Saha Air of Iran still fly 707s on domestic scheduled services. They're the last scheduled passenger operator.
Dodgers don't have a 707, but there are a few in executive jet config, including John Travolta'a. There are also a few still in freight service, mainly in Africa, the Middle East and South America. Search the photo database - pictures of active 707s taken in 2003 will give you a clue as to who is still operating them.