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It includes over 60,000 census tracts and over 40,000 ZIP Codes, and there are multiple lines for many of the census tracts, resulting in a 22 MB Excel file with 25 columns and 148,898 rows. There is a single, really big CSV file for viewing the relationships between ZIP Codes and census tracts for the entire United States. Simply put, each ZCTA is built by aggregating 2010 Census blocks, whose addresses use a given ZIP Code." They represent the most frequently occurring five-digit ZIP Code found in a given area. Postal Service ( USPS) ZIP Code service areas. ZIP Code Tabulation Areas (ZCTAs) "are generalized area representations of U.S. If the population grows in census tract 211 so that it is subdivided into three parts and the redrawn census boundaries incorporate part of census tract 183, then 183 and 211 disappear and the new tracts are 183.01, 211.01, 211.02, and 211.03 however, census tract 183 might not be renumbered if the change in its boundary was minor.If census tract 116 is divided in half then 116 disappears and the new parts become 116.01 and 116.02.

If the boundaries of a census tract change then the tract number changes as well. Understandable boundary changes - Changes in ZIP Codes may make it difficult to determine whether a change in a data value over time is due to actual changes in the population or because lines were redrawn.Postal Service adjusts to maintain efficient delivery zones. Some changes in ZIP Codes may occur monthly as areas grow and the U.S. Less frequent boundary changes - Census tracts tend to be stable for 10 years or more.More complete coverage - Collectively census tracts describe the entire U.S., even remote areas ZIP Codes cover most of the U.S., but not areas where mail delivery is not available.Standard aggregation of data - each of the following groups cleanly aggregates into the next group in the chain:īlocks -> block groups -> census tracts -> counties -> states -> nation.ZIP Codes frequently cross city and county boundaries in 2010 there were at least 103 ZIP Codes which crossed state lines. Better aggregation of geographic boundaries for comparisons with municipal and county data - Census tracts do not cross county lines and typically break out data for incorporated places.