Middlesex Beach Association Home Owners Association Middlesex Beach Association Visit Website Request Info Bethany Beach, DE 19930 (410) 524-1500 About Map About Homeowners Association for Middlesex Beach Association - Community Patrol # 302.339.2319Middlesex Beach (MBA) is a private beach community on the lower Delaware coast of the Atlantic Ocean near Bethany Beach, Delaware. What's Nearby? Distance: 5 10 15 20 25 50 mi.