Kismet is a city in Seward County, Kansas, United States. As of the 2020 census, the population of the city was 340. It is located along U.S. Ro…Kismet is a city in Seward County, Kansas, United States. As of the 2020 census, the population of the city was 340. It is located along U.S. Route 54 highway. The first post office in Kismet was established in November 1888.