In 2018, Islandia, NY had a population of 3.35k people with a median age of 37.5 and a median household income of $95,379. Between 2017 and 2018 the population of Islandia, NY declined from 3,352 to 3,345, a -0.209% decrease, and its median household income grew from $90,966 to $95,379, a 4.85% increase. The 5 largest ethnic groups in Islandia, NY are White (Non-Hispanic) (44.1%), White (Hispanic) (16.2%), Black or African American (Non-Hispanic) (10.5%), Asian (Non-Hispanic) (9.99%), and Other (Hispanic) (9.66%). NaNk% of the people in Islandia, NY speak a non-English language, and 92.1% are U.S. citizens.