User blog comment:FairyRaven/Fairy Tail Chapter 416: Tartarus Arc: Final Part, Review and Commentary/@comment-25111584-20150120141518/@comment-9595671-20150121090853

I just looked at the latest chapter on CrunchyRoll, it states they have 130,000

Considering the jobs at the guild, I feel this makes a bit more sense than 13,000