Skip to content U.S. Department of Transportation/Federal Highway AdministrationU.S. Department of Transportation/Federal Highway Administration

Office of Planning, Environment, & Realty (HEP)
PlanningEnvironmentReal Estate

HEP Events Guidance Publications Awards Contacts

Nonattainment & Maintenance Area Populations by State and County FY 2009

Illinois

STATECOUNTY2007.7.01
POP.
1-Hr O3
Class
O3
WT
CO
Class
CO
WT
8-hr
Class
8-hr
WT
POPULATION
FINAL WTED
ILLINOIS  9,426,186        10,056,796
Chicago-Gary-Lake County        
 Cook 5,285,107Sev   md1.1 5,813,618
 DuPage 929,192Sev   md1.1 1,022,111
 Grundy 47,144Sev   md1.1 51,858
 Kane 501,021Sev   md1.1 551,123
 Kendall 96,818Sev   md1.1 106,500
 Lake 710,241Sev   md1.1 781,265
 McHenry 315,943Sev   md1.1 347,537
 Will 673,586Sev   md1.1 740,945
 Dekalb 103,729       
 Kankakee 110,705       
St. Louis, MO-IL        
 Madison 267,347Mnt   md1.1 294,082
 Monroe 32,372Mnt   md1.1 35,609
 St. Clair 261,316Mnt   md1.1 287,448
 Clinton 36,450       
 Randolph 32,760       0
Jersey Co.         
St. Louis, MO-ILJersey Co 22,455Mnt   md1.1 24,701
AKALARAZCACOCTDCDEFLGAHIIAIDILINKSKYLAMAMDMEMIMNMOMSMTNC
NDNENHNJNMNVNYOHOKORPAPRRISCSDTNTXUTVAVTWAWIWVWY
Updated: 07/06/2011
HEP Home Planning Environment Real Estate
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000