Henry County is located in the north central portion of the U.S. state of Georgia. According to the 2020 census, the population of Henry County was 240,712, up from 203,922 in 2010. The seat of government is McDonough. The county was named for Patrick Henry. Henry County is part of the Atlanta-Sandy Springs-Roswell, GA metropolitan statistical area. The Henry County Courthouse is listed on the National Register of Historic Places.