- Allegheny RU
- Big 10
- Big Rivers
- Cardinals CRC
- Colonial Coast
- Deep South
- Florida CRC
- Gateway CRC
- Georgia RU
- Gold Coast CRC
- Great Lakes CRC
- Great Midwest CRC
- Great Plains CRC
- Heart of America
- High Peaks CRC
- Lake Effect Conference
- Liberty
- Lonestar
- Mid-America RFU
- Mid-American
- Mid Atlantic
- Mid-South
- NCR Independent
- NERFU
- New England Wide
- Northern California CRC
- Northern Lights CRC
- Northwest CRC
- Rocky Mountain RFU
- Rugby East
- Southeastern CRC
- Southern CRC
- Tri-State CRC
- Upstate NY CRC
