ZIP Code Tabulation Area · Maryland

ZIP Code 21784: Eldersburg, MD

ZIP Code 21784 (Eldersburg, Carroll County, Maryland) has an estimated 39,258 residents in 13,416 households. The median household income is $139,395, the median home value is $491,800 and the median gross rent is $1,739/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

Total population

39,258

Margin of error ±1,378

Median household income

$139,395

Margin of error ±$6,461

Median home value

$491,800

Margin of error ±$10,009

Median gross rent

$1,739/mo

Margin of error ±$110

Median age

38.9 yrs

Margin of error ±1.0 yrs

Mean travel time to work

33.3 min

Margin of error ±2.6 min

How ZIP 21784 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 2178438.9 yrsMaryland39.4 yrsUnited States38.9 yrs

Median household income

ZIP 21784$139,395Maryland$103,678United States$80,734

Per capita income

ZIP 21784$56,974Maryland$52,979United States$44,673

Poverty rate

ZIP 217844.4%Maryland9.4%United States12.5%

Unemployment rate

ZIP 217843.7%Maryland4.9%United States5.2%

Bachelor's degree or higher

ZIP 2178453.0%Maryland43.4%United States35.7%

Median home value

ZIP 21784$491,800Maryland$419,900United States$332,700

Median gross rent

ZIP 21784$1,739/moMaryland$1,705/moUnited States$1,413/mo

Owner-occupied homes

ZIP 2178487.3%Maryland67.6%United States65.2%

Mean travel time to work

ZIP 2178433.3 minMaryland31.1 minUnited States26.4 min

Worked from home

ZIP 2178421.5%Maryland19.3%United States15.1%

All figures for ZIP 21784

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 21784 — ACS 2020–2024 5-year estimates
Measure	ZIP 21784	Margin of error	Maryland	United States
Total population	39,258	±1,378	6,206,011	334,922,499
Median age	38.9 yrs	±1.0 yrs	39.4 yrs	38.9 yrs
Households	13,416	±454	2,362,928	129,227,496
Median household income	$139,395	±$6,461	$103,678	$80,734
Per capita income	$56,974	±$2,603	$52,979	$44,673
Poverty rate	4.4%	±1.3 pts	9.4%	12.5%
Unemployment rate	3.7%	±1.3 pts	4.9%	5.2%
Bachelor's degree or higher	53.0%	±2.4 pts	43.4%	35.7%
Median home value	$491,800	±$10,009	$419,900	$332,700
Median gross rent	$1,739/mo	±$110	$1,705/mo	$1,413/mo
Owner-occupied homes	87.3%	±1.5 pts	67.6%	65.2%
Mean travel time to work	33.3 min	±2.6 min	31.1 min	26.4 min
Worked from home	21.5%	±2.3 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 21784
Group	ZIP 21784	Maryland	United States
White alone, not Hispanic or Latino	77.0%	46.6%	57.4%
Black or African American alone, not Hispanic or Latino	6.6%	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	4.1%	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	1.0%	0.7%	0.6%
Two or more races, not Hispanic or Latino	4.4%	4.6%	4.3%
Hispanic or Latino (of any race)	6.8%	12.5%	19.3%

Where ZIP 21784 is

State: Maryland
Main county: Carroll County— also overlaps Howard County
Largest overlapping place: Eldersburg (59% of the ZIP's land area)
Land area: 56.13 sq mi· about 699 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 Carroll County

21048 Carroll County, MD 21074 Carroll County, MD 21102 Carroll County, MD 21157 Carroll County, MD 21158 Carroll County, MD 21757 Carroll County, MD 21776 Carroll County, MD 21787 Carroll County, MD

See every ZIP code in Maryland, or compare ZIP 21784 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.