ZIP Code 21771
| ZIP Code | 21771 |
| City | MOUNT AIRY |
| State | MD |
| Type | STANDARD |
| Post offices count | 1 (see all) |
| Total population | 31,755 (see all) |
Cities in ZIP Code 21771
Primary city: MOUNT AIRY, MDPost offices
MOUNT AIRY — Post Office™ 505 WINDY KNOLL DR MOUNT AIRY, MD 21771-9998 MoreMOUNT AIRY — Post Office™505 WINDY KNOLL DR For facility accessibility, please call the Post Office. 1-800-ASK-USPS® (800-275-8777) Hours
Services at this Location Service hours may vary.
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Census data for ZIP Code 21771
Demographic and housing estimates in ZIP Code 21771
| Total population | 31,755 |
| Male | 15,873 |
| Female | 15,882 |
| Total population | 31,755 |
| Under 5 years | 1,902 |
| 5 to 9 years | 2,627 |
| 10 to 14 years | 1,870 |
| 15 to 19 years | 2,081 |
| 20 to 24 years | 1,642 |
| 25 to 34 years | 3,019 |
| 35 to 44 years | 3,933 |
| 45 to 54 years | 5,052 |
| 55 to 59 years | 2,964 |
| 60 to 64 years | 2,189 |
| 65 to 74 years | 2,721 |
| 75 to 84 years | 1,367 |
| 85 years and over | 388 |
| Median age (years) | 41.7 |
| Under 18 years | 7,697 |
| 16 years and over | 25,054 |
| 18 years and over | 24,058 |
| 21 years and over | 23,014 |
| 62 years and over | 5,645 |
| 65 years and over | 4,476 |
| Total population | 31,755 |
| One race | 30,783 |
| White | 28,617 |
| Black or African American | 946 |
| American Indian and Alaska Native | 15 |
| Asian | 548 |
| Native Hawaiian and Other Pacific Islander | 13 |
| Some other race | 644 |
| Two or more races | 972 |
| Citizen, VOTING AGE 18 and over population | 23,381 |
| Male Citizen, VOTING AGE 18 and over population | 11,421 |
| Female Citizen, VOTING AGE 18 and over population | 11,960 |
Social characteristics in ZIP Code 21771
| Total households | 10,602 |
| Family households (families) | 7,566 |
| Married-couple family | 398 |
| Male householder, no wife present, family | 1,064 |
| Female householder, no husband present, family | 674 |
| Nonfamily households | 1,574 |
| Average household size | 3,010 |
| Average family size | 2.98 |
Economic characteristics in ZIP Code 21771
| Total households | 10,602 |
| Less than $10,000 | 269 |
| $10,000 to $14,999 | 85 |
| $15,000 to $24,999 | 284 |
| $25,000 to $34,999 | 344 |
| $35,000 to $49,999 | 473 |
| $50,000 to $74,999 | 1,097 |
| $75,000 to $99,999 | 942 |
| $100,000 to $149,999 | 2,483 |
| $150,000 to $199,999 | 1,828 |
| $200,000 or more | 2,797 |
| Median household income (dollars) | 137,500 |
Housing characteristics in ZIP Code 21771
| Total housing units | 11,109 |
| Occupied housing units | 10,602 |
| Vacant housing units | 507 |
| Total housing units | 11,109 |
| 1-unit, detached | 9,539 |
| 1-unit, attached | 1,085 |
| 2 units | 48 |
| 3 or 4 units | 13 |
| 5 to 9 units | 10 |
| 10 to 19 units | 34 |
| 20 or more units | 53 |
| Mobile home | 327 |
| Boat, RV, van, etc. | 0 |
| Total housing units | 11,109 |
| Built 2014 or later | 22 |
| Built 2010 to 2013 | 399 |
| Built 2000 to 2009 | 2,051 |
| Built 1990 to 1999 | 2,449 |
| Built 1980 to 1989 | 2,286 |
| Built 1970 to 1979 | 2,052 |
| Built 1960 to 1969 | 670 |
| Built 1950 to 1959 | 217 |
| Built 1940 to 1949 | 201 |
| Built 1939 or earlier | 762 |
| Total housing units | 11,109 |
| 1 room | 87 |
| 2 rooms | 50 |
| 3 rooms | 117 |
| 4 rooms | 381 |
| 5 rooms | 733 |
| 6 rooms | 1,342 |
| 7 rooms | 1,538 |
| 8 rooms | 1,864 |
| 9 rooms or more | 4,997 |
| Median rooms | 8.2 |
| Total housing units | 11,109 |
| No bedroom | 106 |
| 1 bedroom | 139 |
| 2 bedrooms | 938 |
| 3 bedrooms | 3,727 |
| 4 bedrooms | 4,726 |
| 5 or more bedrooms | 1,473 |
| Occupied housing units | 10,602 |
| Owner-occupied | 9,762 |
| Renter-occupied | 840 |
| Average household size of owner-occupied unit | 3.00 |
| Average household size of renter-occupied unit | 2.70 |
| Occupied housing units | 10,602 |
| Moved in 2017 or later | 611 |
| Moved in 2015 to 2016 | 1,763 |
| Moved in 2010 to 2014 | 1,758 |
| Moved in 2000 to 2009 | 2,841 |
| Moved in 1990 to 1999 | 2,119 |
| Moved in 1989 and earlier | 1,510 |
| Owner-occupied units | 9,762 |
| Less than $50,000 | 206 |
| $50,000 to $99,999 | 63 |
| $100,000 to $149,999 | 20 |
| $150,000 to $199,999 | 95 |
| $200,000 to $299,999 | 1,219 |
| $300,000 to $499,999 | 4,768 |
| $500,000 to $999,999 | 3,293 |
| $1,000,000 or more | 98 |
| Median (dollars) | 434,200 |
| Owner-occupied units | 9,762 |
| Housing units with a mortgage | 7,451 |
| Housing units without a mortgage | 2,311 |
| Occupied units paying rent | 714 |
| Less than $500 | 9 |
| $500 to $999 | 80 |
| $1,000 to $1,499 | 262 |
| $1,500 to $1,999 | 185 |
| $2,000 to $2,499 | 172 |
| $2,500 to $2,999 | 0 |
| $3,000 or more | 6 |
| Median (dollars) | 1,516 |
| No rent paid | 126 |
Data is based on 2021 Census