The first Professional American Football League in America that openly paid its players was the Ohio League (1902-1919). Four of its leading teams, including the Canton Bulldogs asked teams in Pennsylvania and New York State to form a National League in 1920 – thus the NFL was born.
Semi-Pro Leagues exist all over USA, organised roughly on state lines.
Below you will find a link to Irish Connections throughout the USA
New York-Penn Football Leagues
Five Star Football League; Western Pennsylvania Pro Football Circuit
New York Metropolitan Area
Semi-Pro State American Football | Five Star Football League 2010-2017
Pennsylvania League
Western Penn Pro Football Circuit (Seasons): 1895 1896
National Football League (Seasons): 1902
Picture Credit: Picture Credit: Everett Collection [Sutterstock]
Eastern Mid-West Football Leagues
Ohio League; Indiana
Ohio League
Ohio League | Champions 1903-1919
Ohio League 1915-1919 (Irish Players)
Ohio League (Seasons): 1904 1905
Indiana
Indiana State Football Championship (Seasons): 1920
Western Midwest Football Leagues
Minnesota, South Dakota & Iowa
Picture Credit: Picture Credit: . By Everett Collection[Shutterstock]
Upper South Football Leagues
Kentucky; Virginia-Carolina
Kentucky
Armco Semi-Pro Football Teams 1924-1929
Virginia-Carolina
Picture Credit: [11] Sevenman | Wayback Machine (2004) STFL Logo [Internet] Available from: https://web.archive.org/web/20021126163725im_/http://www.sevenman.com/stfllogo.gif [Accessed 13 February 2020]
Texas and Southwest Football Leagues
Sevenman Tackle Football League
Texas
Picture Credit:
Picture Credit: By Brocreative[Shutterstock]
North West Football Leagues
Washington; Oregon
Northwest Leagues (Washington & Oregon)
Pacific Northwest Football League 1980
Picture Credit: Picture Credit: Everett Collection [Sutterstock]
California Football Leagues
Pacific Coast Football League; California Winter League
California
Pacific Coast Football League 2010-2019
California Football League 1938
Salinas Packers | California Pro American Football 1936-1937
[13] Super 8 Football League (2018) Super 8 Football League Logo [Internet] Available from: http://super8footballleague.info/wp-content/uploads/2011/10/10378207_1545248759045177_2010222216677056541_n.jpg [Accessed 20 July 2019]
Pacific and SoCal-Baja California Football Leagues
Alaska; Super 8 Football League
Alaska
Alaska Football League 2015-2018
SoCal-Baja
Super 8 Football League West Coast (Arena):
Super 8 Football League West Coast 2016-Present
Super 8 Football League West Coast Series (Seasons): 2020
Super 8 Football League Baja-California-Nevada Tournaments (Arena / Outdoor):
Super 8 Football League Bowls & Tournaments 2010-Present
Arena League 2020 , Eight Man Outdoor 2020 , Battle 4 San Diego 2019 , Copa Tijuana 2017 , Winter Bowl 2014