There are over 1,600 buildings, sites, districts, and objects in Kansas listed on the National Register of Historic Places in Kansas. NRHP listings appear in 101 of the state's 105 counties.

Iola is the county seat of Allen County, Kansas, United States. The city is situated along the Neosho River in southeast Kansas. As of the 2020 census, the population of the city was 5,396. It is named in honor of Iola Colborn, the wife of Josiah Colborn, one of the town's founders.