Tilden is a village in Randolph County, Illinois, United States. The population was 934 at the 2010 census. Tilden is located at 38°12′45…Tilden is a village in Randolph County, Illinois, United States. The population was 934 at the 2010 census. Tilden is located at 38°12′45″N 89°41′00″W / 38.212516°N 89.683293°W. According to the 2010 census, Tilden has a total area of 0.981 square miles, of which 0.97 square miles is land and 0.011 square miles is water.