Holtsville is a city located in New York. Holtsville has a 2020 population of 19,365. Holtsville is currently declining at a rate of 0.00% annually and its population has decreased by -1.77% since the most recent census, which recorded a population of 19,714 in 2010. Holtsville reached it's highest population of 20,258 in 2016.
The average household income in Holtsville is $121,772 with a poverty rate of 5.43%. The median rental costs in recent years comes to $1,642 per month, and the median house value is $355,800. The median age in Holtsville is 43.9 years, 43.7 years for males, and 44.1 years for females. For every 100 females there are 97.4 males.