IOWA MO. EAST CHICAGO UNIVERSITY CITY STANDARD METROPOLITAN AREAS CODE 028 CHICAGO 036 DAVENPORT, IOWA-ROCK ISLAND-MOLINE, ILL. 038 DECATUR 109 PEORIA 124 ROCKFORD 128 ST. LOUIS, MO. 144 SPRINGFIELD NOTE INCLUDES CITIES FOR WHICH A SPECIAL CENSUS OF POPULATION WAS TAKEN SINCE 1950 (TO SEPT. 15. 1954); SEE APPENDIX ON SPECIAL CENSUSES. 528 STANDARD METROPOLITAN AREAS |