ZIP CodesZIP codes in Chickasaw County, Iowa
Chickasaw County, Iowa has 7 ZIP codes in this list, from 50603 to 52154. They cover 7 places, among them Alta Vista, Fredericksburg, Ionia and Nashua.
| ZIP code | Place | Land area (sq mi) | Map point |
|---|---|---|---|
| 50603 | Alta Vista | 45.1 | 43.148, -92.424 |
| 50630 | Fredericksburg | 84.0 | 42.959, -92.198 |
| 50645 | Ionia | 85.6 | 43.040, -92.487 |
| 50658 | Nashua | 78.0 | 42.953, -92.530 |
| 50659 | New Hampton | 153 | 43.056, -92.313 |
| 50661 | North Washington | no area | 43.117, -92.414 |
| 52154 | Lawler | 72.8 | 43.093, -92.144 |
The ZIP code areas of Chickasaw County add up to about 518 square miles of land (1,343 sq km) as the Census Bureau draws them. The largest is 50659 (New Hampton), with 153 square miles.
Using these codes
- In an address, the ZIP code comes last, after the city and the two-letter state: Alta Vista, IA 50603.
- Tap a ZIP code to open it in the look-up, with a copy button for the address line.
- A code can cross a county line, and one town can have several codes. The table shows the main place of each code.
- "No area" means the Census Bureau draws no area for that code. Such codes are usually for post office boxes or a single building.
Places and counties: GeoNames. Areas: U.S. Census Bureau, 2024 ZIP Code Tabulation Areas. Checked in November 2026. This site is not connected with the United States Postal Service; for mailing, confirm the address with USPS.