Using monthly fees for semiprivate rooms as a guide, Buffalo Grove’s assisted living costs are the highest in the state, about 25.7% more than the Illinois average ($6,235). Average costs across the country ($7,756) are lower than Buffalo Grove’s, although the difference is only 4%. Seniors in Rockford have the most affordable fees in the area, paying approximately $5,825 per month, while their peers in Kankakee are more likely to pay $6,540. In Peoria, costs rise to $6,737 per month, while seniors and families in Bloomington need to budget about $6,996 for their assisted living services.