Mariaville Lake, NY has a population of 481 and is the 19,769th largest city in the United States. The population density is 86 per sq mi which is 76% lower than the New York average and 5% lower than the national average. The median age in Mariaville Lake is 43 which is approximately 13% higher than the New York average of 38. In Mariaville Lake, 56% of the population over 15 years of age are married, 95% speak English and 0% speak Spanish. 79% of Mariaville Lake residents were born in New York, 12% were born out of state, 5% were born outside of the United States and 4% were foreign born.