There are 16 zip codes in Adams County, Illinois. The most populated is 62301, located in Quincy. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
62301Quincy30,944
62305Quincy19,473
62320Camp Point2,557
62347Liberty1,999
62351Mendon1,934
62360Payson1,898
62324Clayton1,398
62376Ursa1,106
62338Fowler1,010
62339Golden1,005
62349Loraine680
62325Coatsburg471
62365Plainville406
62348Lima219
62346La Prairie128
62359Paloma126

Adams County, Illinois Zip Codes by Population (2024)