Cities in Illinois by average household size

Cicero, IL had the highest average household size of 224 cities in 2021, at 3.5 persons per household. Carbondale, IL had the lowest, at 1.9 persons per household. The median was 2.6 persons per household and the figure for Illinois was 2.5 persons per household. Source: the U.S. Census Bureau.

Highest3.5Cicero, IL

Lowest1.9Carbondale, IL

Median2.6224 cities

Illinois2.5History

Top 40 cities, 2021

persons per household. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more). Retrieved 2026-10-12.

Full ranking

Rank	Cities	2021 persons per household
1	Cicero, IL	3.5
2	West Chicago, IL	3.4
3	Hanover Park, IL	3.4
4	Carpentersville, IL	3.3
5	Plainfield, IL	3.3
6	Round Lake Beach, IL	3.3
7	Markham, IL	3.3
8	Romeoville, IL	3.2
8	Summit, IL	3.2
10	Melrose Park, IL	3.2
11	Channahon, IL	3.2
12	Montgomery, IL	3.1
13	Bolingbrook, IL	3.1
13	Minooka, IL	3.1
15	Frankfort, IL	3.1
15	Franklin Park, IL	3.1
17	Bellwood, IL	3.1
18	Burbank, IL	3.1
18	Streamwood, IL	3.1
20	Round Lake, IL	3.1
21	Homer Glen, IL	3
21	Manhattan, IL	3
23	Beach Park, IL	3
23	Western Springs, IL	3
25	Campton Hills, IL	3
26	Aurora, IL	3
26	Joliet, IL	3
26	Maywood, IL	3
26	New Lenox, IL	3
26	Pingree Grove, IL	3
31	Hinsdale, IL	3
31	Mahomet, IL	3
33	Bartlett, IL	2.9
33	Elgin, IL	2.9
35	Glendale Heights, IL	2.9
35	Lake in the Hills, IL	2.9
35	South Elgin, IL	2.9
38	Lindenhurst, IL	2.9
38	Oswego, IL	2.9
40	Berwyn, IL	2.9
40	Chicago Heights, IL	2.9
40	Plano, IL	2.9
40	Winnetka, IL	2.9
44	Country Club Hills, IL	2.9
44	Hazel Crest, IL	2.9
46	Waukegan, IL	2.9
46	Yorkville, IL	2.9
48	Roscoe, IL	2.9
48	South Holland, IL	2.9
48	Zion, IL	2.9
51	Cary, IL	2.8
52	Lemont, IL	2.8
52	Lockport, IL	2.8
54	Addison, IL	2.8
54	Hickory Hills, IL	2.8
54	Hoffman Estates, IL	2.8
54	Shorewood, IL	2.8
58	Mundelein, IL	2.8
58	River Grove, IL	2.8
60	Lincolnwood, IL	2.8
60	Mokena, IL	2.8
60	Northlake, IL	2.8
63	Carol Stream, IL	2.8
63	Harvey, IL	2.8
65	Skokie, IL	2.8
66	Crystal Lake, IL	2.8
66	La Grange, IL	2.8
66	Lake Zurich, IL	2.8
66	Wauconda, IL	2.8
70	Bridgeview, IL	2.8
70	Naperville, IL	2.8
70	Riverdale, IL	2.8
73	Dolton, IL	2.7
73	Justice, IL	2.7
73	Villa Park, IL	2.7
73	Wood Dale, IL	2.7
77	Blue Island, IL	2.7
77	O'Fallon, IL	2.7
77	Schiller Park, IL	2.7
80	Algonquin, IL	2.7
80	Belvidere, IL	2.7
80	Chatham, IL	2.7
80	Lyons, IL	2.7
84	Libertyville, IL	2.7
85	Antioch, IL	2.7
85	Bensenville, IL	2.7
85	Buffalo Grove, IL	2.7
85	Elmhurst, IL	2.7
85	Wilmette, IL	2.7
90	Geneva, IL	2.7
91	Homewood, IL	2.7
91	Oak Forest, IL	2.7
93	Batavia, IL	2.7
94	Grayslake, IL	2.7
94	Gurnee, IL	2.7
94	Washington, IL	2.7
97	Bourbonnais, IL	2.6
97	Des Plaines, IL	2.6
97	Elmwood Park, IL	2.6
97	Machesney Park, IL	2.6
101	Barrington, IL	2.6
101	Evergreen Park, IL	2.6
101	Morton Grove, IL	2.6
101	Rolling Meadows, IL	2.6
105	Vernon Hills, IL	2.6
106	Bradley, IL	2.6
106	Lake Forest, IL	2.6
106	North Chicago, IL	2.6
106	Oak Lawn, IL	2.6
106	Roselle, IL	2.6
106	Swansea, IL	2.6
106	Warrenville, IL	2.6
113	Columbia, IL	2.6
113	Mount Prospect, IL	2.6
113	Woodridge, IL	2.6
116	Calumet City, IL	2.6
116	Glen Ellyn, IL	2.6
116	Lansing, IL	2.6
119	Chicago Ridge, IL	2.6
119	Elk Grove Village, IL	2.6
119	Glenview, IL	2.6
119	Park Forest, IL	2.6
123	Edwardsville, IL	2.6
123	Northbrook, IL	2.6
123	Park Ridge, IL	2.6
123	Wheaton, IL	2.6
127	Deerfield, IL	2.6
127	La Grange Park, IL	2.6
127	Matteson, IL	2.6
127	Palos Heights, IL	2.6
131	Brookfield, IL	2.6
131	Niles, IL	2.6
131	North Aurora, IL	2.6
131	Richton Park, IL	2.6
135	Lombard, IL	2.5
135	Palatine, IL	2.5
135	Winfield, IL	2.5
138	East St. Louis, IL	2.5
138	Midlothian, IL	2.5
138	Norridge, IL	2.5
138	Orland Park, IL	2.5
138	Tinley Park, IL	2.5
143	Darien, IL	2.5
143	Prospect Heights, IL	2.5
143	Wheeling, IL	2.5
143	Woodstock, IL	2.5
147	Troy, IL	2.5
148	Worth, IL	2.5
149	Alsip, IL	2.5
149	Kankakee, IL	2.5
149	St. Charles, IL	2.5
152	Highland Park, IL	2.5
153	Waterloo, IL	2.5
154	Burr Ridge, IL	2.5
155	McHenry, IL	2.5
155	Shiloh, IL	2.5
155	Sycamore, IL	2.5
158	Arlington Heights, IL	2.4
158	Downers Grove, IL	2.4
158	Rantoul, IL	2.4
158	Westchester, IL	2.4
162	Bloomingdale, IL	2.4
162	Glen Carbon, IL	2.4
162	Kewanee, IL	2.4
165	Chicago, IL	2.4
166	Granite City, IL	2.4
166	River Forest, IL	2.4
166	Schaumburg, IL	2.4
169	Danville, IL	2.4
169	East Moline, IL	2.4
169	Ottawa, IL	2.4
172	Normal, IL	2.4
173	Rockford, IL	2.4
174	Wood River, IL	2.4
175	DeKalb, IL	2.4
175	Evanston, IL	2.4
175	Fairview Heights, IL	2.4
175	Loves Park, IL	2.4
175	Oak Park, IL	2.4
175	Palos Hills, IL	2.4
181	Belleville, IL	2.3
181	Huntley, IL	2.3
181	Moline, IL	2.3
184	Morris, IL	2.3
184	Westmont, IL	2.3
186	Morton, IL	2.3
187	East Peoria, IL	2.3
188	Bloomington, IL	2.3
188	Collinsville, IL	2.3
188	Mount Vernon, IL	2.3
188	Peoria, IL	2.3
192	Alton, IL	2.3
192	Centralia, IL	2.3
192	Godfrey, IL	2.3
192	Herrin, IL	2.3
192	Lisle, IL	2.3
197	Champaign, IL	2.3
198	Effingham, IL	2.3
198	Quincy, IL	2.3
200	Rock Island, IL	2.3
201	Crest Hill, IL	2.3
202	Pekin, IL	2.2
202	Sterling, IL	2.2
204	Taylorville, IL	2.2
205	Decatur, IL	2.2
205	Fox Lake, IL	2.2
205	Highland, IL	2.2
208	Dixon, IL	2.2
208	Jacksonville, IL	2.2
208	Pontiac, IL	2.2
211	Crestwood, IL	2.2
211	Springfield, IL	2.2
213	Freeport, IL	2.2
214	Canton, IL	2.1
215	Macomb, IL	2.1
216	Galesburg, IL	2.1
216	Lincoln, IL	2.1
216	Streator, IL	2.1
219	Marion, IL	2.1
220	Mattoon, IL	2.1
221	Charleston, IL	2.1
222	Urbana, IL	2
223	Forest Park, IL	2
224	Carbondale, IL	1.9

