ZIP code
21791
Union Bridge, MD
21791 covers Union Bridge in Carroll County, with 4,734 people in the ACS 2023 estimate.
Figures are for the Census ZIP Code Tabulation Area (ZCTA), which is not the same as a USPS ZIP code. A PO Box or unique ZIP may have no ZCTA and no demographics. Methodology
U.S. Census Bureau, ACS 2019–2023 5-year (vintage 2023). Geography: ZCTA 21791. Methodology
ZIP code map of 21791
About ZIP code 21791
Acceptable cities: Linwood
More enterprise fields
Commercial ZIP directory · not ACS
Commercial ZIP directory population_count for ZCTA 21791. Not ACS. Methodology
People in 21791
Race
- White4,790
- Black or African American120
- American Indian or Alaska Native9
- Asian47
- Other race55
- Two or more races271
Hispanic or Latino (any race): 122
Age
- Under 10662
- 10 to 19627
- 20 to 29617
- 30 to 39651
- 40 to 49577
- 50 to 59807
- 60 to 69740
- 70 to 79407
- 80 and older204
Income and housing in 21791
Education
- High school graduate94.4%
- Bachelor's degree26.3%
- Graduate degree11.0%
Places covering 21791
Cities and places — Population overlap
Share of this ZIP/ZCTA’s population located within each place, based on ZIP Code Database place-overlap data. This is a population measure, not land-area overlap or the Census-place population.
- Union Bridge17.7%
- Libertytown5.8%
ZIP Code Database place-overlap table, field percent_of_zip_population_in_place, keyed by place_geoid. Not ACS 2019–2023. Overlap vintage is the shipped overlap table and is separate from ACS. Methodology
Counties — Population overlap
Share of this ZIP/ZCTA’s population located within each county, based on ZIP Code Database county-overlap data. This is a population measure, not land-area overlap or the Census county population.
- Carroll County52.9%
- Frederick County47.1%
ZIP Code Database county-overlap table, field percent_of_zip_population_in_county, keyed by county_geoid. Not ACS 2019–2023. Overlap vintage is the shipped overlap table and is separate from ACS. Methodology
76.5% of this ZIP is outside city limits (a real overlap row, not missing data).
Population history for 21791
Hover the chart or read the table below (Year | ACS | IRS).
| Year | ACS population | IRS population |
|---|---|---|
| 2005 | 5,263 | |
| 2006 | 5,051 | |
| 2007 | 5,302 | |
| 2008 | 5,006 | |
| 2009 | 4,867 | |
| 2010 | 4,850 | |
| 2011 | 5,533 | 4,790 |
| 2012 | 5,678 | 4,830 |
| 2013 | 5,660 | 4,810 |
| 2014 | 5,643 | 4,700 |
| 2015 | 5,738 | 4,760 |
| 2016 | 5,532 | 4,760 |
| 2017 | 5,525 | 4,750 |
| 2018 | 5,328 | 4,880 |
| 2019 | 5,245 | 4,840 |
| 2020 | 5,080 | 4,830 |
| 2021 | 4,794 | 4,680 |
| 2022 | 4,855 | 4,880 |
| 2023 | 4,734 |
ACS: U.S. Census Bureau American Community Survey 5-year estimates. IRS: Statistics of Income ZIP Code data.
ZIP codes near 21791
12 nearest ZIP centroids (any distance)
- 21762Libertytown4.8 miPop 176 · Income —
- 21776New Windsor4.8 miPop 5,905 · Income $111,923
- 21757Keymar5.6 miPop 2,810 · Income $98,520
- 21798Woodsboro5.7 miPop 2,765 · Income $125,583
- 21793Walkersville8.8 miPop 10,914 · Income $128,504
- 21778Rocky Ridge9.4 miPop 840 · Income $110,489
- 21774New Market9.6 miPop 16,515 · Income $171,875
- 21771Mount Airy9.7 miPop 32,827 · Income $154,844
- 21701Frederick9.9 miPop 41,340 · Income $102,306
- 21787Taneytown10.0 miPop 11,549 · Income $88,212
- 21157Westminster11.0 miPop 40,191 · Income $102,835
- 21158Westminster11.7 miPop 22,404 · Income $108,795
ZIP centroids within 2 miles
No other ZIP codes within 2 miles of 21791, measured by Census internal-point centroids. Try a wider radius.
ZIPs within 2 miles of this place
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ZIP code 21791 FAQ
- What city is ZIP code 21791 in?
- 21791 is in Union Bridge, MD.
- What county is 21791 in?
- 21791 is in Carroll County.
- What is the median household income in 21791?
- The median household income in 21791 is $90,460.
- Which ZIP codes are near 21791?
- Use the radius tool on this page to list ZIP codes within a chosen distance of 21791.