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This Quincy and Adams County Illinois zip code map does not show post box zip codes or unique zip
codes. These maps are designed for quick general lookup of census zip code polygon property land ownership areas. The Census
Bureau does not keep up-to-date data-sets of all ZIP codes.
ZIP Code Tabulation Areas (ZCTAsª) are a new statistical entity developed by the U.S. Census Bureau for
tabulating summary statistics from Census 2000. This new entity was developed to overcome the
difficulties in precisely defining the land area covered by each ZIP Code. Defining the extent of an area is
necessary in order to accurately tabulate census data for that area.
ZCTAs are generalized area
representations of U.S. Postal Service (USPS) ZIP Code service areas. Simply put, each one is built by
aggregating the Census 2000 blocks, whose addresses use a given ZIP Code, into a ZCTA which gets that
ZIP Code assigned as its ZCTA code. They represent the majority USPS five-digit ZIP Code found in a given
area. For those areas where it is difficult to determine the prevailing five-digit ZIP Code, the higher-level
three-digit ZIP Code is used for the ZCTA code. Also, Some areas that are in remote regions might have
PO box zip code usage. Source U.S. Census
Many large businesses, commercial shipping companies, insurance companies, sales people, sales
marketers, travelers, trucking companies, lawyers, demographic researchers, delivery & freight
services,Realtors & real estate companies, and citizens needing zip code information use this census
information everyday.
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