Lucas is a city in Russell County, Kansas, United States. As of the 2020 census, the population of the city was 332. Lucas was established a…Lucas is a city in Russell County, Kansas, United States. As of the 2020 census, the population of the city was 332. Lucas was established as the community of Blue Stem in 1877. It was renamed Lucas in 1887 after Lucas Place in St. Louis, Missouri.