| Saint-Sébastien | |
| Settlement Type: | Municipality |
| Pushpin Map: | Canada Southern Quebec |
| Pushpin Map Caption: | Location in southern Quebec |
| Coordinates: | 45.1167°N -82°W |
| Subdivision Type: | Country |
| Subdivision Name: | Canada |
| Subdivision Type1: | Province |
| Subdivision Name1: | Quebec |
| Subdivision Type2: | Region |
| Subdivision Name2: | Montérégie |
| Subdivision Type3: | RCM |
| Subdivision Name3: | Le Haut-Richelieu |
| Established Title1: | Constituted |
| Established Date1: | February 17, 1865 |
| Government Footnotes: | [1] [2] |
| Leader Title: | Mayor |
| Leader Name: | Martin Thibert |
| Leader Title1: | Federal riding |
| Leader Name1: | Brome—Missisquoi |
| Leader Title2: | Prov. riding |
| Leader Name2: | Iberville |
| Area Footnotes: | [3] |
| Area Total Km2: | 64.00 |
| Area Land Km2: | 63.29 |
| Population Footnotes: | [4] |
| Population Total: | 692 |
| Population As Of: | 2021 |
| Population Density Km2: | 10.9 |
| Population Blank1 Title: | Pop 2016-2021 |
| Population Blank1: | 3.6% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 284 |
| Timezone: | EST |
| Utc Offset: | −5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −4 |
| Postal Code Type: | Postal code(s) |
| Postal Code: | J0J 2C0 |
| Area Code: | 450 and 579 |
| Blank Name: | Highways |
| Blank Info: | |
Saint-Sébastien is a municipality in Le Haut-Richelieu Regional County Municipality in the Montérégie region of Quebec, Canada. The population as of the Canada 2021 Census was 692.
| Canada Census Mother Tongue - Saint-Sébastien, Montérégie, Quebec | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census | Total | ||||||||||||||||||
| Year | Responses | Count | Trend | Pop % | Count | Trend | Pop % | Count | Trend | Pop % | Count | Trend | Pop % | ||||||
| 655 | 22.43% | 90.97% | 20 | 33.3% | 2.78% | 5 | 66.7% | 0.69% | 40 | 57.9% | 5.56% | ||||||||
| 535 | 10.8% | 81.06% | 15 | 72.7% | 2.27% | 15 | n/a% | 2.27% | 95 | 35.7% | 14.39% | ||||||||
| 600 | 16.1% | 82.76% | 55 | n/a% | 7.59% | 0 | 0.0% | 0.00% | 70 | 133.3% | 9.65% | ||||||||
| 715 | n/a | 95.97% | 0 | n/a | 0.00% | 0 | n/a | 0.00% | 30 | n/a | 4.03% | ||||||||