| ZIP Codes: | 15 ZIP Codes (12 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Code: | 701 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:41 PM |
| Population: | 3,050 [See All] |
| FIPS: | 38021 |
| Land Area: | 1,851 sq mi |
| Water Area: | 3 sq mi |
| Coordinates: | 46.1402, -98.2454 |
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37,902 residents live across 15 ZIPs covering 1,851 sq mi, served by 14 distinct USPS-recognized cities.
Population moved from 38,009 to 37,902 from 2014 to 2024 — a -0.3% change. 3 ZIPs gained residents, 11 lost.
The county's wealthiest ZIP 57449 (Houghton, $150,000 median) and poorest ZIP 57446 (Hecla, $44,375) are 7.7 miles apart — a 3.4× income gap across local geography.
Median home values vary 7.2× across this county — from $50,400 in 57446 (Hecla) to $363,700 in 57427 (Bath).
Density varies 81× across the county — from 1 people/sq mi in 57446 (Hecla) to 110 in 57401 (Aberdeen).
Educational attainment ranges from 8.8% bachelor's+ in 57427 (Bath) to 40.8% in 57479 (Warner) — the breadth of educational profiles across the area.
Within South Dakota, this is the #34 most populous of 64 counties and ranks #26 for median household income .
Weighted by population, the typical household earns about $72,851 across the county — reflecting what a typical resident sees, not a simple ZIP average.
33.8% of adults age 25+ hold a bachelor's degree or higher (8,453 of 24,973 reporting).
12 Standard delivery, 3 PO Box only, 0 single-entity Unique ZIPs serve this county.
Median household income spans 3.4× between the wealthiest and poorest ZIPs — a sign of significant intra-county inequality.
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.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57401 | Aberdeen | Standard | 31,939 | $68,835 | 291.5 | 2.9% |
| 57445 | Groton | Standard | 2,072 | $84,948 | 253.2 | -7.0% |
| 57441 | Frederick | Standard | 670 | $108,009 | 300.9 | -12.2% |
| 57479 | Warner | Standard | 625 | $102,222 | 48.8 | -12.1% |
| 57432 | Claremont | Standard | 507 | $112,765 | 104.7 | -11.5% |
| 57427 | Bath | Standard | 384 | $83,977 | 63.8 | -44.3% |
| 57449 | Houghton | Standard | 357 | $150,000 | 86.6 | 351.9% |
| 57433 | Columbia | Standard | 318 | $50,417 | 127.0 | -24.1% |
| 57481 | Westport | Standard | 271 | $68,125 | 192.4 | -52.5% |
| 57460 | Mansfield | Standard | 257 | $139,500 | 130.5 | -37.2% |
| 57474 | Stratford | Standard | 237 | $100,833 | 76.6 | 68.1% |
| 57446 | Hecla | Standard | 223 | $44,375 | 165.6 | -26.2% |
| 57426 | Barnard | PO Box | 42 | $78,875 | 8.0 | -40.0% |
| 57439 | Ferney | PO Box | 0 | — | 1.0 | -100.0% |
| 57402 | Aberdeen | PO Box | — | — | 0.0 | — |