one of the traditional nine Bay Area counties. It is also the center of Silicon Valley, making it the world center for high technology. It is served by Interstates 280, 680 and 880, making it the largest county in the US not served by a two-digit interstate highway.