ZIP Code Tabulation Area · Maryland

ZIP Code 21788: Frederick County, MD

ZIP Code 21788 (Frederick County, Maryland) has an estimated 11,654 residents in 4,649 households. The median household income is $98,856, the median home value is $379,200 and the median gross rent is $959/mo. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated

Total population

11,654

Margin of error ±906

Median household income

$98,856

Margin of error ±$4,529

Median home value

$379,200

Margin of error ±$14,926

Median gross rent

$959/mo

Margin of error ±$109

Median age

44.6 yrs

Margin of error ±3.3 yrs

Mean travel time to work

28.7 min

Margin of error ±4.9 min

How ZIP 21788 compares with Maryland and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 2178844.6 yrsMaryland39.4 yrsUnited States38.9 yrs

Median household income

ZIP 21788$98,856Maryland$103,678United States$80,734

Per capita income

ZIP 21788$52,036Maryland$52,979United States$44,673

Poverty rate

ZIP 217888.6%Maryland9.4%United States12.5%

Unemployment rate

ZIP 217882.8%Maryland4.9%United States5.2%

Bachelor's degree or higher

ZIP 2178831.3%Maryland43.4%United States35.7%

Median home value

ZIP 21788$379,200Maryland$419,900United States$332,700

Median gross rent

ZIP 21788$959/moMaryland$1,705/moUnited States$1,413/mo

Owner-occupied homes

ZIP 2178882.1%Maryland67.6%United States65.2%

Mean travel time to work

ZIP 2178828.7 minMaryland31.1 minUnited States26.4 min

Worked from home

ZIP 2178816.0%Maryland19.3%United States15.1%

All figures for ZIP 21788

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 21788 — ACS 2020–2024 5-year estimates
MeasureZIP 21788Margin of errorMarylandUnited States
Total population11,654±9066,206,011334,922,499
Median age44.6 yrs±3.3 yrs39.4 yrs38.9 yrs
Households4,649±3402,362,928129,227,496
Median household income$98,856±$4,529$103,678$80,734
Per capita income$52,036±$4,957$52,979$44,673
Poverty rate8.6%±2.4 pts9.4%12.5%
Unemployment rate2.8%±1.6 pts4.9%5.2%
Bachelor's degree or higher31.3%±4.5 pts43.4%35.7%
Median home value$379,200±$14,926$419,900$332,700
Median gross rent$959/mo±$109$1,705/mo$1,413/mo
Owner-occupied homes82.1%±4.7 pts67.6%65.2%
Mean travel time to work28.7 min±4.9 min31.1 min26.4 min
Worked from home16.0%±2.4 pts19.3%15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 21788
GroupZIP 21788MarylandUnited States
White alone, not Hispanic or Latino89.7%46.6%57.4%
Black or African American alone, not Hispanic or Latino0.9%28.9%11.9%
American Indian and Alaska Native alone, not Hispanic or Latino0.0%0.1%0.5%
Asian alone, not Hispanic or Latino1.4%6.5%5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino0.1%0.0%0.2%
Some other race alone, not Hispanic or Latino0.1%0.7%0.6%
Two or more races, not Hispanic or Latino2.5%4.6%4.3%
Hispanic or Latino (of any race)5.4%12.5%19.3%

Where ZIP 21788 is

State
Maryland
Main county
Frederick County
Largest overlapping place
Thurmont (5% of the ZIP's land area)
Land area
65.44 sq mi· about 178 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Frederick County

21704 Frederick County, MD21705 Frederick, MD21710 Frederick County, MD21714 Braddock Heights, MD21716 Brunswick, MD21717 Buckeystown, MD21718 Burkittsville, MD21727 Frederick County, MD21754 Frederick County, MD21755 Frederick County, MD21758 Frederick County, MD21762 Libertytown, MD21769 Frederick County, MD21770 Green Valley, MD21771 Frederick County, MD21773 Frederick County, MD21774 Linganore, MD21777 Point of Rocks, MD21778 Frederick County, MD21780 Frederick County, MD21790 Frederick County, MD21791 Frederick County, MD21793 Walkersville, MD21798 Frederick County, MD

See every ZIP code in Maryland, or compare ZIP 21788 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

  • U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
  • U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
  • Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.