Village of Lake in the Hills. Lake in the Hills (often abbreviated L.I.T.H. or LITH) is a village in McHenry County, Illinois, United States. The population was 23,152 at the 2000 census. A 2006 special census put the village's population at 29,175. As of the 2010 census, the population declined from the 2006 figure to 28,165.