Lucas is a city in Russell County, Kansas, United States. As of the 2010 census, the city population was 393.
Lucas is located at 39°3′32″N 98°32′15″W / 39.05889°N 98.5375°W / 39.05889; -98.5375 (39.058839, -98.537457) at an elevation of 1,489 feet (454 m). It lies in the Smoky Hills region of the Great Plains approximately 8 miles (13 km) north of Wilson Lake. Wolf Creek, a tributary of the Saline River, flows east along the southern edge of the city. Located in north-central Kansas at the junction of Kansas Highway 18 (K-18) and Kansas Highway 232 (K-232), Lucas is 115 miles (185 km) northwest of Wichita, 212 miles (342 km) west of Kansas City, and 21 miles (33.5 km) northeast of Russell, the county seat.
According to the United States Census Bureau, the city has a total area of 0.5 square miles (1.4 km²), all of it land.