| Enumerated Area | pre1851 | 1851 | 1861 | 1871 | 1881 | 1891 | 1901 | 1911 |
| Sabaskosing Bay | ALG | |||||||
| Sabine Twp | HAS | HAS | NIP | NIP | ||||
| Saint John | MID | |||||||
| Saint John | NIP | |||||||
| Saint Johns Village | WLD | |||||||
| Saintfield Village | ONT | |||||||
| Salford Village | OXF | |||||||
| Salter Twp | NIP | ALG | ||||||
| Saltfleet Twp | WTW | WTW | WTW | WTW | WTW | WTW | WTW | WTW |
| Saltford Village | HUR | |||||||
| Sandfield Twp | ALG | ALG | ALG | ALG | ||||
| Sandhurst Town Lots | LnA | |||||||
| Sandwich East Twp | ESS | ESS | ESS | ESS | ESS | ESS | ||
| Sandwich South Twp | ESS | ESS | ||||||
| Sandwich Town | ESS | ESS | ESS | ESS | ESS | ESS | ESS | |
| Sandwich Twp | ESS | |||||||
| Sandwich West Twp | ESS | ESS | ESS | ESS | ESS | ESS | ||
| Sanford Lake | ALG | TBRR | ||||||
| Sarawak Twp | GRY | GRY | GRY | GRY | GRY | GRY | ||
| Sarnia Indian Reserve | LAM | |||||||
| Sarnia Town | LAM | LAM | LAM | LAM | LAM | LAM | ||
| Sarnia Twp | LAM | LAM | LAM | LAM | LAM | LAM | ||
| Sarsfield Village | RUS | |||||||
| Saugeen Indian Reserve Twp | BRU | BRU | BRU | |||||
| Saugeen Twp | BRU | BRU | BRU | BRU | BRU | BRU | BRU | |
| Sault Ste Marie Town | ALG | ALG | ||||||
| Sault Ste Marie Twp | ALG | ALG | ALG | ALG | ALG | ALG | ||
| Savanne Agency | ALG | |||||||
| Savanne Twp | ALG | |||||||
| Savanne Village | ALG | |||||||
| Sawbill Lake Twp | ALG | |||||||
| Sawbill Mine | ALG | |||||||
| Scarborough Junction Village | YOR | |||||||
| Scarborough Twp | YOR | YOR | YOR | YOR | YOR | YOR | ||
| Scarf | ALG | |||||||
| Schrieber Twp | ALG | TBRR | ||||||
| Scoble Twp | TBRR | |||||||
| Scotland Village | BRA | |||||||
| Scott Twp | ONT | ONT | ONT | ONT | ONT | ONT | ONT | |
| Scotty Island | ALG | |||||||
| Scugog Twp | ONT | ONT | ONT | ONT | ONT | ONT | ONT | |
| Seaforth Town | HUR | HUR | HUR | HUR | HUR | |||
| Sebastopol Twp | REN | REN | REN | REN | REN | REN | ||
| Secord Twp | NIP | |||||||
| Section Camp | ALG | |||||||
| Seeleys Bay Village | LEE | |||||||
| Seguin Falls Village | PSD | |||||||
| Seine River Village | ALG | TBRR | ||||||
| Selby Village | LnA | |||||||
| Selkirk Village | HLD | |||||||
| Selwyn | PET | |||||||
| Seneca Twp | HLD | HLD | HLD | HLD | HLD | HLD | ||
| Serpent Reserve | ALG | |||||||
| Serpent River | NIP | |||||||
| Severn Bridge | MUS | |||||||
| Severn Bridge Village | SIM | |||||||
| Severn Post | ALG | |||||||
| Seymour Twp | NUL | NUL | NUL | NUL | NUL | NUL | NUL | NUL |
| Shakespeare | ALG | |||||||
| Shakespeare Village | PER | |||||||
| Sharpe | NIP | |||||||
| Shawanaga Indian Reserve | PSD | |||||||
| Shawanaga Twp | MUS | MUS | PSD | |||||
