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DATE OF INCORPORATION NAME OF LOCAL FORM OF DATE COUNTY LAWS IN FORCE GOVERNMENT GOVERNMENT COUNTY ESTABLISHED SEAT BEFORE JULY 1 1872-AFTER JULY 1 1872 CERTIFIED FORMERLY
ALORTON M-VILLAGE ST. CLAIR NO SEPT. 26, 1944 DEC. 4, 1944 ALCOA BELLEVILLE M-CITY ST. CLAIR YES MAR. 27, 1819 MAY 11, 1876 FEB. 15, 1877 BELLEVILLE TOWNSHIP ST. CLAIR NOV. 6, 1883 BROOKLYN M-VILLAGE ST. CLAIR NO AUG. 2, 1873 SEPT. 28, 1901 CAHOKIA M-VILLAGE ST. CLAIR NO MAR. 28, 1927 AUG. 1, 1927 CANTEEN TOWNSHIP ST. CLAIR MAR. 5, 1910 CASEYVILLE M-VILLAGE ST. CLAIR NO APR. 15, 1869 APR. 22, 1875 MAY 7, 1875 CASEYVILLE TOWNSHIP ST. CLAIR NOV. 6, 1883 CENTREVILLE M-CITY ST. CLAIR NO OCT. 9, 1957 DEC. 30, 1957 CENTREVILLE TOWNSHIP ST. CLAIR MAR. 5, 1910 COLLINSVILLE M-CITY ST. CLAIR & MADISON NO FEB. 15, 1855 OCT. 1, 1872 NOV. 30, 1872 DUPO M-VILLAGE ST. CLAIR NO AUG. 5, 1907 JULY 8, 1912 EAST CARONDELET M-VILLAGE ST. CLAIR NO AUG. 21, 1876 AUG. 8, 1894 EAST ST. LOUIS M-CITY ST. CLAIR NO FEB. 16, 1865 JAN. 22, 1878 APR. 18, 1878 ILLINOISTOWN EAST ST. LOUIS TOWNSHIP ST. CLAIR NOV. 6, 1883 ENGELMANN TOWNSHIP ST. CLAIR NOV. 6, 1883 FAIRMONT CITY M-VILLAGE ST. CLAIR NO MAR. 3, 1914 SEPT. 27, 1923 FAIRVIEW HEIGHTS M-CITY ST. CLAIR NO OCT. 2, 1969 JAN. 26, 1970 FAYETTEVILLE M-VILLAGE ST. CLAIR NO APR. 15, 1869 DEC. 17, 1881 APR. 4, 1960 FAYETTEVILLE TOWNSHIP ST. CLAIR NOV. 6, 1883 FREEBURG M-VILLAGE ST. CLAIR NO FEB. 21, 1859 MAR. 8, 1875 APR. 26, 1875 URBANA FREEBURG TOWNSHIP ST. CLAIR NOV. 6, 1883 LEBANON M-CITY ST. CLAIR NO FEB. 16, 1857 APR. 13, 1874 JULY 28, 1874 LEBANON TOWNSHIP ST. CLAIR NOV. 6, 1883 LENZBURG M-VILLAGE ST. CLAIR NO JAN. 5, 1884 MAY 2, 1884 LENZBURG TOWNSHIP ST. CLAIR NOV. 6, 1883 MARISSA M-VILLAGE ST. CLAIR NO MAY 26, 1882 FEB. 15, 1883 OLD MARISSA ANNEXED TO MARISSA TOWNSHIP ST. CLAIR NOV. 6, 1883 MASCOUTAH M-CITY ST. CLAIR NO FEB. 16, 1839 APR. 2, 1883 JUNE 11, 1883 MECHANICSBURG MASCOUTAH TOWNSHIP ST. CLAIR NOV. 6, 1883 MILLSTADT M-VILLAGE ST. CLAIR NO JAN. 16, 1878 JULY 19, 1894 CENTERVILLE MILLSTADT TOWNSHIP ST. CLAIR NOV. 6, 1883 NATIONAL CITY M-VILLAGE ST. CLAIR NO JULY 19, 1907 SEPT. 5, 1907 NEW ATHENS M-VILLAGE ST. CLAIR NO MAR. 29, 1869 APR. 25, 1881 MAY 21, 1881 ATHENS NEW ATHENS TOWNSHIP ST. CLAIR NOV. 6, 1883 NEW BADEN M-VILLAGE ST. CLAIR & CLINTON NO FEB. 28, 1867 MAY 21, 1884 MAY 2, 1904 BADEN O'FALLON M-CITY ST. CLAIR NO FEB. 15, 1865 MAR. 27, 1874 MAR. 24, 1905 O'FALLON TOWNSHIP ST. CLAIR NOV. 6, 1883 PRAIRIE DU LONG TOWNSHIP ST. CLAIR NOV. 6, 1883 SAUGET M-VILLAGE ST. CLAIR NO AUG. 14, 1926 OCT. 26, 1926 MONSANTO SHILOH M-VILLAGE ST. CLAIR NO JULY 18, 1905 OCT. 13, 1905 SHILOH TOWNSHIP ST. CLAIR NOV. 6, 1883 SHILOH VALLEY (DATE CHANGED UNKNOWN) SMITHTON M-VILLAGE ST. CLAIR NO JAN. 23, 1878 JULY 6, 1894 SMITHTON TOWNSHIP ST. CLAIR NOV. 6, 1883 ST. CLAIR COUNTY ST. CLAIR APR. 27, 1790 BELLEVILLE ST. CLAIR TOWNSHIP ST. CLAIR OCT. 5, 1885 ST. LIBORY M-VILLAGE ST. CLAIR NO MAR. 19, 1895 SEPT. 24, 1901 STITES TOWNSHIP ST. CLAIR FEB. 1888 BROOKLYN (CHANGED APR. 1888) STOOKEY TOWNSHIP ST. CLAIR NOV. 6, 1883 SUGARLOAF TOWNSHIP ST. CLAIR NOV. 6, 1883 SUMMERFIELD M-VILLAGE ST. CLAIR NO MAR. 29, 1869 JULY 20, 1872 OCT. 18, 1872 SWANSEA M-VILLAGE ST. CLAIR NO APR. 8, 1895 OCT. 21, 1901 WASHINGTON PARK M-VILLAGE ST. CLAIR NO NOV. 27, 1917 DEC. 19, 1923
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