RHEA COUNTY, situated in the easterly part of Tennessee, with Tennessee river on the southeast. Area, 440 square miles.Face of the country hilly and mountainous. Seat of justice, Washington. Pop. in 1810, 2,504; in 1820, 4,215; in 1830, 8,182; in 1840, 3,985; in 1850, 4,415. (Fanning's, 1853)