Most wins in a season: 81 in 1916
Most losses in a season: 49 in 1913
|1913||Portland Duffs||New England League||71||49||Roster||Stats|
|1914||Portland Duffs||New England League||70||48||Roster||Stats|
|1915||Portland Duffs||New England League||77||42||Roster||Stats|
|1916||Portland Duffs||Eastern League||81||37||Roster||Stats|
Average attendance is based upon the number of actual home dates where known (most leagues from 1992 and later). Where the number of home dates is not known, the average is calculated using half the team's total games.