Hillsboro is a city in Marion County, Kansas, United States. As of the 2020 census, the population of the city was 2,732. The city was named aft…Hillsboro is a city in Marion County, Kansas, United States. As of the 2020 census, the population of the city was 2,732. The city was named after John Hill, who homesteaded in the area in 1871. Hillsboro is the home of Tabor College.
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