If you’re ready to start organizing your Mastic Beach adventure, we can fill you in on the basics — before you collect a rental car!This town sits 16 miles to the east of West Sayville, and 255 miles northeast of Washington, the nation’s capital.If you’re looking to make some new pals while you’re staying in this part of Suffolk County, you shouldn’t have too many issues. Around 14,800 people reside here.