The Northwestern Land District Office was created at Galena by Congressional act of Juen 26, 1834. District was composed of land which formerly had been part of Quincy District lying north of the line separating townships twelve and thirteen north of baseline for fourth principal meridian, as well as small part of Danville District. On November 2, 1840, district office was moved from Galena to Dixon. Northwestern District Office was abolished on September 3, 1855, and responsibility for selling all remaining public land in district was transferred to Springfield District Office.
From the description of Tract books of land sold within Northwestern District, ca. June 1835-September 1870. (Illinois State Archive). WorldCat record id: 38071696
