Buchanan County, IA ZIP codes
There are 10 ZIP codes in Buchanan County, IA, in 10 towns, from 50607 to 52329. The largest are 50644 (Independence), 50629 (Fairbank) and 50682 (Winthrop). 2 more cross into it from neighbouring counties: 50648 and 52352.
The county seat is Independence.
- ZIP codes
- 10
- Partly in it
- 2 more
- Towns
- 10
- County seat
- Independence
- County FIPS
19019- State
- Iowa
- Population
- 20,694
- Median household income
- $78,236
- Land area
- 571 sq mi
Buchanan County ZIP codes by town
- Independence (county seat)
- 50644
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 Buchanan County
These ZIP codes lie mostly in a neighbouring county but each cover a twentieth or more of Buchanan County.
- 50648 Jesup · mostly in Black Hawk County
- 52352 Walker · mostly in Linn County
Map of Buchanan County ZIP codes
The ZIP codes of Buchanan 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.
Buchanan County in numbers
About 20,694 people live in Buchanan County, in 8,252 households, the 31st most populous of Iowa's 99 counties. The median household income is $78,236 a year, 4% above the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $176,000 (15% below the Iowa median), and median gross rent is $848 a month. The median age is 40.3; 22.4% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 24 minutes.
| Population | 20,694 |
|---|---|
| Households | 8,252 |
| Median age | 40.3 |
| Median household income | $78,236 |
| Median home value | $176,000 |
| Median gross rent | $848 |
| Bachelor's degree or higher | 22.4% |
| Mean commute | 23.5 min |
| Population density | 36 / 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 Buchanan County
| Town | ZIP codes | Population |
|---|---|---|
| Independence | 1 | 6,164 |
| Fairbank | 1 | 1,275 |
| Winthrop | 1 | 1,040 |
| Hazleton | 1 | 720 |
| Quasqueton | 1 | 703 |
| Lamont | 1 | 514 |
| Rowley | 1 | 353 |
| Brandon | 1 | 307 |
| Aurora | 1 | 214 |
| Masonville | 1 | 68 |
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 Buchanan County.
- Linn County (30)
- Black Hawk County (14)
- Benton County (16)
- Bremer County (8)
- Fayette County (15)
- Delaware County (9)
Not sure you are in Buchanan County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Buchanan County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
50607 | Aurora , IA | Standard | 403 | $54,583 | $143,300 |
50629 | Fairbank , IA | Standard | 2,082 | $103,106 | $207,100 |
50641 | Hazleton , IA | Standard | 1,950 | $67,115 | $156,000 |
50644 | Independence , IA | Standard | 8,419 | $80,026 | $186,600 |
50650 | Lamont , IA | Standard | 648 | $57,500 | $120,500 |
50654 | Masonville , IA | Standard | 275 | $53,264 | $124,100 |
50682 | Winthrop , IA | Standard | 1,692 | $89,375 | $183,800 |
52210 | Brandon , IA | Standard | 958 | $70,714 | $157,800 |
52326 | Quasqueton , IA | Standard | 694 | $76,250 | $144,400 |
52329 | Rowley , IA | Standard | 671 | $57,500 | $171,000 |
Cite this page
zipcodes.pro. “Buchanan County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ia/county/buchanan
Underlying data is public domain or openly licensed — sources, vintages and licences.