The NNL split the season into two halves. St. Louis won the first half, Detroit won the second half. The teams met at the end of the season in a best-of-7 playoff series to determine the Champion.
DET 3
STL 4
Champ
STL
1930 NNL1 Champion St. Louis Stars
z: best record, c: conference winner, y: division winner, w: wildcard, x: clinched playoff spot
Pennant was decided via a split-season schedule with the winner of the first half of the season playing the winner of the second half of the season, unless one team won both halves