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ZIP Code Database - Facts & Stats

Data Last Updated: October 1, 2021

ZIP Codes for City of Keymar, MD

Keymar, MD Covers 1 ZIP Code

ZIP CodeTypeCountyPopulationArea Code(s)
ZIP Code 21757StandardCarroll3,036443 / 410 / 667

Timezone(s):Eastern (GMT -05:00)
Counties:CARROLL, MD
Population:3,036 (More Details)
Male Population:1,568
Female Population:1,468
Median Age:44
ZIP Codes:1
Area Codes:3
Total Area:453 square miles (county)
Land Area:448 square miles (county)
Water Area:5 square miles (county)

Keymar, MD Demographic Information *

There is no Census data for the city of KEYMAR, MD. We have pulled information for the ZIP Code 21757 instead.
Total population3,036
Male population1,568
Female population1,468
Median age (years)44
White Population2,906
Black Population51
Indian Population6
Asian Population18
Hawaiian Population0
Hispanic Population82
Median age (Male)43
Median age (Female)44.7
Total households1,103
Family households (families)858
Average household size2.71
Average family size3.01
Total housing units1,170
* Demographic data is based on 2010 Census.

Keymar, MD Other Information

  • Located in CARROLL County, Maryland
  • Keymar, MD is also known as:
    • DETOUR, MD

174 Cities within 30 miles of Keymar, MD Products


  1. U.S. Postal Service [Last Updated: 10/1/2021],
  2. Internal Data Creation [Last Updated: 10/1/2021],
  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],