Clay County, Iowa ZIP codes
10 ZIP codes are in Clay County, plus 7 that cross in from neighboring counties. It's part of the Spencer, IA micro area.
- ZIP codes
- 10
- Population in these ZIPs
- 16,420
- Avg. median income
- $66,400population-weighted
- Cities & towns
- 10
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in Clay County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 51033 | Linn Grove | 421 | $60,625 | $200,700 |
| 51047 | Peterson | 693 | $101,000 | $168,200 |
| 51301 | Spencer | 12,638 | $63,402 | $198,900 |
| 51333 | Dickens | 374 | $110,833 | $242,900 |
| 51338 | Everly | 852 | $57,500 | $164,600 |
| 51340 | Fostoria | 75 | $90,250 | $146,200 |
| 51341 | Gillett Grove | 40 | — | $61,000 |
| 51343 | Greenville | 172 | $60,625 | $174,900 |
| 51357 | Royal | 910 | $68,333 | $131,700 |
| 51366 | Webb | 245 | $87,500 | $189,900 |
ZIP codes partly in Clay County
These ZIP codes are mostly in a neighboring county but cover part of Clay County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 50515 | Ayrshire | Palo Alto County | 251 | $63,333 | $137,700 |
| 50565 | Marathon | Buena Vista County | 380 | $51,875 | $107,900 |
| 50585 | Sioux Rapids | Buena Vista County | 1,080 | $71,346 | $171,100 |
| 51058 | Sutherland | O'Brien County | 1,096 | $63,036 | $159,600 |
| 51346 | Hartley | O'Brien County | 2,247 | $72,426 | $177,900 |
| 51358 | Ruthven | Palo Alto County | 1,213 | $64,583 | $187,000 |
| 51364 | Terril | Dickinson County | 803 | $66,875 | $180,600 |
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 Clay County
Nearby counties
Frequently asked questions
How many ZIP codes are in Clay County, Iowa?
10 ZIP codes are mainly in Clay County, and 7 more ZIP codes from neighboring areas reach partly into it.
What cities are in Clay County?
ZIP codes in Clay County use the city names Dickens, Everly, Fostoria, Gillett Grove, Greenville, Linn Grove, Peterson, Royal, Spencer and Webb.
What metro area is Clay County in?
Clay County is part of the Spencer, IA micropolitan statistical area.