Lucas County U.S. county The Lucas County Courthouse in Toledo The Lucas County Courthouse in Toledo Flag of Lucas County Flag Official seal of Lucas County Seal Map of Ohio highlighting Lucas County Location within the U.S. state of Ohio Map of the United States highlighting Ohio Ohio's location within the U.S. Coordinates: 41°41′N 83°30′W Country United States State Ohio Founded June 20, 1835[1] Named for Robert Lucas Seat Toledo Largest city Toledo Area • Total 596 sq mi (1,540 km2) • Land 341 sq mi (880 km2) • Water 255 sq mi (660 km2) 43%% Population • Estimate (2018) 429,899 • Density 1,296/sq mi (500/km2) Time zone UTC−5 (Eastern) • Summer (DST) UTC−4 (EDT) Congressional districts 5th, 9th Website www.co.lucas.oh.us Lucas County is a county located in the U.S. state of Ohio and bordered on the east by Lake Erie, and on the southeast by the Maumee River, which runs to the lake. As of the 2010 census, the population was 441,815.[2] Its county seat is Toledo, located at the mouth of the Maumee River on the lake.[3] The county was named for Robert Lucas, 12th governor of Ohio, in 1835 during his second term.[4] Its establishment provoked the Toledo War conflict with the Michigan Territory, which claimed some of its area. Lucas County is named after Robert Lucas, 12th Governor of the State of Ohio and the winning governor of the Toledo War, and is the central county of the Toledo Metropolitan Statistical Area.