Lucas is a city in Russell County, Kansas, United States. The population was 436 at the 2000 census. Lucas is well known because of attractions such as Florence Deeble's Rock Garden, the Garden of Eden created by Samuel P. Dinsmoor, the Grassroots Art Center, and the World's Largest Collection of the World's Smallest Versions of the World's Largest Things Traveling Roadside Attraction and Museum.