| Deux-Montagnes | |
| Settlement Type: | Regional county municipality |
| Coordinates: | 45.4667°N -80°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | Region |
| Subdivision Name2: | Laurentides |
| Established Title: | Effective |
| Established Date: | January 1, 1983 |
| Seat Type: | County seat |
| Seat: | Saint-Eustache |
| Government Type: | Prefecture |
| Leader Title: | Prefect |
| Leader Name: | Marc Lauzon |
| Area Total Km2: | 294.10 |
| Area Land Km2: | 242.88 |
| Population Footnotes: | [1] |
| Population Total: | 102,052 |
| Population As Of: | 2021 |
| Population Density Km2: | 420.2 |
| Population Blank1 Title: | Change 2016-2021 |
| Population Blank1: | 3.9% |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 41,454 |
| Timezone: | EST |
| Utc Offset: | −5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −4 |
| Postal Code Type: | Postal code(s) |
| Area Code: | 450 and 579 |
Deux-Montagnes is a regional county municipality in the Laurentides region of Quebec, Canada. It is located immediately north of Laval on the north shore of the Rivière des Mille-Îles and on the north shore of the Lake of Two Mountains. Its seat and largest city is Saint-Eustache.
The municipality has a land area of 242.88 km2 and its population was 102,052 residents as of the 2021 Census.[1]
There are 7 subdivisions and one native reserve within the RCM:
| Canada Census Mother Tongue - Deux-Montagnes Regional County Municipality, Quebec[2] | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Census | Total | ||||||||||||||||||
| Year | Responses | Count | Trend | Pop % | Count | Trend | Pop % | Count | Trend | Pop % | Count | Trend | Pop % | ||||||
| 84,690 | 0.5% | 83.3% | 5,620 | 1.8% | 5.53% | 1,685 | 50.58% | 1.66% | 8.135 | 30.68% | 8% | ||||||||
| 85,125 | 1.3% | 86.9% | 5,520 | 6.5% | 5.6% | 1,090 | 20.4% | 1.1% | 6,225 | 63.4% | 6.4% | ||||||||
| 84,000 | 8.4% | 88.78% | 5,905 | 3.3% | 6.24% | 905 | 28.4% | 0.96% | 3,810 | 42.7% | 4.03% | ||||||||
| 77,480 | 6.3% | 89.50% | 5,715 | 1.9% | 6.60% | 705 | 9.0% | 0.81% | 2,670 | 72.8% | 3.08% | ||||||||
| 72,880 | 4.2% | 90.19% | 5,610 | 8.9% | 6.94% | 775 | 2.6% | 0.96% | 1,545 | 8.8% | 1.91% | ||||||||
| 69,945 | n/a | 89.35% | 6,160 | n/a | 7.87% | 755 | n/a | 0.96% | 1,420 | n/a | 1.81% | ||||||||
Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border:[3]