We understand you’re raring to hit the road, but it’s good to know a few things about where you’re headed! Here are some basic details about East Islip.This town sits 4 miles to the west of West Sayville, and 242 miles northeast of Washington, the nation’s capital.Facts and stats intrigue you? Like to know roughly how many people live in this area of Suffolk County before you go on your road trip? At the last count, the population was 14,500.