| ZIP Codes: | 7 ZIP Codes (7 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Codes: | 402 / 531 / 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:14:55 PM |
| Population: | 1,379 [See All] |
| FIPS: | 46053 |
| Land Area: | 1,338 sq mi |
| Water Area: | 26 sq mi |
| Coordinates: | 43.1296, -99.1009 |
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4,094 residents live across 7 ZIPs covering 1,338 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 4,639 to 4,094 from 2014 to 2024 — a -11.7% change. 1 ZIPs gained residents, 5 lost (and 1 held flat).
The county's wealthiest ZIP 57335 (Fairfax, $92,813 median) and poorest ZIP 57538 (Herrick, $46,875) are 18.7 miles apart — a 2.0× income gap across local geography.
Median home values vary 4.3× across this county — from $61,400 in 57538 (Herrick) to $266,300 in 57529 (Dallas).
Density varies 4× across the county — from 1 people/sq mi in 57529 (Dallas) to 4 in 57533 (Gregory).
Educational attainment ranges from 16.9% bachelor's+ in 57529 (Dallas) to 26.3% in 57523 (Burke) — the breadth of educational profiles across the area.
Within South Dakota, this is the #63 most populous of 77 counties and ranks #59 for median household income .
Weighted by population, the typical household earns about $62,933 across the county — reflecting what a typical resident sees, not a simple ZIP average.
21.8% of adults age 25+ hold a bachelor's degree or higher (626 of 2,871 reporting).
7 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.
Gregory County lost 12.2% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57533 | Gregory | Standard | 1,674 | $58,500 | 397.4 | -12.9% |
| 57523 | Burke | Standard | 1,041 | $68,750 | 270.6 | -9.1% |
| 57317 | Bonesteel | Standard | 573 | $50,833 | 145.8 | -1.9% |
| 57335 | Fairfax | Standard | 303 | $92,813 | 129.2 | 17.4% |
| 57529 | Dallas | Standard | 245 | $75,313 | 235.0 | -45.7% |
| 57538 | Herrick | Standard | 236 | $46,875 | 120.6 | -7.8% |
| 57571 | Saint Charles | Standard | 22 | — | 39.6 | 0.0% |