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Zip Code 21057 — Glen Arm, MD

21057 is a ZIP Code associated with Glen Arm, MD, located within Baltimore. The postal region supports an estimated population of 4,386 residents across Data Pending housing units, with a population density of 106.6 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.451110, -76.506060)

Data Metric	Local Statistic
Postal / Zip Code	21057
Primary City	Glen Arm
State / Province	MD
County	Baltimore
Total Population	4,386
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	106.6 people/sq mi
Timezone	America/New_York

How 21057 Compares

Metric	ZIP 21057	Baltimore County	MD State Average
Population	4,386	1,414,366	6,205,597
Median Income	Data Pending	N/A	N/A
Population Density	106.6 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 21082	Hydes	3.0 mi	626	N/A
Zip 21051	Fork	3.1 mi	172	N/A
Zip 21234	Parkville	4.1 mi	66,334	N/A
Zip 21013	Baldwin	4.2 mi	5,610	N/A
Zip 21286	Towson	4.4 mi	21,853	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 →