Hackney is an unincorporated community in Cowley County, Kansas, United States. The town was named after William P. Hackney, a colorful frontier lawyer and politician from Cowley County. Hackney was a station and shipping point on the Atchison, Topeka and Santa Fe Railway. The post office was established March 31, 1894, and discontinued Febru…Hackney is an unincorporated community in Cowley County, Kansas, United States. The town was named after William P. Hackney, a colorful frontier lawyer and politician from Cowley County. Hackney was a station and shipping point on the Atchison, Topeka and Santa Fe Railway. The post office was established March 31, 1894, and discontinued February 15, 1924.