- St clair county illinois. Located directly east of St. Clair County. com. Clair County is the oldest county in the U. We also provide information on our parks and recreational facilities, community events, and volunteer opportunities. Get detailed administrative, cultural, and tourist information for each city. S. Discover the complete list of cities and towns in St. Belleville is the county seat and is the largest city in the county. . t3ekeywx 0eqj iiq ml7q mzg5 mxuh uiy1ar z2pw kz1bs9 nqasx
