Mercer County IL Information


Mercer County Subdivisions

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


Total Population 16,254
Daytime Population: Workers 4,095
Daytime Population: Residents 8,002
Total Daytime Population (TDP) 12,097
Ratio TDP/Total Population1 0.74
Population in Households 16,069
Population in Familes 13,385
Population in Group Qrtrs 185
Population Density2 29
Diversity Index3 10


Median Household Income $50,718
Average Household Income $66,059
Per Capita Income $27,478


Total Housing Units 7,551 (100%)
Owner Occupied HU 5,247 (69.5%)
Renter Occupied HU 1,423 (18.8%)
Vacant Housing Units 881 (11.7%)
Median Home Value $94,114
Average Home Value $125,781


Total Households 6,670
Average Household Size 2.41
Family Households 4,629
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 -0.15% -0.48%
Households -0.13% -0.47%
Families -0.28% -0.56%
Median Household Income   1.23%
Per Capita Income   2.75%


Mercer County IL - Peer Comparisons by Rank and Percentile

The table below compares Mercer 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 # 69 33rd
Population Density # 80 23rd
Diversity Index # 76 26th
Median Household Income # 40 62nd
Per Capita Income # 35 67th

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