| ZIP Codes: | 6 ZIP Codes (5 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:41 PM |
| Population: | 28,807 [See All] |
| FIPS: | 46029 |
| CBSA: | Watertown, SD |
| Land Area: | 756 sq mi |
| Water Area: | 57 sq mi |
| Coordinates: | 45.0121, -97.1908 |
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28,807 residents live across 6 ZIPs covering 756 sq mi, served by 6 distinct USPS-recognized cities.
Population moved from 27,443 to 28,807 from 2014 to 2024 — a +5.0% change. 3 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 57245 (Kranzburg, $86,250 median) and poorest ZIP 57243 (Henry, $48,542) are 23.0 miles apart — a 1.8× income gap across local geography.
Median home values vary 2.7× across this county — from $89,200 in 57272 (Wallace) to $242,700 in 57201 (Watertown).
Density varies 68× across the county — from 3 people/sq mi in 57263 (South Shore) to 200 in 57245 (Kranzburg).
Educational attainment ranges from 12.5% bachelor's+ in 57243 (Henry) to 21.8% in 57201 (Watertown) — the breadth of educational profiles across the area.
Within South Dakota, this is the #6 most populous of 82 counties and ranks #49 for median household income .
Weighted by population, the typical household earns about $72,666 across the county — reflecting what a typical resident sees, not a simple ZIP average.
21.4% of adults age 25+ hold a bachelor's degree or higher (4,198 of 19,626 reporting).
5 Standard delivery, 1 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.
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 |
|---|---|---|---|---|---|---|
| 57201 | Watertown | Standard | 26,781 | $72,878 | 334.2 | 6.4% |
| 57235 | Florence | Standard | 774 | $83,462 | 135.7 | -8.4% |
| 57243 | Henry | Standard | 549 | $48,542 | 124.9 | -24.3% |
| 57263 | South Shore | Standard | 351 | $58,214 | 118.6 | -10.9% |
| 57272 | Wallace | Standard | 201 | $83,750 | 41.3 | 6.9% |
| 57245 | Kranzburg | PO Box | 151 | $86,250 | 0.8 | 26.9% |