Info from the FCC ULS July 30 2012
483.2875 - license issued to Newton, City of - 20K0F3E repeaters at - 515 Canton in Milton, 338 Washington in Brookline, 60 Concord in Belmont, 99 Main St in Winthrop, 26 Quincy St in Quincy, 40 Pauline in Winthrop, 150 Waban Hill Road in Newton, and at Logan Airport
also there is a 60/238 FB2 licensed at 1163 Centre St in Newton Centre and a 225/597 FB2 licensed at West Side Fire Station Lockland Road in Winchester
Weymouth also has a FB 30/189 on 483.2875 at 636 Broad St in Weymouth
I suspect that the real repeater sites are Newton (Waban Hill Road) and Winchester
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483.3125 - same as 483.2875 - plus FB at 59 The Fenway in Boston (the BFD dispatch center) - 2002 had a temporary license with an attachment that stated 3 new repeater sites were being added to the 1 legacy site - (Needham + Saugus + Ricutti Drive in Quincy) - I dont see those sites actively licensed in 2012