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ZIP Code Database - Facts & Stats

Data Last Updated: May 1, 2022

ZIP Codes for City of Keystone, SD

Keystone, SD Covers 1 ZIP Code

ZIP CodeTypeCountyPopulationArea Code(s)
ZIP Code 57751StandardPennington844605

Timezone(s):Mountain (GMT -07:00)
Population:337 (More Details)
Male Population:171
Female Population:166
Median Age:43
ZIP Codes:1
Area Codes:1
Total Area:2,784 square miles (county)
Land Area:2,777 square miles (county)
Water Area:8 square miles (county)

Keystone, SD Demographic Information *

Total population337
Male population171
Female population166
Median age (years)42.8
White Population316
Black Population0
Indian Population11
Asian Population2
Hawaiian Population1
Hispanic Population28
Median age (Male)44.8
Median age (Female)41.3
Total households153
Family households (families)81
Average household size2.2
Average family size2.83
Total housing units230
* Demographic data is based on 2010 Census.

Keystone, SD Other Information

15 Cities within 30 miles of Keystone, SD Products


  1. U.S. Postal Service [Last Updated: 5/1/2022],
  2. Internal Data Creation [Last Updated: 5/1/2022],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],