Other periods

2024
2023
2022
2021

About this ranking

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.

Covers private households only; people living in institutions or other group quarters are excluded. EU-SILC figures refer to the survey year. The EU and US surveys differ, so their figures are not strictly comparable.

Every value in the ranking comes from the same publisher and the same period, so the cities are compared on one definition. 1 cities with data in other periods have no value for 2021 and are left out rather than filled from another source. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more). https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more) (Cities in Illinois by average household size, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat

MLA 9

American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more), Cities in Illinois by average household size, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. Invokely, https://invokely.ai/rankings/average-household-size/illinois-cities?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more). Cities in Illinois by average household size, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. Also distributed by Invokely, https://invokely.ai/rankings/average-household-size/illinois-cities?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more), Cities in Illinois by average household size, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat, via Invokely: https://invokely.ai/rankings/average-household-size/illinois-cities?period=2021 (Accessed: 12 October 2026).

BibTeX

@misc{census_cities_in_illinois_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more): Cities in Illinois by average household size, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/average-household-size/illinois-cities?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more). https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. Retrieved 2026-10-12.},
}

RIS

TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more): Cities in Illinois by average household size, 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat
L2  - https://invokely.ai/rankings/average-household-size/illinois-cities?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-household-size/illinois-cities?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more). https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. Retrieved 2026-10-12.
ER  -

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Questions

Which city has the highest average household size?

Cicero, IL, with 3.5 persons per household in 2021, according to the U.S. Census Bureau.

Which city has the lowest average household size?

Carbondale, IL, with 1.9 persons per household in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, US cities (incorporated places of 10,000 or more). Retrieved 2026-10-12. 1 cities have no value for 2021 and are not ranked.