Henry Howe, Historical Collections of Virginia… (Charleston, SC: William R. Babcock, 1852), 496-497.
WARREN was formed in 1836, from Frederick and Shenandoah: it is 20 miles long and 12 wide. The Shenandoah River runs through it at the base of the Blue Ridge, and receives in its passage the waters of its North Fork, which enters it from the west. There is considerable mountain land in the SW. part of the country, and the surface is generally hilly, yet there is much excellent soil. Pop. in 1840, whites 3,851, slaves 1,434, free colored 342; total, 5,627.