| Zip Code | City | Population ↓ |
|---|---|---|
| 52302 | Marion | 42,803 |
| 52402 | Cedar Rapids | 42,648 |
| 52404 | Cedar Rapids | 41,433 |
| 52405 | Cedar Rapids | 26,259 |
| 52403 | Cedar Rapids | 24,191 |
| 52411 | Cedar Rapids | 8,242 |
| 52233 | Hiawatha | 7,025 |
| 52314 | Mount Vernon | 6,011 |
| 52213 | Center Point | 3,869 |
| 52228 | Fairfax | 3,656 |
| 52328 | Robins | 2,962 |
| 52227 | Ely | 2,825 |
| 52214 | Central City | 2,790 |
| 52336 | Springville | 2,442 |
| 52401 | Cedar Rapids | 2,172 |
| 52324 | Palo | 2,139 |
| 52352 | Walker | 1,775 |
| 52218 | Coggon | 1,709 |
| 52202 | Alburnett | 1,267 |
| 52341 | Toddville | 1,154 |
| 52219 | Prairieburg | 180 |
| 52344 | Troy Mills | 100 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 22 ZCTAs in Linn County, Iowa (US Census).