 Its population was still reported as 125 for the 2000 Decennial Census.Elroy serves as the principal site of a state-of-the-art FIA specification Circuit of the Americas motor sport facility that currently hosts the World Endurance Championship, MotoGP, and the Formula 1 United States Grand Prix.Elroy is home to the historic Moline Swedish Lutheran Cemetery, and other sites of Swedish-Texan heritage.