Wilmette cost of living score 105.7 More expensive 5.7% higher than the US average 12.8% higher than the Illinois average Wilmette, Illinois gets a BestPlaces Cost of Living score of 105.7, which means the total cost of housing, food, childcare, transportation, healthcare, taxes, and other necessities is 5.7% higher than the U.S. average and 12.8% higher than the average for Illinois.