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Your Ad Here Cobb County, Georgia Cobb County is a county located in the U.S. state of Georgia. The 2006 estimate from the U.S. Census Bureau put the population at 679,325. Its county seat is Marietta. History It was created December 3, 1832. The county was named for Judge Thomas Willis Cobb, who in the early 19th century was a United States Representative and Senator from Georgia. He also served as a judge of the Superior Court of Georgia. ![]() |