Oldest Cities in Illinois by Median Age

The top 25 of 70 Illinois cities on GIS Map, ranked by highest median age.

#	City	County	Median age	Population
1	Glenview	Cook	46.5 years	47,752
2	Orland Park	Cook	46.3 years	57,916
3	Park Ridge	Cook	44.4 years	38,667
4	East St. Louis	St. Clair	44.3 years	17,999
5	Downers Grove	DuPage	43.6 years	50,054
6	Skokie	Cook	43.2 years	66,219
7	Tinley Park	Cook	43.2 years	54,842
8	Freeport	Stephenson	42.8 years	23,505
9	Arlington Heights	Cook	42.6 years	76,005
10	Sterling	Whiteside	42.6 years	14,717
11	Des Plaines	Cook	42.3 years	59,156
12	Marion	Williamson	42.2 years	16,836
13	Buffalo Grove	Lake/Cook	42 years	42,891
14	Elmhurst	DuPage	42 years	45,671
15	Mount Prospect	Cook	41.1 years	55,472
16	Bartlett	DuPage/Cook	41 years	40,501
17	Springfield	Sangamon	41 years	113,330
18	Addison	DuPage	40.8 years	35,489
19	Galesburg	Knox	40.8 years	29,481
20	Mattoon	Coles	40.8 years	16,586
21	Palatine	Cook	40.7 years	66,293
22	Carol Stream	DuPage	40.4 years	39,460
23	Granite City	Madison	40.4 years	26,549
24	Naperville	DuPage	40.4 years	150,692
25	Oak Lawn	Cook	40.3 years	56,861

Top Illinois Counties

Counties ranked by highest median age.

1. Pope County53.9 years 2. Hardin County53.6 years 3. Jo Daviess County51.5 years 4. Henderson County50.2 years 5. Schuyler County49.1 years 6. Calhoun County48.8 years 7. Alexander County48 years 8. Putnam County47.4 years 9. Hancock County46.9 years 10. Gallatin County46.7 years

Source: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates. Only cities covered by GIS Map with at least 1,000 residents are ranked. Estimates carry margins of error.

Citing this page: GIS Map, “Oldest Cities in Illinois by Median Age”, https://gismap.land/rankings/illinois/oldest-cities. Figures from U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates.

Oldest Cities in Illinois by Median Age

Top Illinois Counties

More Illinois rankings