PlainZIP

Secretary, MD · standard

ZIP Code 21664

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

539
481/sq mi
$82,721
Median income
$172,000
Median home value
20.3%
Bachelor's or higher

The verdict

Secretary pairs an above-median household income with below-median home values, in a low-density, homeowner-dominated area.

Top 35%
household income, US ZIPs
35th pct
home value, US ZIPs
481
people per sq mi
70%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 21664 against every reporting US ZIP.

ZIP code 21664 is a sparsely populated ZIP (a standard USPS delivery area) in Secretary, Dorchester County, Maryland, home to just 539 residents across 1.1 square miles, a density of 481 people per square mile, in the New York time zone.

ZIP 21664 lands in the middle-income range, with a median household income of $82,721 (28% below the Maryland average), while per-capita income is $29,251. 5.5% of residents live below the poverty line, and the unemployment rate reads 6.7%. On housing, the median home value is $172,000 (62% below the state average) with median rent at $1,175 per month, and 70.0% of occupied units are owner-occupied.

Educational attainment sits below the national norm: 20.3% of adults hold a bachelor's degree or higher, the median age is 34, and the average commute is -. We also surface 6 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Dorchester County, so you can benchmark 21664 against its immediate geography rather than a 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 21664, Secretary, 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

539

Population

1.1

Area (sq mi)

481

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 21664?

34.0

Median Age

46.8%

Male

53.2%

Female

11.0%

Foreign-Born

White 73.2%
African American 1.1%
Asian 0.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.9%
Two or More Ethnicities 8.2%
Hispanic or Latino 21.4%

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?

$82,721

Median Household Income

-28% vs state

$29,251

Per Capita Income

5.5%

Poverty Rate

6.7%

Unemployment Rate

How ZIP 21664 ranks nationally

Secretary, MD household income vs. every US ZIP code

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

$82,721 Top 35% higher than 65% 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%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). This entry sits in this band. $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 67.6%
Bachelor's Degree or Higher 20.3%

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

What does housing look like?

257

Total Housing Units

217

Occupied Units

40

Vacant Units

2.93

Avg Household Size

Occupancy Type

Owner 70.0%
Renter 30.0%

$172,000

Median Home Value

-62% vs state

$1,175

Median Rent

1973

Median Year Built

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

What businesses operate in this ZIP?

Census Bureau data shows 12 business establishments in ZIP 21664, employing approximately 58 people with a combined annual payroll of $2,969,000.

12

Businesses

58

Employees

$3.0M

Annual Payroll

2

Industry Sectors

Industry Establishments % of Total
Construction 3 25.0%
Other services (except public administration) 3 25.0%

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 21664 vs 21631 →

ZIP 21664 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 21664 ranks #6 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 21664 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 21664 ranks #2 of 7 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
21631 East New Market, MD 2,731 1.4 mi
21835 Linkwood, MD 507 5.1 mi
21643 Hurlock, MD 5,979 4.9 mi
21673 Trappe, MD 3,136 6.0 mi
21655 Preston, MD 5,009 9.6 mi
21613 Cambridge, MD 17,330 10.5 mi

More ZIP Codes in Dorchester County

21613 standard
Cambridge, MD
Pop: 17,330
21643 standard
Hurlock, MD
Pop: 5,979
21631 standard
East New Market, MD
Pop: 2,731
21659 standard
Rhodesdale, MD
Pop: 1,551
21869 standard
Vienna, MD
Pop: 1,006
21622 standard
Church Creek, MD
Pop: 558

Related Areas

Dorchester County Secretary, MD Maryland

Frequently Asked Questions

What county is ZIP code 21664 in? ▼
ZIP code 21664 (Secretary) is located in Dorchester County, Maryland. Dorchester County contains multiple ZIP codes, see the full list at /counties/dorchester-md.
What is the population of ZIP code 21664? ▼
ZIP code 21664 in Secretary, MD has a population of 539 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 21664? ▼
The median household income in ZIP 21664 is $82,721, which is 8% above the national average of $76,288.
What is the average home value in ZIP 21664? ▼
The median home value in ZIP 21664 is $172,000, which is 38% below the national average of $278,155.
What is the demographic makeup of ZIP 21664? ▼
The largest racial group in ZIP 21664 is White at 73.2%. Hispanic or Latino residents make up 21.4% of the population.
How many businesses are in ZIP code 21664? ▼
ZIP code 21664 has 12 business establishments employing approximately 58 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 21664? ▼
In ZIP code 21664, 67.6% of residents aged 25+ have a high school diploma or higher, and 20.3% 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 21664? ▼
In ZIP code 21664, approximately 70.0% of occupied housing units are owner-occupied and 30.0% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 21664? ▼
The poverty rate in ZIP code 21664 is 5.5% 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.