Riley is a city in Riley County, Kansas, United States. As of the 2020 census, the population of the city was 938. Riley was originally calle…Riley is a city in Riley County, Kansas, United States. As of the 2020 census, the population of the city was 938. Riley was originally called Union, and under the latter name was founded in 1871. It was renamed Riley Center in the late 1870s. Riley was the name of a railroad employee.
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