Schools in Mason City, Illinois, the US. Schools locations in Mason City, Illinois. Find the nearest schools locations, near you. All types of business services ATM Bank Finance Insurance Lawyer Real estate School All schools in Mason City Illini Central Grade School School +1 217-482-5180 208 Northwest Avenue, Mason City, Illinois 62664 Write a review Phone Website Directions Illini Central School District 189 School +1 217-482-5180 208 Northwest Avenue, Mason City, Illinois 62664 Write a review Phone Website Directions