Grundy County, Iowa ZIP codes
9 ZIP codes are in Grundy County, plus 8 that cross in from neighboring counties. It's part of the Waterloo-Cedar Falls, IA metro area.
- ZIP codes
- 9
- Population in these ZIPs
- 11,663
- Avg. median income
- $86,700population-weighted
- Cities & towns
- 9
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Grundy County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 50609 | Beaman | 377 | $90,250 | $215,800 |
| 50621 | Conrad | 1,601 | $88,077 | $223,300 |
| 50624 | Dike | 1,855 | $96,713 | $301,900 |
| 50638 | Grundy Center | 3,441 | $85,223 | $195,900 |
| 50642 | Holland | 577 | $108,750 | $215,400 |
| 50657 | Morrison | 96 | $66,250 | $95,000 |
| 50669 | Reinbeck | 2,439 | $81,650 | $189,900 |
| 50673 | Stout | 250 | $66,875 | $122,300 |
| 50680 | Wellsburg | 1,027 | $75,956 | $161,300 |
ZIP codes partly in Grundy County
These ZIP codes are mostly in a neighboring county but cover part of Grundy County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 50601 | Ackley | Franklin County | 2,299 | $66,250 | $143,200 |
| 50604 | Aplington | Butler County | 1,590 | $66,776 | $180,600 |
| 50613 | Cedar Falls | Black Hawk County | 43,867 | $78,503 | $265,700 |
| 50627 | Eldora | Hardin County | 3,276 | $74,536 | $129,700 |
| 50643 | Hudson | Black Hawk County | 3,027 | $125,804 | $278,400 |
| 50660 | New Hartford | Butler County | 1,143 | $95,969 | $233,100 |
| 50665 | Parkersburg | Butler County | 2,693 | $75,521 | $245,200 |
| 50672 | Steamboat Rock | Hardin County | 611 | $73,333 | $190,000 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in Grundy County
Nearby counties
Frequently asked questions
How many ZIP codes are in Grundy County, Iowa?
9 ZIP codes are mainly in Grundy County, and 8 more ZIP codes from neighboring areas reach partly into it.
What cities are in Grundy County?
ZIP codes in Grundy County use the city names Beaman, Conrad, Dike, Grundy Center, Holland, Morrison, Reinbeck, Stout and Wellsburg.
What metro area is Grundy County in?
Grundy County is part of the Waterloo-Cedar Falls, IA metropolitan statistical area.