United States Census: Online and Print sources for the United States Census: A note about Census Geography

Census Geography: (state, county, tract, block-group, block). Note: Data is also aggregated for "place" (cities and towns) and other political/administrative divisions such as census county divisions (ccd),municipal civil divisions (mcd), school districts, zipcode tabulation areas, etc.

Please Note: Many statistics are collected only through a sample count. In addition, some data is suppressed for very small geographic areas, e.g. census blocks, to protect individual privacy.

See also: CAPS Circular Area Profiling System (Census 2000, 2010 and ACS counts), from the Missouri Census Data Center.
NOTE: data for small radii (< 3 miles) are subject to substantial sampling error, especially in sparsely-populated rural areas.