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Zip Code 21771 — Mount Airy, MD

21771 is a ZIP Code associated with Mount Airy, MD, located within Frederick. The postal region supports an estimated population of 33,031 residents across Data Pending housing units, with a population density of 142.5 people per square mile.

WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (39.395500, -77.158690)

Data Metric	Local Statistic
Postal / Zip Code	21771
Primary City	Mount Airy
State / Province	MD
County	Frederick
Total Population	33,031
Median Household Income	Data Pending
Total Housing Units	Data Pending
Population Density	142.5 people/sq mi
Timezone	America/New_York

How 21771 Compares

Metric	ZIP 21771	Frederick County	MD State Average
Population	33,031	300,100	6,205,597
Median Income	Data Pending	N/A	N/A
Population Density	142.5 /sq mi	--	--

Nearby ZIP Codes

ZIP Code	City	Distance	Population	Median Income
Zip 21770	Monrovia	6.1 mi	8,751	N/A
Zip 21797	Woodbine	6.4 mi	8,643	N/A
Zip 21774	New Market	6.5 mi	17,134	N/A
Zip 21762	Libertytown	7.6 mi	139	N/A
Zip 20872	Damascus	7.8 mi	13,983	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 →