Lyon County, Iowa ZIP codes
8 ZIP codes are in Lyon County, plus 4 that cross in from neighboring counties.
- ZIP codes
- 8
- Population in these ZIPs
- 12,262
- Avg. median income
- $76,800population-weighted
- Cities & towns
- 8
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ZIP codes in Lyon County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 51230 | Alvord | 478 | $75,625 | $263,700 |
| 51235 | Doon | 1,007 | $71,016 | $292,200 |
| 51237 | George | 1,605 | $61,667 | $200,100 |
| 51240 | Inwood | 1,914 | $83,929 | $302,300 |
| 51241 | Larchwood | 2,103 | $87,446 | $349,600 |
| 51242 | Lester | 379 | $95,625 | $287,400 |
| 51243 | Little Rock | 735 | $83,750 | $183,900 |
| 51246 | Rock Rapids | 4,041 | $72,400 | $254,900 |
ZIP codes partly in Lyon County
These ZIP codes are mostly in a neighboring county but cover part of Lyon County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 51201 | Sheldon | Sioux County | 6,430 | $68,799 | $226,100 |
| 51232 | Ashton | Osceola County | 658 | $82,917 | $177,700 |
| 51239 | Hull | Sioux County | 2,876 | $77,540 | $317,900 |
| 51247 | Rock Valley | Sioux County | 5,094 | $78,358 | $309,100 |
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 Lyon County
Nearby counties
Frequently asked questions
How many ZIP codes are in Lyon County, Iowa?
8 ZIP codes are mainly in Lyon County, and 4 more ZIP codes from neighboring areas reach partly into it.
What cities are in Lyon County?
ZIP codes in Lyon County use the city names Alvord, Doon, George, Inwood, Larchwood, Lester, Little Rock and Rock Rapids.