21640 ZIP Code Profile, Map, Data & Demographics

ZIP Code Type: STANDARD
County: Caroline County
Centroid: Latitude 39.069, Longitude -75.815
Time Zone: Eastern Time Zone (UTC -5 hours)
Observes DST: Yes

ZIP Code 21640 has segments in 2 Counties / Independent Cities (Caroline, Queen Annes).

Businesses Addresses: 12
PO Box Addresses: 15
Residential Addresses: 599

Multi-Family Addresses: 0
Single Family Addresses: 599

The ZIP Code maps and database are updated 4 times per year.
Database updated: June 1, 2025, Maps updated: May 1, 2024.

Henderson, MD 21640 Data & Demographics (As of July 1, 2025)

POPULATION
Total Population	1,935 (100%)
Population in Households	1,924 (99.4%)
Population in Families	1,643 (84.9%)
Population in Group Quarters¹	11 ( 0.6%)
Population Density	67
Diversity Index²	77


INCOME
Median Household Income	$67,570
Average Household Income	$73,946
% of Income for Mortgage⁴	18%
Per Capita Income	$23,026
Wealth Index⁵	49
Socioeconomic Status Index⁶	Low (41.3)

HOUSING
Total HU (Housing Units)	648 (100%)
Owner Occupied HU	441 (68.1%)
Renter Occupied HU	161 (24.8%)
Vacant Housing Units	46 ( 7.1%)
Median Home Value	$197,500
Average Home Value	$233,010
Housing Affordability Index³	129

HOUSEHOLDS
Total Households	602
Average Household Size	3.20
Family Households	479
Average Family Size	3.00

NOTES

Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.
The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.

Henderson, MD 21640 - Peer Comparisons by Rank and Percentile

The table below compares 21640 to the other 458 ZIP Codes in Maryland by rank and percentile using July 1, 2025 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

GROWTH RATE / YEAR	2020-2025	2025-2030
Population	0.33%	-0.04%
Households	-0.16%	0.00%
Families		-0.55%
Median Household Income		0.89%
Per Capita Income		1.12%
Owner Occupied HU		0.00%

Variable Description	Rank	Percentile
Total Population	# 314	32nd
Population Density	# 388	16th
Median Household Income	# 391	15th
Housing Affordability Index	# 447	98th
Per Capita Income	# 446	3rd
Diversity Index	# 49	90th

21640 ZIP Code Profile, Map, Data & Demographics

ZIP Code 21640: Basic Data & USPS Preferred City Name

Henderson, MD 21640 Data & Demographics (As of July 1, 2025)

POPULATION

INCOME

HOUSING

HOUSEHOLDS

GROWTH RATE / YEAR

Henderson, MD 21640 - Peer Comparisons by Rank and Percentile

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