| Longaulnay | |
|---|---|
|   The town hall of Longaulnay | |
| Coordinates: 48°18′39″N1°56′18″W / 48.3108°N 1.9383°W | |
| Country | France | 
| Region | Brittany | 
| Department | Ille-et-Vilaine | 
| Arrondissement | Saint-Malo | 
| Canton | Combourg | 
| Intercommunality | Bretagne Romantique | 
| Government | |
| • Mayor (2020–2026) | David Buisset [1] | 
| Area 1 | 7.52 km2 (2.90 sq mi) | 
| Population  (2021) [2]  | 604 | 
| • Density | 80/km2 (210/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code |  35156 /35190 | 
| Elevation | 65–191 m (213–627 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Longaulnay (Breton : Hirwerneg) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.
Inhabitants of Longaulnay are called in French longaulnéens.
| Year | Pop. | ±% | 
|---|---|---|
| 1962 | 371 | — | 
| 1968 | 413 | +11.3% | 
| 1975 | 363 | −12.1% | 
| 1982 | 327 | −9.9% | 
| 1990 | 303 | −7.3% | 
| 1999 | 340 | +12.2% | 
| 2008 | 614 | +80.6% | 

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