26 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 62704 | Springfield | 40,046 |
| 62702 | Springfield | 31,033 |
| 62703 | Springfield | 28,922 |
| 62711 | Springfield | 18,559 |
| 62629 | Chatham | 15,413 |
| 62712 | Springfield | 10,045 |
| 62707 | Springfield | 7,472 |
| 62563 | Rochester | 5,766 |
| 62684 | Sherman | 5,760 |
| 62615 | Auburn | 5,198 |
| 62561 | Riverton | 4,842 |
| 62558 | Pawnee | 3,639 |
| 62670 | New Berlin | 2,682 |
| 62677 | Pleasant Plains | 2,149 |
| 62693 | Williamsville | 1,677 |
| 62520 | Dawson | 1,652 |
| 62530 | Divernon | 1,558 |
| 62539 | Illiopolis | 1,412 |
| 62661 | Loami | 1,212 |
| 62701 | Springfield | 1,205 |
| 62545 | Mechanicsburg | 1,101 |
| 62536 | Glenarm | 1,049 |
| 62625 | Cantrall | 1,003 |
| 62515 | Buffalo | 902 |
| 62689 | Thayer | 542 |
| 62706 | Springfield | 0 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 26 ZCTAs in Sangamon County, Illinois (US Census).