This Mount Carroll and Carroll County Illinois zip code (zcta) 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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