Just checked on this, and the USFL/WFL is indeed the longest continuously running publicly listed user created league in all of MFN.

Anarchy and Paydirt were created earlier, but have had some stoppages from running short of owners. They are both in their 16th seasons; we are about to finish our 17th.

The original NCAA league is also in it's 17th season, but is not a publicly listed league. Their timetable is so close to ours, I am not sure who started first.

When a couple more MFN and Custom leagues get deleted, we will actually be on the first page of the League List.