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The California Statistics section of the RAND California database provides statistical tables on business and economics, population and demographics, education, health, government finance, politics, and public opinion.
Provides data down to the census block level, or combine census blocks (or zip codes or tracks...) to create your own area of analysis. Access to the database is limited to 10 users (if you have trouble accessing it, wait a few minutes and try again).
This online tutorial is for
respondents, data users, and others who want basic information on the
American Community Survey. The tutorial has lessons on the purpose and
benefits of the ACS and shows how to access a variety of data products
and resources. There are five separate sections that together take about
an hour to complete.