Wabash is a city in Noble Township, Wabash County, in the U.S. state of Indiana. The population was 10,666 at the 2010 census. The city is situated along the Wabash River in the county seat of Wabash County. Wabash is notable as claiming to be the first electrically lighted city in the world, which was inaugurated on March 31, 1880. However, closer inspection of the reference shows only the court house grounds were lighted.