Here we can see a simple outline of the cost of living in Oak Forest, IL. As you can see, with the average cost of living in Oak Forest, IL being 101, that puts it 3% higher than the average of Illinois and 1% higher than our nation's average. This simple outline of the cost of living index was formulated using prices of: goods and services (weighted 33%), housing prices (weighted 30%), groceries (weighted 13%), utilities (weighted 10%), transportation (weighted 9%), and health care (weighted 5%). Thus, goods/services, along with housing influences the majority of the cost of living index. The price of daily goods and services is a valuable and reliable number to be aware of when considering the general price of the city's goods. In the case of Oak Forest, IL, the price of goods and services are 1% lower than the average of Illinois as well as 4% lower than the nation's average.