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The DOTS Address Geocode operation called GetGeoLocation returns block and tract information for some addresses.
Latitude, longitude, block and tract calculations are based on the 2007 TIGER/Line data set provided by the Census Bureau's TIGER Mapping Service.
Example Output:
<Latitude>34.421556</Latitude>
<Longitude>-119.697222</Longitude>
<Zip>93101-2247</Zip>
<Tract>0009.00</Tract>
<Block>2004</Block>
Census tracts are small, relatively permanent statistical subdivisions of a county. Census tracts are delineated for most metropolitan areas (MA's) and other densely populated counties by local census statistical areas committees following Census Bureau guidelines (more than 3,000 census tracts have been established in 221 counties outside MA's). Six States (California, Connecticut, Delaware, Hawaii, New Jersey, and Rhode Island) and the District of Columbia are covered entirely by census tracts. Census tracts usually have between 2,500 and 8,000 persons and, when first delineated, are designed to be homogeneous with respect to population characteristics, economic status, and living conditions. Census tracts do not cross county boundaries.
The spatial size of census tracts varies widely depending on the density of settlement. Census tract boundaries are delineated with the intention of being maintained over a long time so that statistical comparisons can be made from census to census. However, physical changes in street patterns caused by highway construction, new development, etc., may require occasional revisions; census tracts occasionally are split due to large population growth, or combined as a result of substantial population decline. Block numbering areas (BNA's) are small statistical subdivisions of a county for grouping and numbering blocks in non-metropolitan counties where local census statistical area committees have not established census tracts.
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