Cerro Gordo County, Iowa ZIP codes
10 ZIP codes are in Cerro Gordo County, plus 8 that cross in from neighboring counties. It's part of the Mason City, IA micro area.
- ZIP codes
- 10
- Population in these ZIPs
- 41,868
- Avg. median income
- $70,500population-weighted
- Cities & towns
- 9
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Cerro Gordo County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 50401 | Mason City | 28,703 | $66,072 | $160,300 |
| 50402 PO Box | Mason City | — | — | — |
| 50428 | Clear Lake | 9,071 | $81,037 | $339,500 |
| 50433 | Dougherty | 157 | $69,167 | $227,400 |
| 50464 | Plymouth | 694 | $91,750 | $199,400 |
| 50467 | Rock Falls | 63 | $63,750 | $150,000 |
| 50469 | Rockwell | 1,527 | $71,250 | $213,600 |
| 50477 | Swaledale | 250 | $52,321 | $83,000 |
| 50479 | Thornton | 655 | $68,750 | $158,600 |
| 50482 | Ventura | 748 | $98,289 | $321,800 |
ZIP codes partly in Cerro Gordo County
These ZIP codes are mostly in a neighboring county but cover part of Cerro Gordo County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 50434 | Fertile | Worth County | 396 | — | $179,400 |
| 50444 | Hanlontown | Worth County | 394 | $78,214 | $208,500 |
| 50449 | Klemme | Hancock County | 785 | $59,524 | $108,100 |
| 50456 | Manly | Worth County | 1,699 | $81,339 | $152,800 |
| 50457 | Meservey | Hancock County | 463 | $47,250 | $101,600 |
| 50458 | Nora Springs | Floyd County | 2,094 | $99,643 | $194,500 |
| 50468 | Rockford | Floyd County | 1,617 | $73,403 | $207,300 |
| 50475 | Sheffield | Franklin County | 1,446 | $70,938 | $181,900 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Cerro Gordo County
Nearby counties
Frequently asked questions
How many ZIP codes are in Cerro Gordo County, Iowa?
10 ZIP codes are mainly in Cerro Gordo County, and 8 more ZIP codes from neighboring areas reach partly into it.
What cities are in Cerro Gordo County?
ZIP codes in Cerro Gordo County use the city names Clear Lake, Dougherty, Mason City, Plymouth, Rock Falls, Rockwell, Swaledale, Thornton and Ventura.
What metro area is Cerro Gordo County in?
Cerro Gordo County is part of the Mason City, IA micropolitan statistical area.