Zip lookup · MD

21791
Union Bridge, Maryland.

Union Bridge, Frederick County, MD · Washington-Arlington-Alexandria, DC-VA-MD-WV metro · population 5,340

What it costs per month · 21791 $2,335/mo

to buy the typical home at today's mortgage rate — +$1,182 (+103%) since Jan 2020.

What the home itself did
1 year
Up $2,159 +0%
$442,741$444,900 since Sep 2025
5 years
Up $69,285 +18%
$375,615$444,900 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.

$500 $1,000 $1,500 $2,000 2002 2006 2010 2014 2018 2022 2026 21791 $2,335 United States $1,922
$500 $1,000 $1,500 $2,000 2002 2010 2018 2026
  • 21791$2,335
  • United States$1,922

At the last five years' pace, a typical home here doubles in price every 20 years.

Typical home values in zip 21791 rose 0.5% over the past year — slower than the nation's +1.2%.

This zip spans 2 counties: Frederick County, MD 61% · Carroll County, MD 39%

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

Typical home value $444,900 as of Sep 2026
+0.5%year on year

Typical home value — 21791

Mid-tier homes, smoothed and seasonally adjusted.

$200,000 $300,000 $400,000 $500,000 2018 2020 2022 2024 2026 21791 $444,900 Washington $569,857 United States $366,157
$200,000 $300,000 $400,000 $500,000 2018 2022 2026
  • 21791$444,900
  • Washington$569,857
  • United States$366,157

Within 20 miles

10 mi 20 mi 50 mi
Miles Zip City Population Rent Home value
4.7 21776 New Windsor 6,261 — $481,505
5.4 21762 Libertytown 139 — $324,370
5.5 21757 Keymar 2,671 — $454,316
6.0 21798 Woodsboro 2,928 — $500,713
8.9 21787 Taneytown 11,645 — $395,611
9.1 21793 Walkersville 10,719 $2,000 $460,763
9.5 21778 Rocky Ridge 745 — $440,138
10.3 21701 Frederick 43,048 $2,158 $443,257
10.3 21771 Mount Airy 33,031 $2,562 $625,933
10.5 21774 New Market 17,134 $2,821 $591,215
10.9 21158 Westminster 22,083 $1,997 $466,583
11.0 21157 Westminster 38,984 $1,619 $460,921
12.7 21727 Emmitsburg 6,052 $1,188 $368,546
12.9 21788 Thurmont 11,654 $2,262 $391,478
13.7 21770 Monrovia 8,751 — $652,546
15.1 21702 Frederick 49,605 $1,958 $451,936
15.1 21784 Sykesville 39,258 $2,103 $553,043
15.1 21048 Finksburg 10,481 — $555,748
15.3 17340 Littlestown 11,405 $1,145 $339,563
15.7 21754 Ijamsville 8,156 — $680,004
15.8 21797 Woodbine 8,643 — $800,294
16.6 21704 Frederick 20,006 $2,994 $644,613
17.4 20872 Damascus 13,983 — $540,987
17.6 21723 Cooksville 669 — $910,236
17.6 21780 Sabillasville 2,159 — $405,225
19.0 17320 Fairfield 8,124 — $348,249
19.0 21074 Hampstead 14,777 — $431,878
19.3 21703 Frederick 41,960 $2,296 $410,271
19.5 21773 Myersville 5,826 — $547,465
19.8 17325 Gettysburg 30,373 $1,432 $368,178

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