| ZIP Codes: | 13 ZIP Codes (13 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 712 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:11:55 PM |
| Population: | 661 [See All] |
| FIPS: | 19167 |
| Land Area: | 781 sq mi |
| Water Area: | 0 sq mi |
| Coordinates: | 43.0916, -96.5360 |
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36,232 residents live across 13 ZIPs covering 781 sq mi, served by 13 distinct USPS-recognized cities.
Population moved from 34,176 to 36,232 from 2014 to 2024 — a +6.0% change. 8 ZIPs gained residents, 5 lost.
The county's wealthiest ZIP 51036 (Maurice, $122,841 median) and poorest ZIP 51238 (Hospers, $74,000) are 15.9 miles apart — a 1.7× income gap across local geography.
Median home values vary 1.7× across this county — from $173,300 in 51023 (Hawarden) to $294,000 in 51250 (Sioux Center).
Density varies 16× across the county — from 9 people/sq mi in 51036 (Maurice) to 147 in 51250 (Sioux Center).
Educational attainment ranges from 15.1% bachelor's+ in 51247 (Rock Valley) to 42.9% in 51041 (Orange City) — the breadth of educational profiles across the area.
Within Iowa, this is the #80 most populous of 82 counties and ranks #12 for median household income .
Weighted by population, the typical household earns about $86,919 across the county — reflecting what a typical resident sees, not a simple ZIP average.
30.6% of adults age 25+ hold a bachelor's degree or higher (6,620 of 21,613 reporting).
13 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
Sioux County lost 17.4% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 51250 | Sioux Center | Standard | 9,970 | $94,119 | 68.0 | 19.7% |
| 51041 | Orange City | Standard | 7,324 | $83,643 | 72.1 | -2.6% |
| 51247 | Rock Valley | Standard | 5,094 | $78,358 | 119.1 | -1.5% |
| 51023 | Hawarden | Standard | 3,473 | $80,357 | 88.8 | 9.1% |
| 51239 | Hull | Standard | 2,876 | $77,540 | 67.9 | -14.5% |
| 51003 | Alton | Standard | 1,938 | $101,250 | 56.4 | 19.9% |
| 51238 | Hospers | Standard | 1,502 | $74,000 | 49.9 | 18.0% |
| 51027 | Ireton | Standard | 1,280 | $100,893 | 84.1 | 21.9% |
| 51234 | Boyden | Standard | 1,172 | $84,318 | 51.9 | 0.4% |
| 51022 | Granville | Standard | 960 | $96,505 | 72.7 | 28.3% |
| 51036 | Maurice | Standard | 445 | $122,841 | 47.9 | -25.1% |
| 51244 | Matlock | Standard | 144 | $83,365 | 0.4 | 58.2% |
| 51011 | Chatsworth | Standard | 54 | $44,375 | 1.4 | -20.6% |