What city is ZIP code 57630?

ZIP code 57630 is in Whitehorse, SD (Dewey County).

What county is ZIP code 57630 in?

ZIP code 57630 is mostly in Dewey County, South Dakota.

How many people live in ZIP code 57630?

About 11 people live in the 57630 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Checked Oct 26, 2026

ZIP Code 57630

Whitehorse, SD, Dewey County

Population

Land area

110sq mi

People per sq mi

City

Whitehorse

ZIP 57630 and nearby ZIP codes

Full map

ZIP 57630 at a glance

ZIP 57630 (Whitehorse) is 99% less dense than South Dakota as a whole.

Economy and federal money

Businesses, pandemic loans and political donations

Details

PPP loans

$380K

23 loans

PPP loans in this ZIP

Environment and hazard risk

ZIP 57630, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: cold wave

Storm events since 1996

748

Countywide, mostly hail

July high / Jan low

86° / 7°F

19.4 inches of rain a year

Hazards, floods and storm history Check a flood zone

Frequently asked questions

What city is ZIP code 57630?: ZIP code 57630 is in Whitehorse, SD (Dewey County).
What county is ZIP code 57630 in?: ZIP code 57630 is mostly in Dewey County, South Dakota.
How many people live in ZIP code 57630?: About 11 people live in the 57630 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.