| Enumerated Area | pre1851 | 1851 | 1861 | 1871 | 1881 | 1891 | 1901 | 1911 |
| Radcliffe Twp | REN | REN | REN | REN | REN | REN | ||
| Raglan Twp | REN | REN | REN | REN | REN | REN | ||
| Rainham Twp | HLD | HLD | HLD | HLD | HLD | HLD | HLD | HLD |
| Rainy Lake | TBRR | |||||||
| Rainy River Town | ALG | TBRR | ||||||
| Raleigh | TBRR | |||||||
| Raleigh Twp | KEN | KEN | KEN | KEN | KEN | KEN | ||
| Rama Twp | ONT | ONT | ONT | ONT | ONT | ONT | ONT | |
| Ramsay | NIP | |||||||
| Ramsay Twp | LNK | LNK | LNK | LNK | LNK | LNK | ||
| Ranken Village | REN | |||||||
| Rankine | NIP | |||||||
| Rat Portage Town | ALG | ALG | TBRR | |||||
| Rathburn | NIP | NIP | ||||||
| Ratter Twp | ALG | NIP | NIP | |||||
| Ravell | TBRR | |||||||
| Ravenna Village | GRY | |||||||
| Ravensworth Village | PSD | |||||||
| Rawdon Twp | HAS | HAS | HAS | HAS | HAS | HAS | ||
| Ray | NIP | |||||||
| Raymond | NIP | |||||||
| Rayside Twp | NIP | ALG | ||||||
| Reach Twp | ONT | ONT | ONT | ONT | ONT | ONT | ONT | |
| Red Rock Indian Reserve | TBRR | |||||||
| Redditt | TBRR | |||||||
| Redwing Village | GRY | |||||||
| Reef | ALG | |||||||
| Reformatory Prison | SIM | |||||||
| Regina Mine Twp | ALG | |||||||
| Renfrew Town | REN | REN | REN | REN | REN | REN | ||
| Riceville Village | PRE | |||||||
| Richards Twp | REN | REN | REN | REN | ||||
| Richardson Twp | TBRR | |||||||
| Richmond Hill Village | YOR | YOR | YOR | YOR | ||||
| Richmond Twp | LnA | LnA | LnA | LnA | LnA | LnA | LnA | |
| Richmond Village | CAR | CAR | CAR | CAR | CAR | CAR | CAR | |
| Richmond Village | ELG | |||||||
| Richwood Village | OXF | |||||||
| Ridgetown Town | KEN | ELG | ELG | KEN | ||||
| Ridgeway Town | WLD | |||||||
| Ridout | MUS | |||||||
| Ridout Twp | MUS | ONT | ONT | MUS | ||||
| Ridout Village | ALG | ALG | ||||||
| Ringwood Village | YOR | |||||||
| River Road | STO | |||||||
| Riverview Village | DUF | |||||||
| Robinson Twp | ALG | ALG | ALG | ALG | ||||
| Roblins Mills | PED | |||||||
| Rocher Capitaine | NIP | |||||||
| Rochester Twp | ESS | ESS | ESS | ESS | ESS | ESS | ESS | |
| Rockingham Village | REN | |||||||
| Rockland Village | RUS | RUS | RUS | |||||
| Rocklyn Village | GRY | |||||||
| Rockvillage | RUS | |||||||
| Rockwood Lunatic Asylum | FRO | |||||||
| Roddick Twp | TBRR | |||||||
| Rodney | ELG | |||||||
| Rolph Twp | REN | REN | REN | REN | REN | REN | ||
| Romney Twp | KEN | KEN | KEN | KEN | KEN | KEN | ||
| Root River | ALG | |||||||
| Rose | ALG | |||||||
| Roseberry Twp | ALG | TBRR | ||||||
| Rosemont Village | DUF | |||||||
| Roseneath Village | NUL | |||||||
| Roseville Village | WAT | |||||||
| Ross Lake | TBRR | |||||||
| Ross Twp | REN | REN | REN | REN | REN | REN | REN | REN |
| Rosseau Village | PSD | |||||||
| Rossport Village | ALG | TBRR | ||||||
| Rostock | PER | |||||||
| Ratho | OXF | |||||||
| Rothsay Village | WGT | |||||||
| Roxborough Twp | STO | STO | STO | STO | STO | STO | STO | |
| Rugby Twp | TBRR | |||||||
| Russell Twp | RUS | RUS | RUS | RUS | RUS | RUS | RUS | |
| Russell Village | RUS | |||||||
| Rutherford Twp | NIP | ALG | ||||||
| Rutherford Village | LAM | |||||||
| Ruthven Village | ESS | |||||||
| Rydal Bank Village | ALG | ALG | ||||||
| Ryde Twp | MUS | MUS | ONT | ONT | MUS | |||
| Ryerson | ALG | |||||||
| Ryerson Twp | MUS | MUS | MUS | PSD | ||||
| Ryerson's Island | MS |