Martinez is a city and the county seat of Contra Costa County, California, United States. The population was 35,824 at the 2010 census. The downtown is notable for its large number of preserved old buildings. Martinez is located on the south side of the Carquinez Strait in the San Francisco Bay Area, directly facing the city of Benicia.
Covering most of Martinez, the Martinez Unified School District encompasses four elementary schools, one middle school, one high school, and two alternative/independent study schools.
Students in K-5 attend John Swett, John Muir, Las Juntas, or Morello Park Elementary School. Martinez Junior High School serves students in grades 6 through 8. St. Catherine of Siena is a private Catholic school that serves grades K-8. Alhambra High School serves as the districts’ comprehensive high school. As of 2006, the districts’ K-12 enrollment was 4,194. Part of Martinez is served by the Mount Diablo Unified School District, whose Hidden Valley Elementary School is located in Martinez. St. Catherine of Siena School (Martinez, California), a private Roman Catholic elementary, also serves the Martinez community.