Northern Illinois Data by Subject Demographic Characteristics - Households by Household Size Select an Area Quad Cities, Illinois - Iowa MSA* * The Quad Cities, Illinois - Iowa Metropolitan Statistical Area (MSA) consists of Rock Island and Henry counties in Illinois,and Scott county in Iowa.   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 138,402 136,160 143,077 -2,242 -1.6 6,917 5.1   1 person 31,120 35,889 40,116 4,769 15.3 4,227 11.8   2 persons 43,709 44,784 48,859 1,075 2.5 4,075 9.1   3 - 4 persons 45,823 42,594 41,464 -3,229 -7.0 -1,130 -2.7   5 or more persons 17,750 12,893 12,671 -4,857 -27.4 -222 -1.7 Persons per household (Mean) 2.76 2.55 2.46   SOURCE: U.S. Census Bureau, 1980, 1990, 2000. ::: click here to print this page :::