Cobb County, Georgia
Cobb County, Georgia, has 793,345 residents (July 2025 estimate). Its county seat is Marietta. It uses Eastern Time and covers 340 sq mi (880 km²) of land.
- Resident population, July 2025
- 793,345
- Land area
- 340 sq mi (880 km²)
- County seat or government
- Marietta
- Time zone
- Eastern TimeUTC-05:00 in January; UTC-04:00 in July
- Median household income
- $102,738 ± $1,561
- Median home value
- $407,200 ± $4,795
- Median rent, with utilities
- $1,730 ± $15
- Homes lived in by their owners
- 67% ± 0.7 points
- County type
- County
- Metro or micro area
- Atlanta-Sandy Springs-Roswell, GA metro areaCentral county
- Water area
- 4.64 sq mi (12 km²)
- State
- Georgia
- County code (FIPS)
- 13067
- Coordinates (central point)
- 33.939926, -84.574110
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Cobb County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Eastern TimeAmerica/New_York | UTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 3012771,626 people
- 3018869,518 people
- 3010162,593 people
- 3006262,284 people
- 3006661,761 people
- 3014459,661 people
- 3007556,263 people
- 3015753,445 people
- 3008053,316 people
- 3006452,125 people
- 3006747,271 people
- 3010245,319 people
All 26
26 ZIP Code areas overlap Cobb County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
Cobb County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
School districts in Cobb County, largest first
- Cobb County School District712,945 people
- Marietta City School District62,263 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Roswell, Georgia (city)92,621 people
- Mableton, Georgia (city)77,678 people
- Marietta, Georgia (city)62,263 people
- Smyrna, Georgia (city)56,633 people
- Kennesaw, Georgia (city)34,605 people
- Acworth, Georgia (city)22,473 people
- Powder Springs, Georgia (city)18,009 people
- Vinings, Georgia (CDP)14,390 people
- Fair Oaks, Georgia (CDP)9,014 people
- Austell, Georgia (city)8,447 people
- Kennesaw State University, Georgia (CDP)2,284 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Fulton County, Georgia12 mi southeast
- Paulding County, Georgia17 mi west
- Douglas County, Georgia20 mi southwest
- Cherokee County, Georgia22 mi north
- Bartow County, Georgia26 mi northwest
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county where you are now, check its ZIP area, or check the time zone where you are.
Areas that only touch the edge
These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.