For all intents and purposes, Colon is considered to be part of the ZMQ (Zona Metropolitana de Queretaro)^1
Funny thing the english wikipedia article does not even mention it. But yeah, Each of those Cloud providers, have at least 3 buildings distributed on multiple industrial parks in the metropolitan area and I'm not even mentioning the ones from Kio Networks, IBM (SoftLayer). We are one step away from having one from OVH and Hetzner.
The only data center I know that is in the middle of the city of Queretaro is the one from Triara (aka Telmex, one of the many companies from Carlos Slim). Most of them are in the outskirts of the urban area.
If you check the link in my comment these are not the data centers close to the city which everyone knows but newer ones in Colón.