Rock Island County IL Information


Rock Island County Subdivisions

Jump to... (On This Page!)
  1. Rock Island County 2018 Demographic Data
  2. Growth Rates forRock Island County (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Illinois Research Tools (Easy Tools & Current Data)
  3. Illinois Data Comparison Tool - 2018 Demographics

Rock Island County IL Data & Demographics (As of July 1, 2018)


Total Population 145,472
Population in Households 140,829
Population in Familes 109,903
Population in Group Qrtrs 4,643
Population Density2 340
Diversity Index3 52


Median Household Income $49,297
Average Household Income $68,542
Per Capita Income $29,343


Total Housing Units 65,756 (100%)
Owner Occupied HU 40,547 (61.7%)
Renter Occupied HU 20,213 (30.7%)
Vacant Housing Units 4,996 ( 7.6%)
Median Home Value $120,474
Average Home Value $152,642


Total Households 60,760
Average Household Size 2.32
Family Households 37,437
Average Family Size 3
  1. Demographics are point estimates for July 1st of the current year and each for the forecast years. See References for more information.
  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.


2010-2018 2018-2023
Population -0.17% -0.41%
Households -0.11% -0.36%
Families -0.3% -0.49%
Median Household Income   1.22%
Per Capita Income   2.44%


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, 2018 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 # 12 88th
Median Household Income # 61 41st
Per Capita Income # 30 72nd

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

Quick & Easy Ways to...

  1. Get Current Demographic Data for Cities, Towns, and ZIP Codes
  2. View Boundary Maps, for Cities, Towns, and ZIP Codes
  3. Locate Physical, Cultural, and Historical Features
  4. Research Public Schools & Attendance Zones

Illinois Census Data Comparison Tool

Compare Illinois July 1, 2018 Data
Highest or Lowest: