The office at this location is the municipal government headquarters of Algonquin Township. It is the largest township in McHenry County, emcompassing Algonquin, Barrington Hills, Cary, Crystal Lake, Fox River Grove, Lake In The Hills, Village of Port Barrington, Lakewood, Oakwood Hills and Trout Valley. The township office houses various town departments, including the township clerk and assesor's and supervisor's offices. The assesor's office stays open until 5pm on weekdays.