Question: What county in the 10-county Atlanta Regional Commission had a population of 259,424 during the 2010 census?
Sentence (from "Atlanta Regional Commission"): It also serves as the metropolitan planning organization for those and ten more counties in the region: Barrow, Bartow, Carroll, Coweta, Forsyth, Hall, Newton, Paulding, Spalding, and Walton counties.
Relevant evidence: No