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.
|Southern Light Fiber||1000||800||1.3|
|American Fiber Systems||1000||540||1.9|
|IP Networks Inc||400||40||10.0|
|Edison Carrier Solutions||3000||115||26.1|
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.
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