Atlanta's Hartsfield-Jackson Atlanta International Airport serves the greater metro area, including Marietta. Airlines serving Hartsfield-Jackson include domestic and international carriers, as well as commuter and freight lines. Cobb County is bisected by Interstate 75 and Highway 41/Cobb Parkway. It is bordered on the east by Atlanta's perimeter highway Interstate 285 and the Chattahoochee River, and on the south by Interstate 20. In 2004 the state of Georgia announced that approximately $1.2 billion in transportation renovation monies would be available to Cobb County with a focus on developing high-occupancy vehicle lanes on I-575 and bus lanes on I-285 and I-75.
Cumberland Transportation Network and Cobb Community Transit offer alternative ways to get around and connect Cobb County with Atlanta and the MARTA rapid transit system.