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Census tracts are polygons and cover a well-defined geographic area. ZIP codes are clusters of lines; the U.S. Postal Service does not define ZIP Code boundaries.Census tracts provide more granularity (73,000 areas) than ZIP Codes (43,000).

A Census tract is roughly the size of a neighborhood, but may not correspond to actual neighborhoods or city boundaries. Census tracts are a useful tool to compare different areas across a city, state or country to one another.

To find a census tract number for a street address, use these look-up tools: The Federal Financial Institutions Examination Council (FFIEC) maintains a look-up system for census tracts at https://geomap.ffiec.gov/FFIECGeocMap/GeocodeMap1.aspx.

A block group is a subdivision of a census tract and contains a cluster of blocks. Block groups usually have between 250 and 550 housing units. A census block is the smallest geographic census unit. Blocks can be bounded by visible featuressuch as streetsor by invisible boundaries, such as city limits.

Block Groups (BGs) are statistical divisions of census tracts, are generally defined to contain between 600 and 3,000 people, and are used to present data and control block numbering.

ZIP Code Tabulation Areas (ZCTAs) are generalized areal representations of United States Postal Service (USPS) ZIP Code service areas. The USPS ZIP Codes identify the individual post office or metropolitan area delivery station associated with mailing addresses.

The block group number will generally be the last geography in the bubble and contain the full 12-digit FIPS code and then the 11-digit census tract code above.