Merrillville is a town located in the U.S. state of Indiana. It is within Lake County in Ross Township part of the Chicago metropolitan area. It has a total area of 33.25 square miles at 41°29′8″N 87°20′7″W. The elevation is 656 feet above sea level. As of the 2010 census data, it had a total population of 35,246. The population density was 1,053.66/sq mi. Estimated per capita income in 2016 was $26,408. It has Zip code 46410.