16 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 62301 | Quincy | 30,746 |
| 62305 | Quincy | 19,036 |
| 62320 | Camp Point | 2,667 |
| 62347 | Liberty | 1,977 |
| 62351 | Mendon | 1,928 |
| 62360 | Payson | 1,605 |
| 62376 | Ursa | 1,276 |
| 62324 | Clayton | 1,196 |
| 62338 | Fowler | 1,075 |
| 62339 | Golden | 970 |
| 62349 | Loraine | 517 |
| 62325 | Coatsburg | 465 |
| 62365 | Plainville | 464 |
| 62348 | Lima | 204 |
| 62359 | Paloma | 184 |
| 62346 | La Prairie | 164 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 16 ZCTAs in Adams County, Illinois (US Census).