Middle Island is a city located in Suffolk County New York. Middle Island has a 2020 population of 10,228. Middle Island is currently declining at a rate of 0.00% annually and its population has decreased by -2.43% since the most recent census, which recorded a population of 10,483 in 2010. Middle Island reached it's highest population of 10,483 in 2010.
The average household income in Middle Island is $89,434 with a poverty rate of 8.47%. The median rental costs in recent years comes to $1,727 per month, and the median house value is $274,000. The median age in Middle Island is 45.3 years, 45.5 years for males, and 43.9 years for females.