| Zip Code | City | Population ↓ |
|---|---|---|
| 61761 | Normal | 53,423 |
| 61704 | Bloomington | 37,517 |
| 61701 | Bloomington | 35,480 |
| 61705 | Bloomington | 12,746 |
| 61745 | Heyworth | 4,507 |
| 61752 | Le Roy | 4,461 |
| 61753 | Lexington | 3,279 |
| 61748 | Hudson | 2,732 |
| 61736 | Downs | 2,578 |
| 61726 | Chenoa | 2,508 |
| 61732 | Danvers | 2,017 |
| 61744 | Gridley | 1,506 |
| 61776 | Towanda | 1,321 |
| 61728 | Colfax | 1,301 |
| 61770 | Saybrook | 1,146 |
| 61754 | McLean | 1,107 |
| 61774 | Stanford | 836 |
| 61722 | Arrowsmith | 701 |
| 61737 | Ellsworth | 444 |
| 61724 | Bellflower | 439 |
| 61730 | Cooksville | 369 |
| 61720 | Anchor | 319 |
| 61772 | Shirley | 252 |
| 61731 | Cropsey | 145 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 24 ZCTAs in McLean County, Illinois (US Census).