# Counties in Illinois by average household size, 2024

All 102 values come from U.S. Census Bureau for 2024, so the places are comparable.

- Indicator id: `average_household_size`
- Unit: persons per household
- Definition: Average number of persons per private household. EU countries: EU-SILC. United States: American Community Survey five-year estimate of people in households divided by occupied housing units, where the period shown is the last year of the five-year span.
- Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25010: average household size of occupied housing units (https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat)
- Publisher page: https://invokely.ai/en/publishers/us-census-bureau
- Retrieved: 2026-10-12
- Citation: U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/average-household-size/illinois-counties

| Rank | Place | persons per household |
|---:|---|---:|
| 1 | Calhoun County | 3.4 |
| 2 | Kendall County | 3 |
| 3 | Will County | 2.8 |
| 4 | Johnson County | 2.8 |
| 5 | Kane County | 2.8 |
| 6 | Boone County | 2.7 |
| 7 | Lake County | 2.7 |
| 8 | McHenry County | 2.6 |
| 9 | DuPage County | 2.6 |
| 10 | Fayette County | 2.6 |
| 11 | Pope County | 2.6 |
| 12 | Greene County | 2.6 |
| 13 | Grundy County | 2.6 |
| 14 | Jersey County | 2.5 |
| 14 | Woodford County | 2.5 |
| 16 | Douglas County | 2.5 |
| 16 | Monroe County | 2.5 |
| 18 | Alexander County | 2.5 |
| 19 | Massac County | 2.5 |
| 19 | Pulaski County | 2.5 |
| 21 | Kankakee County | 2.5 |
| 21 | Lawrence County | 2.5 |
| 23 | Macoupin County | 2.5 |
| 23 | St. Clair County | 2.5 |
| 25 | Cass County | 2.5 |
| 26 | Ogle County | 2.5 |
| 27 | Cumberland County | 2.4 |
| 27 | Effingham County | 2.4 |
| 29 | Cook County | 2.4 |
| 30 | DeKalb County | 2.4 |
| 30 | Jasper County | 2.4 |
| 30 | Moultrie County | 2.4 |
| 33 | Winnebago County | 2.4 |
| 34 | Clay County | 2.4 |
| 34 | Clinton County | 2.4 |
| 34 | Piatt County | 2.4 |
| 34 | Scott County | 2.4 |
| 38 | Bond County | 2.4 |
| 39 | Jefferson County | 2.4 |
| 39 | Pike County | 2.4 |
| 39 | Richland County | 2.4 |
| 42 | Henry County | 2.4 |
| 43 | Madison County | 2.4 |
| 43 | Tazewell County | 2.4 |
| 43 | Union County | 2.4 |
| 46 | Christian County | 2.3 |
| 46 | Lee County | 2.3 |
| 46 | Morgan County | 2.3 |
| 46 | White County | 2.3 |
| 50 | LaSalle County | 2.3 |
| 50 | Marion County | 2.3 |
| 50 | Mercer County | 2.3 |
| 50 | Whiteside County | 2.3 |
| 54 | Bureau County | 2.3 |
| 54 | McLean County | 2.3 |
| 54 | Vermilion County | 2.3 |
| 54 | Washington County | 2.3 |
| 54 | Wayne County | 2.3 |
| 59 | Crawford County | 2.3 |
| 59 | De Witt County | 2.3 |
| 59 | Hamilton County | 2.3 |
| 59 | Perry County | 2.3 |
| 59 | Shelby County | 2.3 |
| 59 | Wabash County | 2.3 |
| 65 | Clark County | 2.3 |
| 65 | Livingston County | 2.3 |
| 65 | Menard County | 2.3 |
| 68 | Franklin County | 2.3 |
| 68 | Gallatin County | 2.3 |
| 70 | Champaign County | 2.3 |
| 70 | Edwards County | 2.3 |
| 70 | Henderson County | 2.3 |
| 70 | Iroquois County | 2.3 |
| 70 | Macon County | 2.3 |
| 70 | Montgomery County | 2.3 |
| 70 | Putnam County | 2.3 |
| 70 | Stark County | 2.3 |
| 70 | Warren County | 2.3 |
| 79 | Saline County | 2.3 |
| 80 | Adams County | 2.3 |
| 80 | Hardin County | 2.3 |
| 80 | Randolph County | 2.3 |
| 80 | Sangamon County | 2.3 |
| 84 | Fulton County | 2.2 |
| 84 | Peoria County | 2.2 |
| 86 | Ford County | 2.2 |
| 86 | Hancock County | 2.2 |
| 86 | Marshall County | 2.2 |
| 86 | Rock Island County | 2.2 |
| 86 | Williamson County | 2.2 |
| 91 | Stephenson County | 2.2 |
| 92 | Mason County | 2.2 |
| 93 | Logan County | 2.2 |
| 93 | Schuyler County | 2.2 |
| 95 | Brown County | 2.2 |
| 95 | Knox County | 2.2 |
| 97 | Edgar County | 2.1 |
| 97 | Jackson County | 2.1 |
| 99 | Carroll County | 2.1 |
| 100 | Jo Daviess County | 2.1 |
| 101 | Coles County | 2.1 |
| 102 | McDonough County | 2.1 |