Johnson City is a city in and the county seat of Stanton County, Kansas, United States. As of the 2020 census, the population of the city was …Johnson City is a city in and the county seat of Stanton County, Kansas, United States. As of the 2020 census, the population of the city was 1,464. Johnson City was established in 1885; it was originally called Veteran because many of its founders were Civil War veterans. It was renamed Johnson City in 1886, in honor of A. S. Johnson, a railroad official.