There’s so much to learn about Southold, but there’s no need to feel overwhelmed. Before you pick up the keys to your rental car, let’s start off with the essentials.This town sits 25 miles to the northeast of East Moriches, and 286 miles northeast of Washington, the nation’s capital.Facts and figures interest you? Like to find out how many people live in this part of Suffolk County before you set off on your road trip? At the last count, the population was 5,700.