St. Clair County is the ninth most populous county in Illinois, located in the southwestern part of the state along the Mississippi River bordering Missouri. Located directly east of St. Louis, the county is part of the Metro East region of the Greater St. Louis metropolitan area. As of the 2020 United States census, St. Clair County had a population of 257,400, making it the third most populous county in Illinois outside the Chicago metropolitan area. Belleville is the county’s seat and largest city.
Monroe County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 34,962. Its county seat and largest city is Waterloo.
Madison County is a county in the U.S. state of Illinois. It is a part of the Metro East in southern Illinois. According to the 2020 census, it had a population of 264,776, making it the eighth-most populous county in Illinois and the most populous in the southern portion of the state. The county seat is Edwardsville, and the largest city is Granite City.
Metro East is a region in southern Illinois that contains eastern and northern suburbs and exurbs of St. Louis, Missouri, United States. It encompasses five Southern Illinois counties in the St. Louis Metropolitan Statistical Area. The region's most populated city is Belleville, with 45,000 residents. The Metro East is the second largest urban area in Illinois after the Chicago metropolitan area and, as of the 2000 census, the population of the Metro East statistical area was 599,845 residents, a figure that had risen to above 700,000 in 2010. The significant growth in the Metro East is mainly due to people in smaller outlying towns in Illinois moving to the area for better economic/job opportunities.
This is a list of properties and districts in Illinois that are on the National Register of Historic Places. There are over 1,900 in total. Of these, 85 are National Historic Landmarks. There are listings in all of the state's 102 counties.
This National Park Service list is complete through NPS recent listings posted February 17, 2023.
This is a list of the National Register of Historic Places listings in St. Clair County, Alabama.
The following is a list of Registered Historic Places in St. Clair County, Michigan.
This National Park Service list is complete through NPS recent listings posted February 17, 2023.
This is a list of the National Register of Historic Places listings in Sanilac County, Michigan.
Lakeport State Park is a public recreation area on the shores of Lake Huron in St. Clair County, Michigan. The state park consists of two units on either side of the community of Lakeport within Burtchville Township. Two campgrounds, beachfront, and camp store are on the north side, and a picnic area and beachfront are on the south side.
Rocky Fork State Park is a public recreation area located in Highland County, Ohio, United States. The state park's central feature is 2,080-acre (840 ha) Rocky Fork Lake and its 31 miles (50 km) of shoreline. The lake was added to the state park system in 1950. The park offers marinas, boat ramps, swimming beaches, picnic areas, hiking trails and nature center. Two significant archaeological sites dating from the Hopewellian period are located in the park, the Rocky Fork Park Group and the Rocky Fork Park Site.
The 12th congressional district of Illinois is a congressional district in the southern part of U.S. state of Illinois. It has been represented by Republican Mike Bost since 2015.
Frank Holten State Recreation Area is an urban Illinois state park on 1,080 acres (437 ha) in unincorporated Centreville Township, St. Clair County, Illinois, United States. It is located less than five miles southeast of the Gateway Arch in Greater St. Louis. The park is bisected by Interstate 255.
Baldwin Lake State Fish and Wildlife Area is an Illinois state park on 2,018 acres (817 ha) in Randolph and St. Clair County, Illinois, United States.
Kaskaskia River State Fish and Wildlife Area is an Illinois state park on 20,000 acres (8,094 ha) in St. Clair, Monroe, and Randolph Counties, Illinois, United States. A focus of this conservation area is Baldwin Lake, a perched cooling pond managed by the Illinois Department of Natural Resources for fishing.
This is a list of the National Register of Historic Places listings in St. Clair County, Illinois.
Imbs is an unincorporated community in Stookey Township, St. Clair County, Illinois, United States. Imbs is 4.5 miles (7.2 km) southeast of Cahokia.
Westview is an unincorporated community in Stookey Township, St. Clair County, Illinois, United States. Westview is located on Illinois Route 163, 7 miles (11 km) south-southeast of East St. Louis.
North Dupo is an unincorporated community in Sugarloaf Township, St. Clair County, Illinois, United States. North Dupo is located along Illinois Route 3 south of Cahokia and north of Dupo, bordering both villages. The Pierre Martin House, which is listed on the National Register of Historic Places, is located in North Dupo.
Signal Hill is an unincorporated community in Centreville Township, Stookey Township, and the city of Belleville, St. Clair County, Illinois, United States. Signal Hill is located on Illinois Route 157, approximately 11 miles (18 km) southeast of St. Louis, Missouri. Signal Hill dates back to 1904, during the Saint Louis World Fair, when the Signal Hill Park addition was platted. The tree-lined, island separated, boulevard is the centerpiece of the community filled with large, elegant homes dated to the creation of the community.
United States 
Illinois 
St. Clair and Madison 
