St. John is a town in Lake County, Indiana, United States. The town of St. John has homes in St. John Township, Hanover Township, and Center Township. St. John was founded in 1837. The population was 14,850 at the 2010 census. In 2009, St. John ranked 48th among CNN's top 100 places to live in the United States. In 2014, St. John was ranked as the 4th safest place in Indiana by Movoto Real Estate.HistoryThe St. John post office was established in 1846. The town was named for John Hack, a pioneer settler.The Francis P. Keilman House was listed in the National Register of Historic Places in 2013.GeographySt. John is located at.According to the 2010 census, St. John has a total area of 11.481sqmi, of which 11.39sqmi (or 99.21%) is land and 0.091sqmi (or 0.79%) is water.Demographics2010 censusAs of the census of 2010, there were 14,850 people, 5,047 households, and 4,225 families residing in the town. The population density was 1303.8PD/sqmi. There were 5,201 housing units at an average density of 456.6/sqmi. The racial makeup of the town was 93.5% White, 1.3% African American, 0.1% Native American, 1.3% Asian, 0.1% Pacific Islander, 2.4% from other races, and 1.2% from two or more races. Hispanic or Latino of any race were 8.2% of the population.