What is the largest city in Cobb County, GA?

Mableton is the largest city or town in Cobb County, with about 77,678 residents.

How many ZIP codes are in Cobb County?

Cobb County includes 19 ZIP Code Tabulation Areas, including 30008, 30060, 30062, 30064, 30066.

What is the population of Cobb County, GA?

About 775,208 people live in Cobb County, based on American Community Survey 5-year estimates.

What counties border Cobb County?

Cobb County borders Fulton County, Cherokee County, Paulding County, Douglas County, Bartow County.

Cobb County, GA: Cities, ZIP Codes & Local Data

Population

775,208

Land area

340sq mi

People per sq mi

2,282

ZIP codes

19

Cobb County at a glance

Cobb County is about 12 times as dense as Georgia as a whole.
It is the 3rd most populous of 159 counties in Georgia.
Households here earn a median of $102,738 a year, 33% more than the Georgia figure of $77,353.
A typical owner-occupied home is valued at $407,200 (34% above Georgia) and median rent is $1,730 a month.
The biggest population centers are Mableton (77,678), Marietta (62,263) and Smyrna (56,633).

Local data for Cobb County, GA

Counts from official public data

Housing and community stats

Cobb County, GA, American Community Survey 2020-2024

Full profile

Median household income

$102,738

Poverty rate

8.7%

Median home value

$407,200

Prices +2.1% in a year

Median rent

$1,730/mo

Homeownership

67.0%

Bachelor's or higher

50.8%

Median age

37.5

Average commute

29.4 min

Largest reported origins and ancestries: German Americans (62,115), Irish Americans (60,324), Mexican Americans (55,506).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.3%

Sep 2026, +0.2 pts in a year

Average annual pay

$79,377

381,663 jobs, 2025

Income per person

$79,583

BEA, 2024

Federal spending

$5.1B

FY 2026, $6,693 per person

PPP loans

$2.4B

43,340 loans, 246,150 jobs reported

Campaign donations

$7.4M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Cobb County, GA, workers 16 and older. American Community Survey 5-year estimates

Drove alone64.8%
Carpooled7.7%
Public transit0.6%
Walked1.1%
Bicycle0.0%
Taxi, ride-hailing, motorcycle or other2.3%
Worked from home23.6%

Average one-way commute: 29.4 minutes for people who do not work from home.

Environment and hazard risk

Cobb County, GA, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively High

Top: tornado

Storm events since 1996

650

Most often thunderstorm wind

Flood insurance policies

2,144

1.0% of homes, county

July high / Jan low

84° / 32°F

56.2 inches of rain a year

Hazards, floods and storm history Check a flood zone 21 historic places

Health statistics

Share of adults in Cobb County, GA, CDC PLACES estimates

All 40 measures

Obesity

29.9%

U.S. 33.3% -3.4 pts

Diabetes

10.9%

U.S. 12.1% -1.2 pts

Smoking

10.4%

U.S. 12.8% -2.4 pts

Uninsured (18-64)

10.7%

U.S. 11.1% about the same

Cities, towns and ZIP codes in Cobb County

Population shown

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Frequently asked questions

What is the largest city in Cobb County, GA?: Mableton is the largest city or town in Cobb County, with about 77,678 residents.
How many ZIP codes are in Cobb County?: Cobb County includes 19 ZIP Code Tabulation Areas, including 30008, 30060, 30062, 30064, 30066.
What is the population of Cobb County, GA?: About 775,208 people live in Cobb County, based on American Community Survey 5-year estimates.
What counties border Cobb County?: Cobb County borders Fulton County, Cherokee County, Paulding County, Douglas County, Bartow County.