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 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. It is also home to the historic Eagles Theatre, Paradise Spring Treaty Grounds, the Wabash and Erie Canal, Presbyterian Church, and Disciples of Christ Christian Church. A seasonal classic root-beer stand sits atop the man made geographic cut directly south of the Wabash river, and attracts locals to its traditional car-side service.