California Department of Education
Includes student demographic and performance data.
County and school district data available.
California Dept. of Health and Human Services
Open Data: Educational Attainment
Includes data by county.
California Office of Environmental Health Hazard Assessment
Includes data by county, city, and Census tract numbers.
An easy-to-use mapping program that includes over 15,000 US demographic and socioeconomic data indicators from the neighborhood census block to national levels. Data may be downloaded to csv.
County data available.
American Community Survey
Educational Attainment Survey/Program: American Community Survey
Years: 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010
Table: S1501: Educational Attainment
Select “Geography” to see breakdown by county.