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Zip Code 21757 — Keymar, MD

21757 is a ZIP Code associated with Keymar, MD, located within Carroll. The postal region supports an estimated population of 2,671 residents across Data Pending housing units, with a population density of 29.3 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.599020, -77.259060)

Data Metric	Local Statistic
Postal / Zip Code	21757
Primary City	Keymar
State / Province	MD
County	Carroll
Total Population	2,671
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	29.3 people/sq mi
Timezone	America/New_York

How 21757 Compares

Metric	ZIP 21757	Carroll County	MD State Average
Population	2,671	158,322	6,205,597
Median Income	Data Pending	N/A	N/A
Population Density	29.3 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 21778	Rocky Ridge	4.3 mi	745	N/A
Zip 21798	Woodsboro	4.7 mi	2,928	N/A
Zip 21791	Union Bridge	5.5 mi	5,340	N/A
Zip 21787	Taneytown	6.8 mi	11,645	N/A
Zip 21727	Emmitsburg	7.3 mi	6,052	N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →