South Riley Post Office (historical) USGS Riley Quad, Illinois, Topographic Map

South Riley Post Office (historical) is a Post Office in the state of Illinois (county of McHenry), located at latitude - longitude coordinates (also known as lat-long or GPS coordinates) of N 42.16836 and W -88.64648. South Riley Post Office (historical) is shown in the center of the topographic (topo) map, which is sourced from the United States Geographical Survey map USGS Riley quad. The nearest major town is Genoa, IL.