Merton, WI has a population of 3,535 and is the 8,003rd largest city in the United States. The population density is 1,134 per sq mi which is 1197% higher than the Wisconsin average and 1151% higher than the national average. The median age in Merton is 40 which is approximately 2% higher than the Wisconsin average of 39. In Merton, 72% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 79% of Merton residents were born in Wisconsin, 17% were born out of state, 0% were born outside of the United States and 4% were foreign born.