| 1973-74 | Alberta Oilers became Edmonton Oilers |
| 1973-74 | Chicago Cougars switched from Western to Eastern Division |
| 1973-74 | New York Raiders became New York Golden Blades |
| 1973-74 | New York Golden Blades became Jersey Knights |
| 1973-74 | Ottawa Nationals became Toronto Toros |
| 1973-74 | Philadelphia Blazers became Vancouver Blazers |
| 1973-74 | Vancouver Blazers switched from Eastern to Western Division |
| 1974-75 | Realigned into three divisons |
| 1974-75 | Indianapolis Racers began play |
| 1974-75 | Jersey Knights became San Diego Mariners |
| 1974-75 | Los Angeles Sharks became Michigan Stags (Detroit) |
| 1974-75 | Michigan Stags became Baltimore Blades |
| 1974-75 | Phoenix Roadrunners began play |
| 1975-76 | Baltimore Blades folded |
| 1975-76 | Chicago Cougars folded |
| 1975-76 | Cincinnati Stingers began play |
| 1975-76 | Denver Spurs began play |
| 1975-76 | Denver Spurs became Ottawa Civics |
| 1975-76 | Ottawa Civics folded after 41 games |
| 1975-76 | Minnesota Fighting Saints folded after 59 games |
| 1975-76 | Vancouver Blazers became Calgary Cowboys |
| 1976-77 | Realigned into two divisions down from three |
| 1976-77 | Cleveland Crusaders became Minnesota Fighting Saints (2nd) |
| 1976-77 | Minnesota Fighting Saints (2nd) folded after 42 games |
| 1976-77 | Toronto Toros became Birmingham Bulls |
| 1977-78 | Realigned into one division down from two |
| 1977-78 | Calgary Cowboys folded |
| 1977-78 | Phoenix Roadrunners folded |
| 1977-78 | San Diego Mariners folded |
| 1978-79 | Houston Aeros folded |
| 1978-79 | Indianapolis Racers folded after 25 games |
| |
| Alberta | Alb | Alberta Oilers (1972-73) |
| Baltimore | Bal | Baltimore Blades (1974-75) |
| Birmingham | Bir | Birmingham Bulls (1976-77 - 1978-79) |
| Cal Cowboys | CaC | Calgary Cowboys (1975-76 - 1976-77) |
| Chi Cougars | ChC | Chicago Cougars (1972-73 - 1974-75) |
| Cincinnati | Cin | Cincinnati Stingers (1975-76 - 1978-79) |
| Cle Crusaders | ClC | Cleveland Crusaders (1972-73 - 1975-76) |
| Denver | Den | Denver Spurs (1975-76) |
| Edmonton | Edm | Edmonton Oilers (1973-74 - 1978-79) |
| Houston | Hou | Houston Aeros (1972-73 - 1977-78) |
| Indianapolis | Ind | Indianapolis Racers (1974-75 - 1978-79) |
| Jersey | Jer | Jersey Knights (1973-74) |
| LA Sharks | LAS | Los Angeles Sharks (1972-73 - 1973-74) |
| Michigan | Mic | Michigan Stags (1974-75) |
| Min F Saints | MiF | Minnesota Fighting Saints (2nd) (1976-77) |
| Min Ftg Snts | MFS | Minnesota Fighting Saints (1972-73 - 1975-76) |
| NY Gld Blades | NYG | New York Golden Blades (1973-74) |
| NY Raiders | NRa | New York Raiders (1972-73) |
| New England | NE | New England Whalers (1972-73 - 1978-79) |
| Ott Civics | OtC | Ottawa Civics (1975-76) |
| Ott Nationals | OtN | Ottawa Nationals (1972-73) |
| Phi Blazers | PhB | Philadelphia Blazers (1972-73) |
| Pho Rdrunners | PhR | Phoenix Roadrunners (1974-75 - 1976-77) |
| Quebec | Que | Quebec Nordiques (1972-73 - 1978-79) |
| San Diego | SD | San Diego Mariners (1974-75 - 1976-77) |
| Tor Toros | ToT | Toronto Toros (1973-74 - 1975-76) |
| Van Blazers | VaB | Vancouver Blazers (1973-74 - 1974-75) |
| Winnipeg | Win | Winnipeg Jets (1972-73 - 1978-79) |
