Town Chart.

← Look up another ZIP code · All towns in South Dakota

ZIP code 57751

Keystone, SD · Pennington County

About ZIP code 57751

  • ZIP code 57751 is in Keystone, Pennington County, South Dakota.
  • About 893 people live in it, which is 7.8 people per square mile.
  • It also reaches into Custer County.
  • Time zone: Mountain Standard Time.
  • The middle of the ZIP code is at 43.868, -103.423.

A ZIP code is a mail delivery area, not a town border, and one ZIP code can cover parts of several towns. To check a single address, use the US Postal Service lookup.

Keystone, SD

ZIP code 57751 is the post office name for Keystone, SD. 336 people live in Keystone. Typical household income is $64,702. A typical home costs $263,900.

  • Stronger than most towns on: Cost of living, Dining and entertainment and Diversity & community.
  • Weaker than most towns on: Airport access, Short commute and Space and yard size.

See all figures for Keystone

Nearby ZIP codes

ZIP code list from SimpleMaps US Zips. Population is a US Census Bureau estimate. These are estimates, so check official sources before you decide.