ZIP Code Tabulation Area · Maryland

ZIP Code 21555: Allegany County, MD

ZIP Code 21555 (Allegany County, Maryland) has an estimated 1,470 residents in 591 households. The median household income is $53,266, the median home value is $197,700 and the median gross rent is $790/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 Oct 26, 2026

Some estimates have a large margin of error. 2 figures for this ZIP (poverty rate, owner-occupied) are marked with *. ACS figures come from a sample, and small areas have fewer responses, so treat these numbers as rough ranges.

Total population

1,470

Margin of error ±376

Median household income

$53,266

Margin of error ±$23,350

Median home value

$197,700

Margin of error ±$64,476

Median gross rent

$790/mo

Margin of error ±$114

Median age

42.6 yrs

Margin of error ±14.9 yrs

Mean travel time to work

26.6 min

Margin of error ±11.0 min

How ZIP 21555 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 2155542.6 yrsMaryland39.4 yrsUnited States38.9 yrs

Median household income

ZIP 21555$53,266Maryland$103,678United States$80,734

Per capita income

ZIP 21555$24,708Maryland$52,979United States$44,673

Poverty rate

ZIP 2155522.1%*Maryland9.4%United States12.5%

Unemployment rate

ZIP 215557.6%Maryland4.9%United States5.2%

Bachelor's degree or higher

ZIP 2155511.9%Maryland43.4%United States35.7%

Median home value

ZIP 21555$197,700Maryland$419,900United States$332,700

Median gross rent

ZIP 21555$790/moMaryland$1,705/moUnited States$1,413/mo

Owner-occupied homes

ZIP 2155582.4%*Maryland67.6%United States65.2%

Mean travel time to work

ZIP 2155526.6 minMaryland31.1 minUnited States26.4 min

Worked from home

ZIP 215557.0%Maryland19.3%United States15.1%

All figures for ZIP 21555

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 21555 — ACS 2020–2024 5-year estimates
Measure	ZIP 21555	Margin of error	Maryland	United States
Total population	1,470	±376	6,206,011	334,922,499
Median age	42.6 yrs	±14.9 yrs	39.4 yrs	38.9 yrs
Households	591	±185	2,362,928	129,227,496
Median household income	$53,266	±$23,350	$103,678	$80,734
Per capita income	$24,708	±$4,625	$52,979	$44,673
Poverty rate	22.1%*	±15.7 pts	9.4%	12.5%
Unemployment rate	7.6%	±7.4 pts	4.9%	5.2%
Bachelor's degree or higher	11.9%	±4.8 pts	43.4%	35.7%
Median home value	$197,700	±$64,476	$419,900	$332,700
Median gross rent	$790/mo	±$114	$1,705/mo	$1,413/mo
Owner-occupied homes	82.4%*	±14.9 pts	67.6%	65.2%
Mean travel time to work	26.6 min	±11.0 min	31.1 min	26.4 min
Worked from home	7.0%	±5.1 pts	19.3%	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 21555
Group	ZIP 21555	Maryland	United States
White alone, not Hispanic or Latino	98.9%	46.6%	57.4%
Black or African American alone, not Hispanic or Latino	0.5%	28.9%	11.9%
American Indian and Alaska Native alone, not Hispanic or Latino	0.0%	0.1%	0.5%
Asian alone, not Hispanic or Latino	0.0%	6.5%	5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino	0.0%	0.0%	0.2%
Some other race alone, not Hispanic or Latino	0.0%	0.7%	0.6%
Two or more races, not Hispanic or Latino	0.6%	4.6%	4.3%
Hispanic or Latino (of any race)	0.0%	12.5%	19.3%

Where ZIP 21555 is

State: Maryland
Main county: Allegany County
Largest overlapping place: Oldtown (less than 1% of the ZIP's land area)
Land area: 98.29 sq mi· about 15 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 Allegany County

21502 Allegany County, MD 21524 Allegany County, MD 21529 Ellerslie, MD 21530 Allegany County, MD 21532 Allegany County, MD 21540 Luke, MD 21542 Midland, MD 21543 Allegany County, MD 21545 Allegany County, MD 21557 Allegany County, MD 21766 Allegany County, MD

See every ZIP code in Maryland, or compare ZIP 21555 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.