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Illinois County Boundaries Maps from 1790-1869
Illinois County Boundaries from 1790-1869
- from Maps of US (click on the year you want to see the county boundaries for)
Illinois County Boundaries Maps From 1790-1859 - all one one page
Individual County Chronologies
- Illinois Atlas of Historical County Boundaries (at Newberry Library website)
Origin and Evolution of Illinois Counties
from Secretary of State, Alexi Giannoulias (in PDF file)
