ZIP Code Tabulation Area · Maryland

ZIP Code 21640: Caroline County, MD

ZIP Code 21640 (Caroline County, Maryland) has an estimated 1,163 residents in 511 households. The median household income is $53,558, the median home value is $268,500 and the median gross rent is —. 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. One figure for this ZIP (home value) is marked with *. ACS figures come from a sample, and small areas have fewer responses, so treat these numbers as rough ranges.

Total population

1,163

Margin of error ±220

Median household income

$53,558

Margin of error ±$10,703

Median home value

$268,500*

Margin of error ±$146,831· estimate has a large margin of error

Median gross rent

—

Margin of error not available

Median age

39.9 yrs

Margin of error ±13.5 yrs

Mean travel time to work

36.0 min

Margin of error ±15.7 min

How ZIP 21640 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 2164039.9 yrsMaryland39.4 yrsUnited States38.9 yrs

Median household income

ZIP 21640$53,558Maryland$103,678United States$80,734

Per capita income

ZIP 21640$30,254Maryland$52,979United States$44,673

Poverty rate

ZIP 216407.2%Maryland9.4%United States12.5%

Unemployment rate

ZIP 216402.1%Maryland4.9%United States5.2%

Bachelor's degree or higher

ZIP 2164013.9%Maryland43.4%United States35.7%

Median home value

ZIP 21640$268,500*Maryland$419,900United States$332,700

Median gross rent

ZIP 21640—Maryland$1,705/moUnited States$1,413/mo

Owner-occupied homes

ZIP 2164092.4%Maryland67.6%United States65.2%

Mean travel time to work

ZIP 2164036.0 minMaryland31.1 minUnited States26.4 min

Worked from home

ZIP 216401.7%Maryland19.3%United States15.1%

All figures for ZIP 21640

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 21640 — ACS 2020–2024 5-year estimates
Measure	ZIP 21640	Margin of error	Maryland	United States
Total population	1,163	±220	6,206,011	334,922,499
Median age	39.9 yrs	±13.5 yrs	39.4 yrs	38.9 yrs
Households	511	±106	2,362,928	129,227,496
Median household income	$53,558	±$10,703	$103,678	$80,734
Per capita income	$30,254	±$5,277	$52,979	$44,673
Poverty rate	7.2%	±4.8 pts	9.4%	12.5%
Unemployment rate	2.1%	±3.4 pts	4.9%	5.2%
Bachelor's degree or higher	13.9%	±6.9 pts	43.4%	35.7%
Median home value	$268,500*	±$146,831	$419,900	$332,700
Median gross rent	—	—	$1,705/mo	$1,413/mo
Owner-occupied homes	92.4%	±5.6 pts	67.6%	65.2%
Mean travel time to work	36.0 min	±15.7 min	31.1 min	26.4 min
Worked from home	1.7%	±2.1 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 21640
Group	ZIP 21640	Maryland	United States
White alone, not Hispanic or Latino	78.1%	46.6%	57.4%
Black or African American alone, not Hispanic or Latino	0.0%	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	1.0%	4.6%	4.3%
Hispanic or Latino (of any race)	20.9%	12.5%	19.3%

Where ZIP 21640 is

State: Maryland
Main county: Caroline County— also overlaps Queen Anne's County
Largest overlapping place: Henderson (less than 1% of the ZIP's land area)
Land area: 25.66 sq mi· about 45 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 Caroline County

21629 Caroline County, MD 21632 Caroline County, MD 21636 Caroline County, MD 21639 Caroline County, MD 21641 Hillsboro, MD 21655 Caroline County, MD 21660 Caroline County, MD

See every ZIP code in Maryland, or compare ZIP 21640 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.