| ZIP Codes: | 14 ZIP Codes (13 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Code: | 605 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:13:43 PM |
| Population: | 117,460 [See All] |
| FIPS: | 46103 |
| CBSA: | Rapid City, SD |
| Land Area: | 3,389 sq mi |
| Water Area: | 24 sq mi |
| Coordinates: | 44.0711, -102.8982 |
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117,460 residents live across 14 ZIPs covering 3,389 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 106,378 to 117,460 from 2014 to 2024 — a +10.4% change. 7 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 57751 (Keystone, $97,969 median) and poorest ZIP 57701 (Rapid City, $56,461) are 19.5 miles apart — a 1.7× income gap across local geography.
Median home values vary 2.5× across this county — from $187,500 in 57790 (Wall) to $473,500 in 57751 (Keystone).
Density varies 520× across the county — from 2 people/sq mi in 57790 (Wall) to 856 in 57701 (Rapid City).
Educational attainment ranges from 22.6% bachelor's+ in 57703 (Rapid City) to 49.5% in 57702 (Rapid City) — the breadth of educational profiles across the area.
Within South Dakota, this is the #2 most populous of 82 counties and ranks #16 for median household income with the #14 fastest decade growth .
Weighted by population, the typical household earns about $74,980 across the county — reflecting what a typical resident sees, not a simple ZIP average.
34.6% of adults age 25+ hold a bachelor's degree or higher (28,326 of 81,925 reporting).
13 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 57701 | Rapid City | Standard | 45,795 | $56,461 | 53.5 | 4.0% |
| 57702 | Rapid City | Standard | 35,595 | $91,457 | 293.6 | 2.4% |
| 57703 | Rapid City | Standard | 18,013 | $83,739 | 124.4 | 25.0% |
| 57719 | Box Elder | Standard | 12,221 | $74,885 | 121.1 | 73.8% |
| 57745 | Hill City | Standard | 1,894 | $88,194 | 330.4 | -12.0% |
| 57761 | New Underwood | Standard | 1,180 | $97,734 | 484.8 | 9.2% |
| 57790 | Wall | Standard | 1,147 | $75,096 | 696.7 | -8.0% |
| 57751 | Keystone | Standard | 893 | $97,969 | 30.6 | 28.1% |
| 57767 | Owanka | Standard | 234 | $250,001 | 167.8 | 129.4% |
| 57775 | Quinn | Standard | 191 | $77,750 | 224.3 | -52.1% |
| 57725 | Caputa | Standard | 130 | $48,214 | 113.4 | -24.9% |
| 57791 | Wasta | Standard | 97 | $42,250 | 270.2 | -52.5% |
| 57780 | Scenic | Standard | 70 | $40,192 | 478.1 | -15.7% |
| 57709 | Rapid City | PO Box | — | — | 0.0 | — |