What city is ZIP code 21664?

ZIP code 21664 is in Secretary, MD (Dorchester County).

What county is ZIP code 21664 in?

ZIP code 21664 is mostly in Dorchester County, Maryland.

How many people live in ZIP code 21664?

About 635 people live in the 21664 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Checked Oct 26, 2026

ZIP Code 21664

Secretary, MD, Dorchester County

Population

635

Land area

0.3sq mi

People per sq mi

2,180

City

Secretary

ZIP 21664 and nearby ZIP codes

Full map

ZIP 21664 at a glance

ZIP 21664 (Secretary) is about 3.4 times as dense as Maryland as a whole.
Households here earn a median of $82,721 a year, 20% less than the Maryland figure of $103,678.
A typical owner-occupied home is valued at $172,000 (59% below Maryland) and median rent is $1,175 a month.

Local data for ZIP 21664

Counts from official public data

Housing and community stats

ZIP 21664, American Community Survey 2020-2024

Full profile

Median household income

$82,721

Poverty rate

5.5%

Median home value

$172,000

Median rent

$1,175/mo

Homeownership

70.0%

Bachelor's or higher

20.3%

Median age

34.0

Average commute

25.4 min

Income, education and commute

Economy and federal money

Businesses, pandemic loans and political donations

Details

Business establishments

ZIP Business Patterns 2023

Employees

$3M annual payroll

PPP loans

$138K

8 loans

Campaign donations

$100

Itemized, 2026 cycle

PPP loans in this ZIP

Environment and hazard risk

ZIP 21664, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: coastal flooding

Storm events since 1996

430

Countywide, mostly thunderstorm wind

Flood insurance policies

1,382

8.8% of homes, county

July high / Jan low

90° / 28°F

Hazards, floods and storm history Check a flood zone

Health statistics

Share of adults in ZIP 21664, CDC PLACES estimates

All 40 measures

Obesity

37.1%

U.S. 33.3% +3.8 pts

Diabetes

12.4%

U.S. 12.1% about the same

Smoking

14.1%

U.S. 12.8% +1.3 pts

Uninsured (18-64)

8.9%

U.S. 11.1% -2.2 pts

Frequently asked questions

What city is ZIP code 21664?: ZIP code 21664 is in Secretary, MD (Dorchester County).
What county is ZIP code 21664 in?: ZIP code 21664 is mostly in Dorchester County, Maryland.
How many people live in ZIP code 21664?: About 635 people live in the 21664 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Source: U.S. Census Bureau (ZIP Code Tabulation Areas, American Community Survey) · Data as of 12/31/2023. ZIP Code Tabulation Areas closely match, but are not identical to, USPS ZIP code delivery areas.