What is the cost of living in Oak Brook, IL?
According to the most recent data on the cost of living, Oak Brook has an overall cost of living index of 201, which is 2.0x higher than the national index of 100.
Compared to Illinois, Oak Brook has a cost of living index that's 2.1x higher than Illinois's index of 98.
The standard of living in Oak Brook ranks as #333 most affordable out of the 336 places we measured in Illinois. By definition, that implies Oak Brook ranks as the #3 most expensive place in the Prairie State.
For more reading on life in Oak Brook, check out:
Oak Brook Cost Of Living Vs. Illinois
Six factors go into calculating the cost of living index in Oak Brook. Here is how it fares on each of the criteria:
The Services index in Oak Brook is 104.
The Groceries index in Oak Brook is 98.
The Health index in Oak Brook is 431.
The Housing index in Oak Brook is 105.
The Transportation index in Oak Brook is 102.
The Utilities index in Oak Brook is 100.
| Living Expense | Oak Brook | Illinois | National Average |
|---|---|---|---|
| Overall | 201 | 98 | 100 |
| Services | 104 | 99 | 100 |
| Groceries | 98 | 99 | 100 |
| Health | 431 | 96 | 100 |
| Housing | 105 | 101 | 100 |
| Transportation | 102 | 99 | 100 |
| Utilities | 100 | 101 | 100 |
Oak Brook Cost Of Living Compared To Illinois Averages
Index where 100 = national average. Source: cost-of-living index 2026.
For more reading on cost of living around Illinois, check out:
Protect your home budget Compare home warranties in Oak Brook Get matched →Source: Cost-of-living index 2026, normalized to US average = 100
Oak Brook, IL Housing Cost Breakdown
Housing swings affordability the most between places in Illinois, so we broke down housing costs into more detail. Home and income data comes from the most recent US Census ACS 2020-2024. The key points are:
The Median Home Value in Oak Brook is $966,776.
The Median Rent in Oak Brook is $2,590.
The Median Income in Oak Brook is $175,870.
The Home Value To Income in Oak Brook is 5.5x.
The Rent To Monthly Income in Oak Brook is 0.18x.
Oak Brook, IL Costs By Category
Detailed Oak Brook Services costs vs. Illinois
Detailed Oak Brook Groceries costs vs. Illinois
Detailed Oak Brook Health costs vs. Illinois
Detailed Oak Brook Transportation costs vs. Illinois
Oak Brook SnackAbility
Cost Of Living In Cities Around Oak Brook
The cost of living varies in the cities and towns around Oak Brook. Here's a quick look at the cost of living in the most populous nearby places:
Arlington Heights, IL has a cost of living index of 125, 0.6x Oak Brook.
Wheaton, IL has a cost of living index of 127, 0.6x Oak Brook.
Glenview, IL has a cost of living index of 146, 0.7x Oak Brook.
| City | Population | Cost Of Living | Vs. Oak Brook |
|---|---|---|---|
| Arlington Heights, IL | 76,005 | 125 | 0.6x |
| Wheaton, IL | 53,557 | 127 | 0.6x |
| Glenview, IL | 47,752 | 146 | 0.7x |
| Elmhurst, IL | 45,671 | 134 | 0.7x |
| Lombard, IL | 43,619 | 117 | 0.6x |
| Bartlett, IL | 40,501 | 119 | 0.6x |
| Park Ridge, IL | 38,667 | 135 | 0.7x |
| Glen Ellyn, IL | 28,390 | 137 | 0.7x |
| Westmont, IL | 23,724 | 115 | 0.6x |
| Villa Park, IL | 22,345 | 112 | 0.6x |
