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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).
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.
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.