Planners say Mableton’s incorporation reshaped county counts; IGAs to guide annexation and land-use consistency

Donald Wells, the county’s intergovernmental coordinator, told attendees that much of the county remains unincorporated and that understanding jurisdictional distribution is critical for decisions on service delivery and land use. "Nearly 150,000 acres is still unincorporated," he said.

Wells explained that when Mableton became a city a large existing population was reclassified from unincorporated Cobb to incorporated Cobb; that boundary change, he said, accounts for the apparent jump on the county’s population charts and is not a sudden increase in people choosing to move into the county. "The key message here is that the growth patterns reflect a structural jurisdictional change, not a fundamental shift to where people choose to live," Wells said.

To coordinate development, Wells said the county currently holds intergovernmental agreements (IGAs) with six of the seven municipalities and is drafting a land-use IGA with Mableton to ensure consistency in use patterns, especially around annexation and rezoning decisions. He described IGAs as tools to foster communication among cities, county staff and elected officials and to maintain neighborhood character when boundaries change.