Rock Island County IL Information


Rock Island County Subdivisions

Rock Island County IL Data & Demographics (As of July 1, 2016)


Total Population 147,799
Population in Households 143,486
Population in Familes 111,577
Population in Group Qrtrs 4,313
Population Density1 346
Diversity Index2 51


Total Households 61,706
Average Household Size 2.33
Family Households 38,199
Average Family Size 3


Total Housing Units 66,872 (100%)
Owner Occupied HU 41,289 (61.7%)
Renter Occupied HU 20,417 (30.5%)
Vacant Housing Units 5,166 ( 7.7%)
Median Home Value $109,879
Average Home Value $140,894


Median Household Income $46,445
Average Household Income $62,739
Per Capita Income $26,847
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 0.03% -0.01%
Households 0.1% 0.04%
Families -0.08% -0.08%
Median Household Income   -1.09%
Per Capita Income   1.18%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.


Rock Island County IL - Peer Comparisons by Rank and Percentile

The table below compares Rock Island County to the other 102 counties and county equivalents in Illinois by rank and percentile using July 1, 2016 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 14 87th
Population Density1 # 11 90th
Diversity Index2 # 14 87th
Median Household Income # 54 48th
Per Capita Income # 32 70th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.