Lenapah is a town in north central Nowata County, Oklahoma, United States, eleven miles north of Nowata and sixty two miles northeast of Tulsa. Its name is an adaptation of Lenape, the name of a Delaware Tribe of Indians. The population was 293 at the 2010 census, a 1.7 percent decrease from the figure of 298 recorded in 2000.

Nowata County is a county located in northeastern Oklahoma, United States, on the Kansas border. As of the 2020 census, its population is 9,320. Its county seat is Nowata. Their name is derived from a Delaware word, no-we-ata, meaning "come here" or "welcome".