On 30 March 1922, a part of the territory of Montigny-lès-Cormeilles was detached and merged with a part of the territory of Taverny and a part of the territory of Pierrelaye to create the commune of Beauchamp.
Population
Historical population
Year
Pop.
±% p.a.
1793
280
—
1800
369
+4.02%
1806
347
−1.02%
1821
376
+0.54%
1831
464
+2.13%
1836
581
+4.60%
1841
472
−4.07%
1846
487
+0.63%
1851
538
+2.01%
1856
505
−1.26%
1861
526
+0.82%
1866
581
+2.01%
1872
577
−0.12%
1876
682
+4.27%
1881
781
+2.75%
1886
806
+0.63%
1891
705
−2.64%
1896
811
+2.84%
Year
Pop.
±% p.a.
1901
791
−0.50%
1906
858
+1.64%
1911
1,059
+4.30%
1921
1,456
+3.23%
1926
2,201
+8.62%
1931
2,852
+5.32%
1936
3,180
+2.20%
1946
3,166
−0.04%
1954
4,158
+3.47%
1962
5,555
+3.69%
1968
7,022
+3.98%
1975
8,288
+2.40%
1982
13,644
+7.38%
1990
17,012
+2.80%
1999
17,183
+0.11%
2007
18,526
+0.95%
2012
20,018
+1.56%
2017
21,601
+1.53%
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Montigny-lès-Cormeilles is also served by La Frette–Montigny station on the Transilien Paris-Saint-Lazare suburban rail line. This station, although administratively located on the territory of the neighboring commune of La Frette-sur-Seine, lies in fact very near the town center of Montigny-lès-Cormeilles.