County Maps US

Cobb County, Georgia

A county in Georgia, ranked 3 of 159 by population.

CountyFIPS 13067

Within Georgia
Cobb County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Marietta, the county seat, located via the 2025 Census Gazetteer.

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Population
793,345
+26,960 (+3.5%) since 2020
Land area
339.7
square miles. A further 1.3% of the total area is water
Population density
2,335
people per square mile, computed rather than published
County seat
Marietta
Seat of county government.
Established
1832
193 years ago
Largest city
Mableton city
Population 78,820.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Cobb County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Cobb County, Georgia from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 726 by 800 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Cobb County ranks

Position among the 159 counties of Georgia, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn GeorgiaNationally
Population793,3453rd of 15984th of 3,144
Land area339.7 sq mi83rd of 1592,712th of 3,144
Population density2,335 per sq mi3rd of 15960th of 3,144
Median household income$102,7386th of 159148th of 3,143

Full data for Cobb County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population793,345Vintage 2025 Population Estimates
Population in 2020766,385Vintage 2025 Population Estimates
2020 estimates base?766,088Vintage 2025 Population Estimates
Land area339.7 sq mi2025 Gazetteer Files
Water area4.6 sq mi2025 Gazetteer Files
Total area344.3 sq mi2025 Gazetteer Files
Population density?2,335 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$102,738American Community Survey 2020-2024 5-Year Estimates
Median home value$407,200American Community Survey 2020-2024 5-Year Estimates
Median age37.5American Community Survey 2020-2024 5-Year Estimates
Households295,714American Community Survey 2020-2024 5-Year Estimates
Housing units314,104American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
+3,710
8,750 births, 5,040 deaths
Net migration
+705
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering Cobb County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Fulton CountyGeorgia33 mi1,098,791
Paulding CountyGeorgia20 mi190,996
Cherokee CountyGeorgia15 mi299,273
Douglas CountyGeorgia11 mi154,293
Bartow CountyGeorgia4.5 mi120,800

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

Side by side

All 159 counties of Georgia

Open the interactive Georgia county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.