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DataFinder from the Population Reference Bureau
A database with hundreds of variables for the US and the world.
Public use microdata from the U. S. census and American Community Survey; the U.S. Current Population Survey; and international censuses. Data can be downloaded or analyzed online.
1790-2010+. Data from the decennial Census and the American Community Survey, with a user-friendly interface. Allows the creation of maps & statistical tables. Census Tract boundaries are available back to 1940. Also includes religion surveys from 1980-2010, which are not affiliated with the U.S. Census. (Note: this database has a limit of 5 simultaneous users.)
SimplyAnalytics is a web-based mapping application that lets users quickly create professional-quality thematic maps and reports using demographic, business, and marketing data for the United States. Access limited to 5 simultaneous users. Try again later if refused. Includes EASI/MediaMark Research Incorporated (MRI) data package. (formerly known as SimplyMap).
San Diego County Statistics
California State Statistics