Here it is. 55 is what Cape Cod has for it's nation ID in my world. Everything appears to work fine when I create a Cape league. Everyone is generated from the following towns.
Barnstable,4298,55,Massachusetts,41.70,-70.30
Centerville,9190,55,Massachusetts,41.65,-70.34
Cotuit,2364,55,Massachusetts,41.62,-70.44
Hyannis,14120,55,Massachusetts,41.65,-70.29
Marstons Mills,8017,55,Massachusetts,41.67,-70.40
Osterville,2911,55,Massachusetts,41.65,-70.38
Bourne,1284,55,Massachusetts,41.72,-70.61
Buzzards Bay,3250,55,Massachusetts,41.75,-70.61
Monument Beach,1842,55,Massachusetts,41.71,-70.60
Pocasset,2756,55,Massachusetts,41.69,-70.63
Sagamore,2589,55,Massachusetts,41.78,-70.53
Brewster,1818,55,Massachusetts,41.76,-70.08
Chatham,3420,55,Massachusetts,41.67,-69.96
Dennis,11083,55,Massachusetts,41.70,-70.16
Dennis Port,2775,55,Massachusetts,41.66,-70.13
Eastham,4462,55,Massachusetts,41.83,-69.98
Falmouth,14001,55,Massachusetts,41.54,-70.60
Teaticket,1856,55,Massachusetts,41.55,-70.58
Woods Hole,925,55,Massachusetts,41.31,-70.39
Harwich,8533,55,Massachusetts,41.69,-70.07
Harwich Port,1742,55,Massachusetts,41.66,-70.06
Mashpee,6831,55,Massachusetts,41.61,-70.48
Mashpee Neck,901,55,Massachusetts,41.36,-70.27
Monomoscoy Island,152,55,Massachusetts,41.34,-70.30
New Seabury,815,55,Massachusetts,41.34,-70.28
Popponesset,310,55,Massachusetts,41.34,-70.27
Popponesset Island,39,55,Massachusetts,41.35,-70.27
Seabrook,477,55,Massachusetts,41.34,-70.29
Seconsett Island,81,55,Massachusetts,41.34,-70.30
Orleans,1699,55,Massachusetts,41.79,-70.00
Provincetown,3374,55,Massachusetts,42.05,-70.17
Sandwich,6169,55,Massachusetts,41.75,-70.49
Forestdale,2833,55,Massachusetts,41.68,-70.50
Truro,1573,55,Massachusetts,42.01,-70.07
Wellfleet,2493,55,Massachusetts,41.91,-70.02
Yarmouth,15765,55,Massachusetts,41.67,-70.22
Yarmouth Port,4271,55,Massachusetts,41.70,-70.22
Aquinnah,201,55,Massachusetts,41.37,-70.83
Chilmark,650,55,Massachusetts,41.36,-70.74
Menemsha,197,55,Massachusetts,41.36,-70.75
Edgartown,3062,55,Massachusetts,41.38,-70.53
Chappaquiddick Island,172,55,Massachusetts,41.22,-70.28
Gosnold,98,55,Massachusetts,41.43,-70.85
Cuttyhunk,52,55,Massachusetts,41.25,-70.55
Oak Bluffs,2804,55,Massachusetts,41.43,-70.58
Tisbury,4824,55,Massachusetts,41.45,-70.61
Vineyard Haven,1762,55,Massachusetts,41.45,-70.60
Nantucket,3069,55,Massachusetts,41.28,-70.10