Fanning's Illustrated Gazetteer of the United States.... (New York: Phelps, Fanning & Co., 1853), 374.
WARREN COUNTY, situated on the westerlv boundary of New Jersey, with Delaware river on the west. Area, 350 square miles. Face of the country, uneven and mountainous ; soil, productive. Seat of justice, Belvidere. Pop. in 1830, 18,627; in 1840, 20,366; in 1850, 22,358.