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 High-density area
- $82,721
- Median income Near-median income area
- $172,000
- Median home value Near-median home value
- 20.3%
- Bachelor's or higher Near-average bachelor's attainment
National ZIP placement
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 average Maryland ZIP), while per-capita income is $29,251. The poverty rate is 5.5%, with unemployment at 6.7%; those measures add context to the income figure. Home values sit below the statewide ZIP benchmark: the median is $172,000 (62% below the average Maryland ZIP), and median rent is $1,175; owner occupancy is 70.0%.
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 -. The page also surfaces 6 ZIP codes within roughly 10 miles and 6 more in Dorchester County, so 21664 can be compared with both its immediate and county-level context.
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
Who lives in ZIP 21664?
34.0
Median Age
46.8%
Male
53.2%
Female
11.0%
Foreign-Born
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 ZIP avg
$29,251
Per Capita Income
5.5%
Poverty Rate
6.7%
Unemployment Rate
How ZIP 21664 ranks among Maryland ZIPs
Secretary, MD household income vs. every Maryland ZIP code
Median household income among 419 reporting Maryland ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$82,721 25th percentile higher than 25% of 419 Maryland ZIPs
Each bar is a $20K-wide band; taller bars hold more Maryland 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
257housing units
257
Total Housing Units
217
Occupied Units
40
Vacant Units
2.93
Avg Household Size
Occupancy Type
$172,000
Median Home Value
-62% vs state ZIP avg
$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.
- 21613
Cambridge (21613)
17,330 residents
- 21643 5,979
Hurlock (21643)
5,979 residents
- 21655 5,009
Preston (21655)
5,009 residents
- 21673 3,136
Trappe (21673)
3,136 residents
- 21631 2,731
East New Market (21631)
2,731 residents
- 21664 539
Secretary (21664)
539 residents
- 21835 507
Linkwood (21835)
507 residents
What this shows Among its immediate neighbors, ZIP 21664 ranks #6 by population - useful context the national average alone can't give.
ZIP 21664 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 21655
Preston (21655)
$90,385 median income
- 21664
Secretary (21664)
$82,721 median income
- 21631
East New Market (21631)
$73,864 median income
- 21673
Trappe (21673)
$68,194 median income
- 21643
Hurlock (21643)
$67,219 median income
- 21613
Cambridge (21613)
$53,890 median income
- 21835
Linkwood (21835)
$47,083 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.
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 21664, both outside MD so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Dorchester County
Related Areas
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.
Related
Take this with you
What to do with ZIP 21664's numbers, next.
- See how ZIP 21664 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Secretary, MD ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.