Fish Lake, IN has a population of 1,346 and is the 13,339th largest city in the United States. The population density is 874 per sq mi which is 387% higher than the Indiana average and 864% higher than the national average. The median age in Fish Lake is 48 which is approximately 29% higher than the Indiana average of 37. In Fish Lake, 64% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 65% of Fish Lake residents were born in Indiana, 35% were born out of state, 0% were born outside of the United States and 0% were foreign born.