26 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 62704 | Springfield | 39,597 |
| 62702 | Springfield | 31,251 |
| 62703 | Springfield | 28,820 |
| 62711 | Springfield | 18,351 |
| 62629 | Chatham | 15,369 |
| 62712 | Springfield | 10,555 |
| 62707 | Springfield | 8,168 |
| 62563 | Rochester | 5,575 |
| 62684 | Sherman | 5,422 |
| 62615 | Auburn | 5,075 |
| 62561 | Riverton | 4,927 |
| 62558 | Pawnee | 3,585 |
| 62670 | New Berlin | 2,695 |
| 62677 | Pleasant Plains | 2,153 |
| 62693 | Williamsville | 1,871 |
| 62530 | Divernon | 1,538 |
| 62520 | Dawson | 1,453 |
| 62661 | Loami | 1,360 |
| 62539 | Illiopolis | 1,342 |
| 62545 | Mechanicsburg | 1,306 |
| 62701 | Springfield | 1,211 |
| 62515 | Buffalo | 1,005 |
| 62536 | Glenarm | 993 |
| 62625 | Cantrall | 897 |
| 62689 | Thayer | 627 |
| 62706 | Springfield | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 26 ZCTAs in Sangamon County, Illinois (US Census).