Zip lookup · MD

21771
Mount Airy, Maryland.

Mount Airy, Carroll County, MD · Baltimore-Columbia-Towson, MD metro · population 33,031

What it costs per month · 21771 $3,285/mo

to buy the typical home at today's mortgage rate — +$1,661 (+102%) since Jan 2020.

What the home itself did
1 year
Up $4,975 +1%
$620,959$625,933 since Sep 2025
5 years
Up $96,757 +18%
$529,176$625,933 since Sep 2021

Monthly payment to buy the typical home

Home value × that month's 30-year mortgage rate, 20% down, principal and interest. This is the line households feel: prices and rates compound each other.

$1,000 $2,000 $3,000 2002 2006 2010 2014 2018 2022 2026 21771 $3,285 United States $1,922
$1,000 $2,000 $3,000 2002 2010 2018 2026
  • 21771$3,285
  • United States$1,922

At the last five years' pace, a typical home here doubles in price every 21 years.

Typical home values in zip 21771 rose 0.8% over the past year — slower than the nation's +1.2%.

This zip spans 4 counties: Frederick County, MD 51% · Carroll County, MD 26% · Howard County, MD 18% · Montgomery County, MD 4%

Zillow also publishes an index for the city itself: Mount Airy, MD — measured over the city limits, which is a different area from this zip.

Asking rent $2,562 as of Jul 2026
Typical home value $625,933 as of Sep 2026
+0.8%year on year

Asking rent — 21771

Against the Baltimore-Columbia-Towson, MD metro and the national benchmark.

$2,000 $2,200 $2,400 $2,600 2026 21771 $2,562 Baltimore $1,927 United States $1,926
$2,000 $2,200 $2,400 $2,600 2026
  • 21771$2,562
  • Baltimore$1,927
  • United States$1,926

Typical home value — 21771

Mid-tier homes, smoothed and seasonally adjusted.

$200,000 $400,000 $600,000 2018 2020 2022 2024 2026 21771 $625,933 Baltimore $396,959 United States $366,157
$200,000 $400,000 $600,000 2018 2022 2026
  • 21771$625,933
  • Baltimore$396,959
  • United States$366,157

Within 20 miles

Showing 30 of 54 zips in range — sorting picks from all 54.

10 mi 20 mi 50 mi
Miles Zip City Population Rent Home value
6.1 21770 Monrovia 8,751 — $652,546
6.4 21797 Woodbine 8,643 — $800,294
6.5 21774 New Market 17,134 $2,821 $591,215
7.6 21762 Libertytown 139 — $324,370
7.8 20872 Damascus 13,983 — $540,987
9.0 21776 New Windsor 6,261 — $481,505
9.1 21754 Ijamsville 8,156 — $680,004
9.2 21723 Cooksville 669 — $910,236
9.9 21784 Sykesville 39,258 $2,103 $553,043
10.1 21701 Frederick 43,048 $2,158 $443,257
10.3 21791 Union Bridge 5,340 — $444,900
10.7 21738 Glenwood 3,696 — $977,442
11.3 20882 Gaithersburg 13,751 — $785,756
11.5 20871 Clarksburg 30,182 $3,062 $624,133
11.8 21793 Walkersville 10,719 $2,000 $460,763
11.9 21704 Frederick 20,006 $2,994 $644,613
12.0 21794 West Friendship 2,192 — $1,028,318
12.3 21737 Glenelg 2,474 — $1,193,112
12.4 21798 Woodsboro 2,928 — $500,713
13.6 20876 Germantown 26,406 $2,121 $473,455
13.8 21104 Marriottsville 6,052 — $716,377
13.9 21036 Dayton 2,569 — $1,008,338
14.2 21157 Westminster 38,984 $1,619 $460,921
14.2 20833 Brookeville 7,860 — $801,829
14.9 21048 Finksburg 10,481 — $555,748
15.0 21757 Keymar 2,671 — $454,316
15.1 20886 Montgomery Village 34,718 $2,415 $381,090
15.6 20879 Gaithersburg 25,264 $1,995 $433,074
16.5 20838 Barnesville 306 — $704,561
16.6 21163 Woodstock 7,539 — $649,015

Coordinates and population from SimpleMaps US Zips (Basic). Rent and home values from Zillow Research.