- Make (Years In Operation) – Plant
-
- Models
- R and V Knight (1920-1924) – East Moline, IL
- R
- J
- H
- Raleigh (1921-1922) – Bridgeton, NJ
- A-6-60
- Ranger (1920-1922) – Houston, TX
- No models named
- Rauch and Lang Electric (1905-1928) – Chicopee Falls, MA
- B-36
- C-45
- C-55
- B-46
- C-505
- B-68
- S-68
- Red Bug (1924-1930) – North Bergen, NJ
- No models named
- Rees (1921) – Attica, OH
- No models named
- Reo (1905-1936) – Lansing, MI
- The Fifth
- T1-6
- Flying Cloud
- Flying Cloud Mate
- Flying Cloud Master
- 15
- 20
- 25
- 30
- 35
- 6-21
- 8-21
- 8-25
- 8-31
- 8-35
- Royale
- Revere (1918-1926) – Logansport, IN
- A
- C
- D
- M
- 25
- Richelieu (1922-1923) – Ashbury Park, NJ
- T-85
- Rickenbacker (1922-1927) – Detroit, MI
- Six
- B
- C
- Eight
- 6-70
- 8-80
- 8-90
- Roamer (1916-1929) – Kalamazoo, MI
- C-6-54
- D-4-75
- 6-45-E
- 4-75-E
- 6-54
- 8-88
- 6-50
- Rockne (1932-1933) – Detroit, MI
- 65
- 75
- Six
- Rollin (1924-1925) – Cleveland, OH
- G
- Rolls-Royce (1921-1935) – Springfield, MA
- Silver Ghost
- Phantom I
- Phantom II
- Romer (1921) – Danvers, MA
- Six
- Roosevelt (1929-1930) – Indianapolis, IN
- Eight
- Rotary (1921-1923) – Hoboken, NJ
- No models named
- Ruxton (1929-1930) – St. Louis, MO
- Eight
- Models
