PlainZIP

Henderson, MD · standard

ZIP Code 21640

Caroline County, Maryland - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

1,632
23/sq mi
$53,558
Median income
$268,500
Median home value
13.9%
Bachelor's or higher

The verdict

Henderson pairs one of the lowest household incomes in the country with above-median home values, in a rural, homeowner-dominated area.

19th pct
household income, US ZIPs
Top 39%
home value, US ZIPs
23
people per sq mi
92%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 21640 against every reporting US ZIP.

ZIP code 21640 covers 71.6 square miles in Henderson, Caroline County, Maryland (a standard USPS delivery area), with a modest 1,632 residents on file, a density of 23 people per square mile, in the New York time zone.

ZIP 21640 reports a modest median household income of $53,558 (53% below the Maryland average), while per-capita income is $30,254. Local economic indicators show a 7.2% poverty rate alongside 2.1% unemployment. The typical home here is valued at $268,500 (40% below the state average); renters pay a median of - monthly, and 92.4% of units are owner-occupied.

Formal educational attainment runs low here: just 13.9% of adults hold a bachelor's degree or higher, the median age is 39.9, and the average commute is -. A geography-based comparison follows: 10 ZIP codes within about 10 miles of 21640, plus 6 more within Caroline County, give a clearer read than the national average alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 21640, Henderson, MD · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

1,632

Population

71.6

Area (sq mi)

23

People / sq mi

New York

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 21640?

39.9

Median Age

48.1%

Male

51.9%

Female

7.1%

Foreign-Born

White 79.7%
African American 0.0%
Asian 0.2%
American Indian or Alaska Native 7.4%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 4.7%
Hispanic or Latino 20.9%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$53,558

Median Household Income

-53% vs state

$30,254

Per Capita Income

7.2%

Poverty Rate

2.1%

Unemployment Rate

How ZIP 21640 ranks nationally

Henderson, MD household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$53,558 19th percentile higher than 19% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). This entry sits in this band. $60,000–$80,000: 9,980 US ZIPs (33%). Above this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 66.2%
Bachelor's Degree or Higher 13.9%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

531

Total Housing Units

511

Occupied Units

20

Vacant Units

2.28

Avg Household Size

Occupancy Type

Owner 92.4%
Renter 7.6%

$268,500

Median Home Value

-40% vs state

1986

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 11 business establishments in ZIP 21640, employing approximately 65 people with a combined annual payroll of $1,986,000.

11

Businesses

65

Employees

$2.0M

Annual Payroll

1

Industry Sectors

Industry Establishments % of Total
Real estate and rental and leasing 3 27.3%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 21640 vs 21636 →

ZIP 21640 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 21640 ranks #7 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 21640 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 21640 ranks #null of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
21636 Goldsboro, MD 1,186 3.2 mi
21644 Ingleside, MD 111 4.2 mi
21607 Barclay, MD 583 4.8 mi
21649 Marydel, MD 1,858 5.2 mi
19964 Marydel, DE 1,340 5.3 mi
21639 Greensboro, MD 4,408 7.3 mi
21668 Sudlersville, MD 1,904 8.5 mi
21660 Ridgely, MD 4,063 8.7 mi
21623 Church Hill, MD 2,111 8.5 mi
19953 Hartly, DE 4,386 8.6 mi

More ZIP Codes in Caroline County

21629 standard
Denton, MD
Pop: 9,555
21632 standard
Federalsburg, MD
Pop: 6,353
21655 standard
Preston, MD
Pop: 5,009
21639 standard
Greensboro, MD
Pop: 4,408
21660 standard
Ridgely, MD
Pop: 4,063
21649 standard
Marydel, MD
Pop: 1,858

Related Areas

Caroline County Henderson, MD Maryland

Frequently Asked Questions

What county is ZIP code 21640 in? ▼
ZIP code 21640 (Henderson) is located in Caroline County, Maryland. Caroline County contains multiple ZIP codes, see the full list at /counties/caroline-md.
What is the population of ZIP code 21640? ▼
ZIP code 21640 in Henderson, MD has a population of 1,632 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 21640? ▼
The median household income in ZIP 21640 is $53,558, which is 30% below the national average of $76,288.
What is the average home value in ZIP 21640? ▼
The median home value in ZIP 21640 is $268,500, which is 3% below the national average of $278,155.
What is the demographic makeup of ZIP 21640? ▼
The largest racial group in ZIP 21640 is White at 79.7%. Hispanic or Latino residents make up 20.9% of the population.
How many businesses are in ZIP code 21640? ▼
ZIP code 21640 has 11 business establishments employing approximately 65 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 21640? ▼
In ZIP code 21640, 66.2% of residents aged 25+ have a high school diploma or higher, and 13.9% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 21640? ▼
In ZIP code 21640, approximately 92.4% of occupied housing units are owner-occupied and 7.6% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 21640? ▼
The poverty rate in ZIP code 21640 is 7.2% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.