Genesee County B League
The Genesee County B League was a high school sport league in Genesee County Michigan that operated in the mid to late 20th century.
| High School | Join Year | From | Left | league left to |
| Ainsworth | 1954 | 1961 | Big Nine Conference | |
| Atherton | 1960 | 1976 | Mid-Eastern Eight Conference | |
| Beecher | 1950 | 1960 | Big Nine Conference | |
| Bendle | 1950 | 1975 | Mid-Eastern Eight Conference | |
| Bentley | 1960 | 1978 | Genesee Eight | |
| Brandon | 1977 | 1978 | Five County 5 League | |
| Clio | 1950 | 1960 | Big Nine Conference | |
| Davison | 1950 | 1960 | Big Nine Conference | |
| Durand | 1964 | 1978 | Flint Metro League | |
| Fenton | 1940 | 1968 | Flint Metro League | |
| Flushing | 1950 | 1960 | Big Nine Conference | |
| Grand Blanc | 1950 | 1960 | Big Nine Conference | |
| Hartland | 1976 | 1978 | Five County 5 | |
| Kearsley | 1950 | 1960 | Big Nine Conference | |
| Lake Fenton | 1976 | 1978 | Genesee Eight | |
| LakeVille | 1956 2nd: 1964 | 1962 2nd: 1976 | Independent 2nd: Flint Metro League | |
| Linden | 1974 | 1978 | Genesee Eight | |
| Mt. Morris | 1950 | 1960 | Big Nine Conference | |
| Swartz Creek | 1960 | County C League | 1968 | Flint Metro League |