What city is ZIP code 21648?

ZIP code 21648 is in Madison, MD (Dorchester County).

What county is ZIP code 21648 in?

ZIP code 21648 is mostly in Dorchester County, Maryland.

How many people live in ZIP code 21648?

About 172 people live in the 21648 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Checked Oct 26, 2026

ZIP Code 21648

Madison, MD, Dorchester County

Population

172

Land area

9.4sq mi

People per sq mi

City

Madison

ZIP 21648 and nearby ZIP codes

Full map

ZIP 21648 at a glance

ZIP 21648 (Madison) is 97% less dense than Maryland as a whole.

Local data for ZIP 21648

Counts from official public data

Restaurants2

Economy and federal money

Businesses, pandemic loans and political donations

Details

PPP loans

$233K

5 loans

PPP loans in this ZIP

Environment and hazard risk

ZIP 21648, 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

88° / 29°F

47.6 inches of rain a year

Hazards, floods and storm history Check a flood zone

Health statistics

Share of adults in ZIP 21648, CDC PLACES estimates

All 40 measures

Obesity

38.0%

U.S. 33.3% +4.7 pts

Diabetes

14.1%

U.S. 12.1% +2.0 pts

Smoking

14.1%

U.S. 12.8% +1.3 pts

Uninsured (18-64)

7.1%

U.S. 11.1% -4.0 pts

Frequently asked questions

What city is ZIP code 21648?: ZIP code 21648 is in Madison, MD (Dorchester County).
What county is ZIP code 21648 in?: ZIP code 21648 is mostly in Dorchester County, Maryland.
How many people live in ZIP code 21648?: About 172 people live in the 21648 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.