| Shedden Twp | NIP | ALG | ||||||
| Sheffield Twp | LnA | LnA | LnA | LnA | LnA | LnA | LnA | |
| Sheffield Village | WTW | |||||||
| Sheguiandah Twp | ALG | ALG | ALG | ALG | ||||
| Sheik's Island | STO | |||||||
| Shelburne Village | WGT | |||||||
| Shelburne Village | GRY | GRY | GRY | DUF | ||||
| Shenston Twp | ALG | TBRR | ||||||
| Sherborne Twp | PET | PET | VIC | VIC | VIC | |||
| Sherbrooke Forest Twp | HLD | |||||||
| Sherbrooke North Twp | LNK | LNK | LNK | LNK | LNK | LNK | LNK | |
| Sherbrooke South Twp | LNK | LNK | LNK | LNK | LNK | LNK | LNK | LNK |
| Sherbrooke Twp | HLD | HLD | HLD | HLD | HLD | HLD | HLD | |
| Sherwood Twp | REN | REN | REN | REN | ||||
| Shetland | LAM | |||||||
| Shoal Lake | TBRR | |||||||
| Shuniah Twp | ALG | |||||||
| Sidney Twp | HAS | HAS | HAS | HAS | HAS | HAS | HAS | |
| Sifton Twp | TBRR | |||||||
| Silver Creek Twp | ALG | |||||||
| Silver Island | TBRR | |||||||
| Silver Islet | ALG | |||||||
| Silver Mountain | ALG | |||||||
| Simcoe Town | NRF | NRF | NRF | NRF | NRF | NRF | NRF | |
| Sims | TBRR | |||||||
| Sinclair Twp | MUS | MUS | MUS | MUS | ||||
| Sinclairville | WTW | |||||||
| Six Nations Reserve | BRA | |||||||
| Smith Island | ALG | |||||||
| Smith Twp | PET | PET | PET | PET | PET | PET | PET | PET |
| Smiths Falls Town | LEE | LEE | ||||||
| Smiths Falls Town | LNK | LNK | LNK | LNK | LNK | |||
| Smithville | STO | |||||||
| Smithville Village | LIN | |||||||
| Smyth Town | NIP | |||||||
| Snake Island | WTW | |||||||
| Snake Island | YOR | YOR | ||||||
| Snider Twp | ALG | NIP | ALG | |||||
| Snowdon Twp | PET | PET | PET | VIC | VIC | VIC | ||
| Snyder Village | WLD | |||||||
| Sombra Twp | LAM | LAM | LAM | LAM | LAM | LAM | ||
| Somerville Twp | VIC | VIC | VIC | VIC | VIC | VIC | VIC | |
| Sonya Village | VIC | |||||||
| Sophiasburgh Twp | PED | PED | PED | PED | PED | PED | ||
| South Aboyne Village | WGT | |||||||
| South Algona | REN | |||||||
| South Bay | ALG | TBRR | ||||||
| South Bay Mouth Village | ALG | |||||||
| South Cayuga Village | HLD | |||||||
| South Crosby Twp | LEE | |||||||
| South Dorchester | MID | |||||||
| South Dumfries | BRA | |||||||
| South Fredericksburg | LnA | |||||||
| South Gower Twp | GVL | GVL | GVL | GVL | GVL | GVL | GVL | GVL |
| South Himsworth | PSD | |||||||
| South Indian Village | RUS | |||||||
| South Monaghan Village | DUR | |||||||
| South Napanee Village | LnA | |||||||
| South Porcupine | ALG | |||||||
| South River Village | PSD | |||||||
| Southampton Village | BRU | BRU | BRU | BRU | BRU | BRU | ||
| Southend Village | WLD | |||||||
| Southern Walkerton | BRU | |||||||
| Southwold Twp | ELG | ELG | ELG | ELG | ELG | ELG | ELG | ELG |
| Southworth Twp | TBRR |