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A ZIP Code (an acronym for Zone Improvement Plan[ 1]) is a system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly [ 2] ( zipping along) when senders use the code in the postal address .
Individual USPS ZIP codes can cross state, place, county, census tract, census block group and census block boundaries, so the Census Bureau asserts that "there is no correlation between ZIP codes and Census Bureau geography". [2] Moreover, the USPS frequently realigns, merges, or splits ZIP codes to meet changing needs.
ZIP Code boundaries often ignore political boundaries, so the appearance of a place name in a mailing address alone does not indicate whether the place is incorporated or unincorporated. Populated place
ZIP Code Tabulation Areas (ZCTAs) in TIGER 2022 represent the 2020 Census definitions. New England City and Town Areas (NECTA) were discontinued under the 2020 standards for delineating Core Based Statistical Areas. County names and codes in Connecticut were replaced with county-equivalent entities that align with state planning regions.
There are generally two widely accepted versions of a postal code: a ZIP code and a ZIP + 4 code. Established in 1963, ZIP codes are the most common and recognizable postal code used by the USPS.
ZCTAs are approximations of United States Postal Service (USPS) 5-digit ZIP Code service areas that the Census Bureau creates using census blocks to present statistical data from censuses and surveys. The ZCTA locale assignments are based on NCES locale boundaries and reflect the locale that accounts for the largest areal proportion of the ZCTA.
1.0 ZIP Code Tabulation Area (ZCTA) locale assignments. The ZCTA Locale file is a table of NCES Locale assignments applied to each of the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs) included in the 2016 TIGER/Line boundaries. The assignments rely on 2016 NCES Locale boundaries and are based on the locale that accounts for the largest ...
In the original lineup, some post offices in Kentucky had ZIP Codes that were not located with in the boundaries of their respective prefixes. The only existing example of this is Closplint, whose ZIP code is 40927, even though it is located in Harlan County, which is under the 408 prefix.