Cobb Island, MD · standard

ZIP Code 20625

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

Reviewed by PlainZIP Editorial Team, ZIP Code Data Editors · June 13, 2026

1,062
830/sq mi: $245,300
Median home value: 2.4%
Bachelor's or higher

The verdict

Cobb Island pairs above-median home values, in a low-density, homeowner-dominated area.

Top 44%
home value, US ZIPs: 830
people per sq mi: 100%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 20625 against every reporting US ZIP.

ZIP code 20625 is classified by USPS as a standard delivery area and covers roughly 1.3 square miles in Cobb Island, Charles County, Maryland. The area is home to 1,062 residents, producing a population density of 830 people per square mile, and falls within the New York time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 20625 against Maryland and the nation.

On the economic side, the median household income for ZIP 20625 sits at —, while per-capita income is $49,865. The poverty rate stands at 2.5% and the unemployment rate at 0.0%. On housing, the median home value is $245,300 (45% below the state average) with median rent at — per month, and 100.0% of occupied units are owner-occupied, a direct signal of whether 20625 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 2.4% of adults hold a bachelor's degree or higher, the median age is 45.8, and the average commute is —. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Charles County, so you can benchmark 20625 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + HUD FMR + FHFA HPI ACS demographics, ZBP business establishments, HUD Fair Market Rents, FHFA HPI for ZIP 20625, Cobb Island, MD · 2023 Accessed 2026-06-13 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; HUD FMR + FHFA HPI updated quarterly/annually.

Quick Facts

1,062

Population

1.3

Area (sq mi)

830

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 20625?

45.8

Median Age

54.3%

Male

45.7%

Female

2.4%

Foreign-Born

White 91.4%

African American 0.0%

Asian 2.4%

American Indian or Alaska Native 0.0%

Native Hawaiian or Pacific Islander 0.0%

Two or More Ethnicities 6.2%

Hispanic or Latino 0.0%

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?

$49,865

Per Capita Income

2.5%

Poverty Rate

0.0%

Unemployment Rate

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

What is the education profile here?

High School Graduate or Higher 68.1%

Bachelor's Degree or Higher 2.4%

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

What does housing look like?

515

Total Housing Units

328

Occupied Units

187

Vacant Units

2.59

Avg Household Size

Occupancy Type

Owner 100.0%

Renter 0.0%

$245,300

Median Home Value

-45% vs state

1938

Median Year Built

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

How have home values changed over time?

FHFA House Price Index, annual appreciation data based on repeat sales and appraisals

+14.0%

YoY Change (2024)

241

HPI Index (2000 = 100)

+141%

Total Change Since 2000

Home values in ZIP 20625 have increased 14.0% over the past year (2024). Since 2000, this ZIP has seen +141% cumulative appreciation.

Year	Annual Change	HPI Index
2018	+10.0%	201
2019	+6.6%	214
2020	-8.4%	196
2021	+14.0%	224
2024	—	241

Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 11 business establishments in ZIP 20625, employing approximately 75 people with a combined annual payroll of $2,481,000.

Businesses

Employees

$2.5M

Annual Payroll

Industry Sectors

Industry	Establishments	% of Total
Accommodation and food services	6	54.5%

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 20625 vs 20618 →

22443

8,083
22520

5,402
20664

2,987
20621

1,373
20624

1,282
20609

1,120
20625

1,062
20645

857
20618

607

What this shows Among its immediate neighbors, ZIP 20625 ranks #7 by population — useful context the national average alone can't give.

ZIP Code	City	Population	Distance
20618	Bushwood, MD	607	3.4 mi
20645	Issue, MD	857	3.9 mi
20609	Avenue, MD	1,120	5.1 mi
20606	Abell, MD	431	6.0 mi
20626	Coltons Point, MD	373	5.2 mi
20621	Chaptico, MD	1,373	5.5 mi
20664	Newburg, MD	2,987	7.4 mi
20624	Clements, MD	1,282	7.9 mi
22520	Montross, VA	5,402	10.3 mi
22443	Colonial Beach, VA	8,083	9.9 mi

More ZIP Codes in Charles County

Charles County Cobb Island, MD Maryland

Frequently Asked Questions

What county is ZIP code 20625 in? ▼

ZIP code 20625 (Cobb Island) is located in Charles County, Maryland. Charles County contains multiple ZIP codes, see the full list at /counties/charles-md.

What is the population of ZIP code 20625? ▼

ZIP code 20625 in Cobb Island, MD has a population of 1,062 according to the Census Bureau ACS 2023 estimates.

What is the average home value in ZIP 20625? ▼

The median home value in ZIP 20625 is $245,300, which is 12% below the national average of $278,155.

What is the demographic makeup of ZIP 20625? ▼

The largest racial group in ZIP 20625 is White at 91.4%.

How many businesses are in ZIP code 20625? ▼

ZIP code 20625 has 11 business establishments employing approximately 75 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.

How have home values changed in ZIP code 20625? ▼

According to the FHFA House Price Index, home values in ZIP 20625 increased by 14.0% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 141%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.

What is the education level in ZIP code 20625? ▼

In ZIP code 20625, 68.1% of residents aged 25+ have a high school diploma or higher, and 2.4% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).

What is the poverty rate in ZIP code 20625? ▼

The poverty rate in ZIP code 20625 is 2.5% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.