Calhoun County, IA ZIP codes
There are 10 ZIP codes in Calhoun County, IA, in 10 towns, from 50538 to 51453. The largest are 50563 (Manson), 50579 (Rockwell City) and 51449 (Lake City).
The county seat is Rockwell City.
- ZIP codes
- 10
- Towns
- 10
- County seat
- Rockwell City
- County FIPS
19025- State
- Iowa
- Population
- 9,803
- Median household income
- $64,964
- Land area
- 570 sq mi
Calhoun County ZIP codes by town
- Rockwell City (county seat)
- 50579
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 Calhoun County ZIP codes
The ZIP codes of Calhoun 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.
Calhoun County in numbers
About 9,803 people live in Calhoun County, in 3,993 households, the 75th most populous of Iowa's 99 counties. The median household income is $64,964 a year, 13% below the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $118,800 (43% below the Iowa median), and median gross rent is $723 a month. The median age is 42.8; 21.8% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 22 minutes.
| Population | 9,803 |
|---|---|
| Households | 3,993 |
| Median age | 42.8 |
| Median household income | $64,964 |
| Median home value | $118,800 |
| Median gross rent | $723 |
| Bachelor's degree or higher | 21.8% |
| Mean commute | 22.3 min |
| Population density | 17 / 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 Calhoun County
| Town | ZIP codes | Population |
|---|---|---|
| Rockwell City | 1 | 2,401 |
| Lake City | 1 | 1,693 |
| Manson | 1 | 1,645 |
| Pomeroy | 1 | 542 |
| Farnhamville | 1 | 386 |
| Lytton | 1 | 357 |
| Lohrville | 1 | 277 |
| Somers | 1 | 149 |
| Knierim | 1 | 76 |
| Jolley | 1 | 19 |
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 Calhoun County.
Not sure you are in Calhoun County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Calhoun County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
50538 | Farnhamville , IA | Standard | 661 | $62,344 | $94,000 |
50551 | Jolley , IA | Standard | 96 | — | $51,100 |
50552 | Knierim , IA | Standard | 76 | $89,000 | $112,500 |
50561 | Lytton , IA | Standard | 585 | $67,446 | $77,800 |
50563 | Manson , IA | Standard | 2,505 | $71,094 | $161,100 |
50575 | Pomeroy , IA | Standard | 696 | $52,717 | $88,900 |
50579 | Rockwell City , IA | Standard | 3,034 | $61,108 | $126,000 |
50586 | Somers , IA | Standard | 272 | $55,375 | $89,100 |
51449 | Lake City , IA | Standard | 1,950 | $75,329 | $115,800 |
51453 | Lohrville , IA | Standard | 500 | $86,563 | $78,800 |
Cite this page
zipcodes.pro. “Calhoun County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ia/county/calhoun
Underlying data is public domain or openly licensed — sources, vintages and licences.