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It would be awesome, but there is no global Catholic Mass timetable. for the united states, MassTimes.org is the usual best bet, with going to a particular diocese' website and hoping that they have links parishes you want.
Lots of parishes post their bulletins to SeekAndFind.com so you can build a list of mass times from that. But that's way, way, way to cumbersome.
Personally, I'd be very interested in making a parish-life aggregator as an open source application because I don't think one exists.