Hartford, WI has a population of 14,350 and is the 2,931st largest city in the United States. The population density is 1,778 per sq mi which is 1933% higher than the Wisconsin average and 1862% higher than the national average. The median age in Hartford is 38 which is approximately 3% lower than the Wisconsin average of 39. In Hartford, 62% of the population over 15 years of age are married, 95% speak English and 2% speak Spanish. 80% of Hartford residents were born in Wisconsin, 17% were born out of state, 0% were born outside of the United States and 3% were foreign born.