I assume you mean stations owned by an anarchy faction? In that case you can filter the GalMap for anarchy systems. The controlling station in such a system will be owned by an anarchy faction.
However, in any system that has one or more anarchy factions it is possible that they obtained ownership of one of the other stations. In that case you can not find them via the GalMap anarchy filter but in EDDB you can search for them here:
https://eddb.io/station if you set the 'Governnent' field to Anarchy and the 'Min Landing Pad' field to M or L depending on the size of your ship.