Chickasaw County, IA ZIP codes
There are 7 ZIP codes in Chickasaw County, IA, in 7 towns, from 50603 to 52154. The largest are 50659 (New Hampton), 50658 (Nashua) and 50630 (Fredericksburg). 1 more crosses into it from a neighbouring county: 52171.
The county seat is New Hampton.
- ZIP codes
- 7
- Partly in it
- 1 more
- Towns
- 7
- County seat
- New Hampton
- County FIPS
19037- State
- Iowa
- Population
- 11,807
- Median household income
- $75,675
- Land area
- 504 sq mi
Chickasaw County ZIP codes by town
- New Hampton (county seat)
- 50659
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.
ZIP codes partly in Chickasaw County
This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Chickasaw County.
- 52171 Waucoma · mostly in Fayette County
Map of Chickasaw County ZIP codes
The ZIP codes of Chickasaw 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.
Chickasaw County in numbers
About 11,807 people live in Chickasaw County, in 4,997 households, the 64th most populous of Iowa's 99 counties. The median household income is $75,675 a year, about the same as the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $182,600 (12% below the Iowa median), and median gross rent is $738 a month. The median age is 43.1; 21.2% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 19 minutes.
| Population | 11,807 |
|---|---|
| Households | 4,997 |
| Median age | 43.1 |
| Median household income | $75,675 |
| Median home value | $182,600 |
| Median gross rent | $738 |
| Bachelor's degree or higher | 21.2% |
| Mean commute | 19.4 min |
| Population density | 23 / 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 Chickasaw County
| Town | ZIP codes | Population |
|---|---|---|
| New Hampton | 1 | 3,453 |
| Nashua | 1 | 1,622 |
| Fredericksburg | 1 | 989 |
| Lawler | 1 | 363 |
| Ionia | 1 | 336 |
| Alta Vista | 1 | 194 |
| North Washington | 1 | 134 |
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 Chickasaw County.
- Bremer County (8)
- Winneshiek County (8)
- Fayette County (15)
- Floyd County (7)
- Butler County (11)
- Howard County (6)
Not sure you are in Chickasaw County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Chickasaw County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
50603 | Alta Vista , IA | Standard | 555 | $74,271 | $122,700 |
50630 | Fredericksburg , IA | Standard | 1,372 | $71,518 | $198,900 |
50645 | Ionia , IA | Standard | 1,193 | $64,408 | $114,600 |
50658 | Nashua , IA | Standard | 2,450 | $71,936 | $155,100 |
50659 | New Hampton , IA | Standard | 5,688 | $78,153 | $206,900 |
50661 | North Washington , IA | No street area | — | — | — |
52154 | Lawler , IA | Standard | 592 | $58,393 | $156,100 |
Cite this page
zipcodes.pro. “Chickasaw County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ia/county/chickasaw
Underlying data is public domain or openly licensed — sources, vintages and licences.