Rock Island County IL Information


Rock Island County Subdivisions

Rock Island County IL Data & Demographics (As of July 1, 2017)


Total Population 146,760
Daytime Population: Workers 83,778
Daytime Population: Residents 75,354
Total Daytime Population (TDP) 159,132
Ratio TDP/Total Population1 1.08
Population in Households 142,129
Population in Familes 110,481
Population in Group Qrtrs 4,631
Population Density2 343
Diversity Index3 52


Median Household Income $48,019
Average Household Income $66,215
Per Capita Income $28,295


Total Housing Units 66,660 (100%)
Owner Occupied HU 40,695 (61.0%)
Renter Occupied HU 20,452 (30.7%)
Vacant Housing Units 5,513 ( 8.3%)
Median Home Value $111,122
Average Home Value $143,744


Total Households 61,147
Average Household Size 2.32
Family Households 37,767
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood 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.


2010-2017 2017-2022
Population -0.07% -0.21%
Households -0.04% -0.17%
Families -0.22% -0.3%
Median Household Income   0.74%
Per Capita Income   2.35%


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, 2017 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 Density # 11 90th
Diversity Index # 13 88th
Median Household Income # 57 45th
Per Capita Income # 29 73rd

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