ZIP code 57751 — Keystone

Postal code

57751Copy

Single source Value from one source, not cross-checked.

City

Keystone

County

Pennington FIPS 46103

State

South Dakota

Country

United States

Coordinates

43.8848, -103.3995 — precision precise (locality)
View on OpenStreetMap

Population

996 (ZCTA, ACS 5-year)

Population density

23 / sq mi

Land area

44.2 sq mi (114.5 km²) (ZCTA, ACS 5-year)

Median household income

$100,714

Per-capita income

$41,991

Median age

52.2

Households

366

Housing units

450

Median home value

$388,300

Median gross rent

$660 / month

Congressional district

SD At-large (119th Congress)

USDA hardiness zone

5a (-20 to -15 °F)

Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.

Time zone

America/Denver (UTC−7 / UTC−6 DST)

Area code

605

Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.

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