Merrillville is a city located in Lake County, Indiana. With a 2020 population of 34,408, it is the 29th largest city in Indiana and the 1140th largest city in the United States. Merrillville is currently declining at a rate of -0.49% annually and its population has decreased by -2.38% since the most recent census, which recorded a population of 35,246 in 2010. Merrillville reached it's highest population of 35,473 in 2014. Spanning over 33 miles, Merrillville has a population density of 1,037 people per square mile.
The average household income in Merrillville is $68,953 with a poverty rate of 10.84%. The median rental costs in recent years comes to $1,051 per month, and the median house value is $132,100. The median age in Merrillville is 37.8 years, 37 years for males, and 38.7 years for females. For every 100 females there are 86.2 males.