Northern Illinois Data by Subject Demographic Characteristics - Households by Household Size Select an Area Cook County, Illinois   Boone County   Bureau County   Carroll County   Cook County   DeKalb County   DuPage County   Grundy County   Henry County   JoDaviess County   Kane County   Kankakee County   Kendall County   Lake County   LaSalle County   Lee County   McHenry County   Mercer County   Ogle County   Putnam County   Rock Island County   Stephenson County   Whiteside County   Will County   Winnebago County   Chicago PMSA   Quad Cities MSA   Rockford MSA   State of Illinois Household Size 1980 1990 2000 Change 1980-1990 Change 1990-2000 Number Percent Number Percent Total households 1,879,117 1,879,488 1,974,408 371 -- 94,920 5.1   1 person 502,522 530,253 579,503 27,731 5.5 49,250 9.3   2 persons 532,359 533,746 550,005 1,387 0.3 16,259 3.0   3 - 4 persons 562,918 564,192 563,756 1,274 0.2 -436 -0.1   5 or more persons 281,318 251,297 281,144 -30,021 -10.7 29,847 11.9 Persons per household (Mean) 2.75 2.57 2.68   SOURCE: U.S. Census Bureau, 1980, 1990, 2000. ::: click here to print this page :::