1839 Illinois County Formation Map
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1839--TWENTY-ONE NEW COUNTIES
1837-1839--TWENTY-ONE NEW COUNTIES
1837
- Livingston...Established Feb. 27...Laws 1837, page... 83
- Bureau.......Established Feb. 28...Laws 1837, page... 93
- Cass.........Established Mar. 3...Laws 1837, page...101
- Boone........Established Mar. 4...Laws 1837, page... 96
- DeKalb.......Established Mar. 4...Laws 1837, page... 97
- Stephenson...Established Mar. 4...Laws 1837, page... 96
- Winnebago, boundary re-defined...Mar. 4...Laws 1837, page... 96
- McHenry, eastern boundary defined...Mar. 4...Laws 1837, page... 89
- Henry, territory detached...Mar. 4...Laws 1837, page... 89
- Adams, Hancock, Warren and Mercer, western boundary defined, Mar. 4, Laws 1837, page... 91
1839
- Marshall...Established Jan. 19...Laws 1839, page... 43
- Brown......Established Feb. 1...Laws 1839, page... 52
- DuPage.....Established Feb. 9...Laws 1839, page... 73
- Dane (now Christian)...Established Feb. 15...Laws 1839, page...104
- Logan......Established Feb. 15...Laws 1839, page...104
- Menard... Established Feb. 15...Laws 1839, page...104
- Scott......Established Feb. 16...Laws 1839, page...126
- Carroll....Established Feb. 22...Laws 1839, page...160
- Lee........Established Feb. 27...Laws 1839, page...170
- Jersey.....Established Feb. 28...Laws 1839, page...208
- Warren.....Established Feb. 28...Laws 1839, page...110
- DeWitt.....Established Mar. 1...Laws 1839, page...199
- Lake.......Established Mar. 1...Laws 1839, page...216
- Hardin.....Established Mar. 2...Laws 1839, page...234
- Stark......Established Mar. 2...Laws 1839, page...229
- Ogle, territory added....Feb. 22...Laws 1839, page...162
- Dane, territory added....Feb. 26...Laws 1839, page...188
- Macon, territory added...Mar. 2...Laws 1839, page...265
- Hardin-Pope, line defined.....Jan. 8, 1840..Laws 1840, page... 38
- Logan, territory added...Jan. 29, 1840..Laws 1840, page... 39
- Dane, name changed to Christian....Feb. 1, 1840..Laws 1840, page... 80