| Zip Code | City | Population ↓ |
|---|---|---|
| 62301 | Quincy | 30,944 |
| 62305 | Quincy | 19,473 |
| 62320 | Camp Point | 2,557 |
| 62347 | Liberty | 1,999 |
| 62351 | Mendon | 1,934 |
| 62360 | Payson | 1,898 |
| 62324 | Clayton | 1,398 |
| 62376 | Ursa | 1,106 |
| 62338 | Fowler | 1,010 |
| 62339 | Golden | 1,005 |
| 62349 | Loraine | 680 |
| 62325 | Coatsburg | 471 |
| 62365 | Plainville | 406 |
| 62348 | Lima | 219 |
| 62346 | La Prairie | 128 |
| 62359 | Paloma | 126 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 16 ZCTAs in Adams County, Illinois (US Census).