Islip is a city located in New York. Islip has a 2020 population of 329,810. Islip is currently declining at a rate of -0.17% annually and its population has decreased by -1.80% since the most recent census, which recorded a population of 335,861 in 2010. Islip reached it's highest population of 336,716 in 2011.
The average household income in Islip is $114,562 with a poverty rate of 7.83%. The median rental costs in recent years comes to $1,675 per month, and the median house value is $356,800. The median age in Islip is 38.3 years, 36.8 years for males, and 39.8 years for females. For every 100 females there are 97.6 males.