What city is ZIP code 21555?

ZIP code 21555 is in Oldtown, MD (Allegany County).

What county is ZIP code 21555 in?

ZIP code 21555 is mostly in Allegany County, Maryland.

How many people live in ZIP code 21555?

About 1,470 people live in the 21555 ZIP Code Tabulation Area, based on American Community Survey 5-year estimates.

Checked Oct 26, 2026

ZIP Code 21555

Oldtown, MD, Allegany County

Population

1,470

Land area

98.3sq mi

People per sq mi

City

Oldtown

ZIP 21555 and nearby ZIP codes

Full map

ZIP 21555 at a glance

ZIP 21555 (Oldtown) is 98% less dense than Maryland as a whole.
The median household income is $53,266, 49% below the Maryland median of $103,678.
A typical owner-occupied home is valued at $197,700 (53% below Maryland) and median rent is $790 a month.

Local data for ZIP 21555

Counts from official public data

Housing and community stats

ZIP 21555, American Community Survey 2020-2024

Full profile

Median household income

$53,266

Poverty rate

22.1%

Median home value

$197,700

Median rent

$790/mo

Homeownership

82.4%

Bachelor's or higher

11.9%

Median age

42.6

Average commute

26.6 min

Income, education and commute

Economy and federal money

Businesses, pandemic loans and political donations

Details

Business establishments

ZIP Business Patterns 2023

Employees

$995K annual payroll

PPP loans

$103K

9 loans

Campaign donations

$310

100% D, 0% R, 2026 cycle

PPP loans in this ZIP

Environment and hazard risk

ZIP 21555, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: landslide

Storm events since 1996

1,095

Countywide, mostly winter weather

Flood insurance policies

135

0.5% of homes, county

July high / Jan low

87° / 23°F

39.2 inches of rain a year

Hazards, floods and storm history Check a flood zone

Health statistics

Share of adults in ZIP 21555, CDC PLACES estimates

All 40 measures

Obesity

36.5%

U.S. 33.3% +3.2 pts

Diabetes

14.3%

U.S. 12.1% +2.2 pts

Smoking

18.8%

U.S. 12.8% +6.0 pts

Uninsured (18-64)

8.7%

U.S. 11.1% -2.4 pts

Frequently asked questions

What city is ZIP code 21555?: ZIP code 21555 is in Oldtown, MD (Allegany County).
What county is ZIP code 21555 in?: ZIP code 21555 is mostly in Allegany County, Maryland.
How many people live in ZIP code 21555?: About 1,470 people live in the 21555 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.