Sister cities of Cobb County, Georgia

Cobb County is a suburban county located in the U.S. state of Georgia. Its county seat and largest city is Marietta, which is located in the center of the county. The county was named for Thomas Willis Cobb, who in the early 19th century was a United States representative and senator from Georgia. It is believed that Marietta was named for his wife, Mary.

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.

As of the 2010 census, the population was 688,078. The county's population has continued to grow. It is a part of the five-county Atlanta metropolitan area. Cobb County is situated immediately outside the northwest city limits of Atlanta, and is connected to the metropolitan area by interstate highways I-285, I-75, I-20 and I-575. In the last three decades of the 20th century, the county was one of the fastest growing areas of the United States. Within the past 50 years, the county has grown from a primarily undeveloped rural area into a metropolitan suburb.

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.