SVG map of Cape Cod (Barnstable County) and the Islands of Martha's Vineyard (Duke's County) and Nantucket (Nantucket County).
Equirectangular projection, N/S stretching 130.0 %. 
Geographic limits of the map:

Northern boundary: 42.10° N
Southern boundary: 41.21° N
Western boundary: 70.98° W
Eastern boundary:  69.82° W1px = .00381 deg long  

1px = .00293 deg lat
Own work
Grolltech