Cobb County is a suburban county located in the U.S. state of Georgia. As of the 2010 census, the population was 688,078, making it the fourth-most populous county in Georgia. Its county seat and largest city is Marietta.
Cobb, along with several adjoining counties, was created on December 3, 1832, by the Georgia General Assembly from the huge Cherokee "county" territory—land northwest of the Chattahoochee River which the state confiscated from the Cherokee Nation and redistributed to settlers via lottery, following the passage of the federal Indian Removal Act. The county was named for Thomas Willis Cobb, a United States representative and senator from Georgia. It is believed that Marietta was named for his wife, Mary.
Cobb County is included in the Atlanta-Sandy Springs-Roswell, GA Metropolitan Statistical Area. It is situated immediately to the northwest of the city limits of Atlanta.
Its Cumberland District, an edge city, encompasses over 24,000,000 square feet (2,200,000 m2) of office space.
The U.S. Census Bureau ranks Cobb County as the most-educated in the state of Georgia and 12th among all counties in the United States. It has ranked among the top 100 wealthiest counties in the United States.