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Several weeks ago, I took a look at the various metro fiber companies for which I could find data.  Well, it took some time, some nosing around, and some estimation, but I have what I consider my final list.  For now anyway, I will update over time I’m sure, and who knows, new information may come to light. I estimated Zayo’s metro route miles based on their acquisitions plus some rough estimations, I don’t think I’m far off.  The rest I either found a direct reference to or, in one or two cases, actually counted the dots on their public maps.

There are some interesting new names on this list, private companies I knew nothing about until working through this table.   The two with the most miles per buildings seem to be fiber networks associated with electric utilities - they go everywhere but hook up little yet.  Zayo shows up where I figured they’d be at about 4.  Joining AFS, Optimum Lightpath, and TW Telecom as the most dense networks are two I had never heard of but which I will keep an eye out for: AGL Networks and Southern Light Fiber.   Thanks to all commenters for information and leads.