It really depends on how precise your definitions are. Obviously there were no Diku muds around before 1990, and Gemstone was still on version 2. LPmud wasn't written until April 1989, although Nanvaent also opened later that year and is still running. Apart from that, the only pre-1990 mud I can of is MUD itself, of which there is currently "an accurate reconstruction" running today.
The most popular muds seem to be those which were written in the early-to-mid 90s. The pre-1990 muds were generally pretty clunky and old fashioned, as mudding hadn't really reached it's "golden age" yet.
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