Zip Code 21771
Mount Airy, Maryland — Frederick County
📍 ZIP code 21771 is in Mount Airy, Frederick County, Maryland.
ZIP code 21771 is located in Mount Airy, Frederick County, Maryland. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 32,827. The area code for ZIP code 21771 is 301.
Quick Answer
Zip code 21771 is in Mount Airy, Maryland (Frederick County). It has a population of 32,827, median household income of $154,844, and median home value of $532,200.
Population
32,827
Income
$154,844
Home Value
$532,200
Climate
84°F / 25°F
About Zip Code 21771
Zip code 21771 is located in Mount Airy, Maryland, within Frederick County. Home to approximately 32,827 residents, this area sits at an elevation of 721 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 301.
The median household income is $154,844 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $532,200, and the cost of living index is 187 (87% above the national average of 100).
Summers average a high of 84°F while winters drop to 25°F. The area receives about 48 in of rain and 31 in of snow annually. The zip code covers 85.1 square miles of land area and 0.2 square miles of water.
Key Statistics
32,827
$154,844
$532,200
Eastern (EST/EDT)
301
721 ft
85.1 sq mi
41.4
11,401
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Compare With Nearby Zip Codes
| Metric | 21771 | 21770 | 21774 | 21797 | 21762 | 20872 |
|---|---|---|---|---|---|---|
| City | Mount Airy, MD | Monrovia, MD | New Market, MD | Woodbine, MD | Libertytown, MD | Damascus, MD |
| Population | 32,827 | 7,815 | 16,515 | 8,772 | 176 | 13,138 |
| Median Income | $154,844 | $184,464 | $171,875 | $185,435 | $0 | $132,804 |
| Home Value | $532,200 | $599,700 | $508,100 | $713,400 | $0 | $478,300 |
| Cost of Living | 187 | 216 | 187 | 240 | 100 | 168 |
| Median Age | 41.4 | 41.2 | 35.8 | 44 | 34 | 41.2 |
Cost of Living
100 = National Average. Mount Airy's cost of living is 87% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
3.4x
Demographics
Zip code 21771 has a population of 32,827 people with a median age of 41.4. There are 11,401 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Mount Airy (21771) population trend from 2010 to 2024
↓ -3.3%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
84°F
25°F
48 in
31 in
Mount Airy experiences warm summers with average highs around 84°F. Winters are cool with lows averaging 25°F. With 31 in of annual snowfall, residents should be prepared for significant winter weather.
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Housing & Economy
Median Home Value
$532,200
Median Household Income
$154,844
With 11,401 housing units across 85.1 square miles, 21771 has a housing density of 134 units per square mile. The home price-to-income ratio is 3.4x.
Location & Geography
Latitude
39.3946°
Longitude
-77.1640°
Land Area
85.1 sq mi
Water Area
0.2 sq mi
Nearby Zip Codes
Zip codes closest to 21771 (Mount Airy, MD) with distances:
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ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 21771's $154,844. A way to compare Mount Airy to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 21771 (Mount Airy, MD). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Mount Airy, Maryland?
Mount Airy, Maryland uses zip code 21771.
What county is zip code 21771 in?
Zip code 21771 is located in Frederick County, Maryland.
What is the population of zip code 21771?
The population of zip code 21771 is 32,827 with a median age of 41.4.
Is 21771 in Mount Airy, Maryland?
Yes, zip code 21771 is in Mount Airy, Frederick County, Maryland. The area code is 301.
Frequently Asked Questions
What city is zip code 21771 in?
Zip code 21771 is in Mount Airy, Maryland. It is part of Frederick County and uses the Eastern (EST/EDT) timezone.
What is zip code 21771?
Zip code 21771 is a U.S. postal code in Mount Airy, Maryland (Frederick County). It has a population of 32,827 and covers 85.1 square miles.
What is the population of zip code 21771?
The population of zip code 21771 (Mount Airy, MD) is 32,827 with a median age of 41.4. There are approximately 11,401 housing units in this area.
What is the median income in zip code 21771?
The median household income in zip code 21771 (Mount Airy, MD) is $154,844 per year. The cost of living index is 187 (100 = national average).
What is the average home price in zip code 21771?
The median home value in zip code 21771 (Mount Airy, MD) is $532,200. The cost of living index is 187 compared to the national average of 100.
What county is zip code 21771 in?
Zip code 21771 is located in Frederick County, Maryland. The primary city is Mount Airy.
What is the area code for zip code 21771?
Zip code 21771 in Mount Airy, MD uses area code 301. It is located in the Eastern (EST/EDT) timezone.
Is zip code 21771 a good place to live?
Zip code 21771 (Mount Airy, MD) has a cost of living index of 187 (100 = national average), a median household income of $154,844, and median home values of $532,200. The median age is 41.4. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 21771?
The cost of living index for zip code 21771 (Mount Airy, MD) is 187, where 100 represents the national average. This area is above the national average. Median home value: $532,200.
What schools serve zip code 21771?
Zip code 21771 in Mount Airy, Maryland is served by the local school district of Frederick County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.