I
L
M
N
O
P
Q
R
S
- [[Seaboard Football League
■Semi-Pro Football League
■Sevenman Tackle Football League
■Six-Man Football Association
■South Central Football League
■South Texas Amateur Football League
■South West Football League
■Southeast Football League
■Southeastern American Football League
■Southern American Football League
■Southern American South Football League
■Southern California Football League
■Southern Football League
■Southern Indoor Football League
■Southern Kansas Football League
■Southern Plains Football League
■Southern States Football League
■Southwest Football Conference
■Southwest Football League
■Southwest Football League of Texas
■Spring Football League
■Stadium Football League
■Sunshine State Football League
T
■TX/LA Southwest Football Association
■Tennessee Amateur Football League
■Texas International Football League
■Texas United Football Association
■Texas United Football League
■Total Impact Football League
■Tri-State Football League
■Tri-States Football League
U
■U.S. Amateur Football Federation
■U.S. Indoor Football League
■U.S. Inside Football League
■Ultimate Football League
■Ultimate Indoor Football League
■United American Football League
■United Florida Football League
■United Football Alliance League
■United Football Alliance of Texas
■United Football League (1961)
■United Football League of Florida
■United Indoor Football
■United National Gridiron League
■United Professional Football League
■United South Carolina Football League
U cont.
■United South Football League
■United States Amateur Football Federation
■United States Football Alliance
■United States Football League
■United States Independent Football League
■Utah Football League
■Utah Indoor Football League
V
■Virginia-Carolina Football League
W
■Washington Football League
■West Coast Football Association
■West Coast Football League
■West Coast Public Safety Football League
■West Texas Football League
■Western Interprovincial Football Union (WIFU)
■Western States Football League
■Western Washington Football Alliance
■Wild West Football League
■Wisconsin State Football League
■World Football League
■World Football League (2008)
■World Indoor Football League (2007)
■World League of American Football
X
■XFL
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