Cerro Gordo County, IA ZIP codes
There are 10 ZIP codes in Cerro Gordo County, IA, in 9 towns, from 50401 to 50482. The largest are 50401 (Mason City), 50428 (Clear Lake) and 50469 (Rockwell).
The county seat is Mason City.
- ZIP codes
- 10
- Towns
- 9
- County seat
- Mason City
- County FIPS
19033- State
- Iowa
- Population
- 42,632
- Median household income
- $68,189
- Land area
- 568 sq mi
- Area code
- 641
- Metro area
- Mason City
Cerro Gordo County ZIP codes by town
- Mason City (county seat)
- 50401, 50402
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
Map of Cerro Gordo County ZIP codes
The ZIP codes of Cerro Gordo County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Cerro Gordo County in numbers
About 42,632 people live in Cerro Gordo County, in 19,538 households, the 13th most populous of Iowa's 99 counties. The median household income is $68,189 a year, 9% below the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $166,400 (20% below the Iowa median), and median gross rent is $850 a month. The median age is 44.0; 24.0% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 16 minutes.
| Population | 42,632 |
|---|---|
| Households | 19,538 |
| Median age | 44.0 |
| Median household income | $68,189 |
| Median home value | $166,400 |
| Median gross rent | $850 |
| Bachelor's degree or higher | 24.0% |
| Mean commute | 15.6 min |
| Population density | 75 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Cerro Gordo County
| Town | ZIP codes | Population |
|---|---|---|
| Mason City | 2 | 27,050 |
| Clear Lake | 1 | 7,607 |
| Rockwell | 1 | 986 |
| Ventura | 1 | 733 |
| Thornton | 1 | 514 |
| Plymouth | 1 | 407 |
| Swaledale | 1 | 148 |
| Rock Falls | 1 | 119 |
| Dougherty | 1 | 88 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Cerro Gordo County.
- Floyd County (7)
- Butler County (11)
- Wright County (9)
- Hancock County (9)
- Mitchell County (8)
- Franklin County (11)
- Worth County (7)
Not sure you are in Cerro Gordo County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Cerro Gordo County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
50401 | Mason City , IA | Standard | 28,703 | $66,072 | $146,500 |
50402 | Mason City , IA | No street area | — | — | — |
50428 | Clear Lake , IA | Standard | 9,071 | $81,037 | $283,400 |
50433 | Dougherty , IA | Standard | 157 | $69,167 | $86,300 |
50464 | Plymouth , IA | Standard | 694 | $91,750 | $197,100 |
50467 | Rock Falls , IA | Standard | 63 | $63,750 | $150,000 |
50469 | Rockwell , IA | Standard | 1,527 | $71,250 | $211,700 |
50477 | Swaledale , IA | Standard | 250 | $52,321 | $83,000 |
50479 | Thornton , IA | Standard | 655 | $68,750 | $121,100 |
50482 | Ventura , IA | Standard | 748 | $98,289 | $238,000 |
Cite this page
zipcodes.pro. “Cerro Gordo County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ia/county/cerro-gordo
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