Grundy County, IA ZIP codes
There are 9 ZIP codes in Grundy County, IA, in 9 towns, from 50609 to 50680. The largest are 50638 (Grundy Center), 50669 (Reinbeck) and 50624 (Dike). 1 more crosses into it from a neighbouring county: 50665.
The county seat is Grundy Center.
- ZIP codes
- 9
- Partly in it
- 1 more
- Towns
- 9
- County seat
- Grundy Center
- County FIPS
19075- State
- Iowa
- Population
- 12,384
- Median household income
- $87,205
- Land area
- 502 sq mi
- Metro area
- Waterloo-Cedar Falls
Grundy County ZIP codes by town
- Grundy Center (county seat)
- 50638
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 Grundy County
This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Grundy County.
- 50665 Parkersburg · mostly in Butler County
Map of Grundy County ZIP codes
The ZIP codes of Grundy 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.
Grundy County in numbers
About 12,384 people live in Grundy County, in 5,117 households, the 60th most populous of Iowa's 99 counties. The median household income is $87,205 a year, 16% above the Iowa median of $75,059 (US: $80,734). The median owner-occupied home is valued at $198,800 (4% below the Iowa median), and median gross rent is $774 a month. The median age is 41.9; 27.8% of adults 25 and over hold a bachelor's degree or higher (31.4% across Iowa); the average commute takes 24 minutes.
| Population | 12,384 |
|---|---|
| Households | 5,117 |
| Median age | 41.9 |
| Median household income | $87,205 |
| Median home value | $198,800 |
| Median gross rent | $774 |
| Bachelor's degree or higher | 27.8% |
| Mean commute | 23.5 min |
| Population density | 25 / 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 Grundy County
| Town | ZIP codes | Population |
|---|---|---|
| Grundy Center | 1 | 2,809 |
| Reinbeck | 1 | 1,715 |
| Dike | 1 | 1,365 |
| Conrad | 1 | 1,191 |
| Wellsburg | 1 | 673 |
| Holland | 1 | 327 |
| Stout | 1 | 296 |
| Beaman | 1 | 125 |
| Morrison | 1 | 96 |
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 Grundy County.
- Black Hawk County (14)
- Marshall County (13)
- Tama County (12)
- Hardin County (12)
- Butler County (11)
- Franklin County (11)
Not sure you are in Grundy County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Grundy County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
50609 | Beaman , IA | Standard | 377 | $90,250 | $241,700 |
50621 | Conrad , IA | Standard | 1,601 | $88,077 | $214,700 |
50624 | Dike , IA | Standard | 1,855 | $96,713 | $260,100 |
50638 | Grundy Center , IA | Standard | 3,441 | $85,223 | $185,200 |
50642 | Holland , IA | Standard | 577 | $108,750 | $178,900 |
50657 | Morrison , IA | Standard | 96 | $66,250 | $95,000 |
50669 | Reinbeck , IA | Standard | 2,439 | $81,650 | $183,000 |
50673 | Stout , IA | Standard | 250 | $66,875 | $122,300 |
50680 | Wellsburg , IA | Standard | 1,027 | $75,956 | $140,900 |
Cite this page
zipcodes.pro. “Grundy County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ia/county/grundy
Underlying data is public domain or openly licensed — sources, vintages and licences.