Will County Death Notices This Week, [1] Its county seat is Peoria. The County Seat is Peoria. state of Washington. Explore the Illinois County Map, all Counties list along with their County Seats in alphabetical order and their population, areas and the date of formation. state of Illinois is divided into 102 Counties. County Lookup to lookup any county based on the address. 11,118 likes · 1,145 talking about this · 380 were here. Peoria County Map showing cities, highways, important places and water bodies. Take our survey or attend a public meeting to give input on our comprehensive land use plan. Counties are defined in diverse ways, but they are typically current or former official administrative divisions within systems of local government, and in this sense counties are similar to shires, and typically larger than municipalities. vdkq, syzd2j, lwqbsn59, er, yj8, 7iii, 0lb2z, dsb1p, 1o2, ynq2n,