Adams County, Illinois Zip Codes by Population (2024)
The most populated Zip Code in Adams County, Illinois is 62301, located in Quincy. * 2024 populations estimated based on the latest ACS 5-year data.
| Quincy | 30,944 |
| Quincy | 19,473 |
| Camp Point | 2,557 |
| Liberty | 1,999 |
| Mendon | 1,934 |
| Payson | 1,898 |
| Clayton | 1,398 |
| Ursa | 1,106 |
| Fowler | 1,010 |
| Golden | 1,005 |
| Loraine | 680 |
| Coatsburg | 471 |
| Plainville | 406 |
| Lima | 219 |
| La Prairie | 128 |
| Paloma | 126 |