Question: What county in the 10-county Atlanta Regional Commission had a population of 259,424 during the 2010 census?
Sentence (from "Athens, Georgia"): Athens (formally known as Athens-Clarke County) is a consolidated city–county in the U.S. state of Georgia, in the northeastern part of the state about an hour's drive from the global city of Atlanta, and comprising the former city of Athens proper (the county seat) and Clarke County.
Relevant evidence: No