Washington County, IA ZIP codes
There are 7 ZIP codes in Washington County, IA, in 7 towns, from 52201 to 52621. The largest are 52353 (Washington), 52327 (Riverside) and 52356 (Wellman). 2 more cross into it from neighbouring counties: 52247 and 52540.
The county seat is Washington.
- ZIP codes
- 7
- Partly in it
- 2 more
- Towns
- 7
- County seat
- Washington
- County FIPS
19183- State
- Iowa
- Population
- 22,561
- Median household income
- $75,647
- Land area
- 569 sq mi
- Metro area
- Iowa City
Washington County ZIP codes by town
- Washington (county seat)
- 52353
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 Washington County
These ZIP codes lie mostly in a neighbouring county but each cover a twentieth or more of Washington County.
- 52247 Kalona · mostly in Johnson County
- 52540 Brighton · mostly in Jefferson County
Map of Washington County ZIP codes
The ZIP codes of Washington 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.
Washington County in numbers
About 22,561 people live in Washington County, in 8,972 households, the 27th most populous of Iowa's 99 counties. The median household income is $75,647 a year, about the same as the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $203,900 (about the same as the Iowa median), and median gross rent is $879 a month. The median age is 40.7; 26.2% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 24 minutes.
| Population | 22,561 |
|---|---|
| Households | 8,972 |
| Median age | 40.7 |
| Median household income | $75,647 |
| Median home value | $203,900 |
| Median gross rent | $879 |
| Bachelor's degree or higher | 26.2% |
| Mean commute | 23.5 min |
| Population density | 40 / 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 Washington County
| Town | ZIP codes | Population |
|---|---|---|
| Washington | 1 | 7,290 |
| Wellman | 1 | 1,454 |
| Keota | 1 | 891 |
| Riverside | 1 | 890 |
| Ainsworth | 1 | 633 |
| Crawfordsville | 1 | 312 |
| West Chester | 1 | 178 |
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 Washington County.
- Johnson County (15)
- Henry County (9)
- Iowa County (13)
- Jefferson County (7)
- Louisa County (6)
- Keokuk County (14)
Not sure you are in Washington County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Washington County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
52201 | Ainsworth , IA | Standard | 1,148 | $93,750 | $181,600 |
52248 | Keota , IA | Standard | 1,675 | $77,174 | $157,000 |
52327 | Riverside , IA | Standard | 3,796 | $86,942 | $298,800 |
52353 | Washington , IA | Standard | 9,241 | $63,047 | $160,500 |
52356 | Wellman , IA | Standard | 2,664 | $57,321 | $227,800 |
52359 | West Chester , IA | Standard | 308 | $67,727 | — |
52621 | Crawfordsville , IA | Standard | 604 | $87,188 | $98,200 |
Cite this page
zipcodes.pro. “Washington County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ia/county/washington
Underlying data is public domain or openly licensed — sources, vintages and licences.