Guyancourt's 2026 population is now estimated at 30,058.In 2006, the population of Guyancourt was 28,219.Guyancourt has grown by 94 in the last year, which represents a 0.31% annual change.These population values and projections come from INSEE historical municipal populations (PMUN) by commune and World Population Review Internal Projections.
City | 2026 Pop.↓ | Growth |
|---|---|---|
| Paris | 2,059,821 | -0.7% |
| Marseille | 895,713 | 0.36% |
| Toulouse | 532,795 | 1.15% |
| Lyon | 518,778 | -0.02% |
| Nice | 368,553 | 1% |
| Nantes | 335,634 | 0.8% |
| Montpellier | 322,791 | 1.33% |
| Strasbourg | 299,009 | 0.59% |
| Bordeaux | 274,160 | 0.76% |
| Lille | 241,634 | 0.47% |
| Rennes | 239,012 | 1.16% |
| Toulon | 180,989 | 0.35% |
| Reims | 175,005 | -0.5% |
| Saint-Etienne | 172,718 | -0.08% |
| Villeurbanne | 172,606 | 1.79% |
| Le Havre | 164,954 | -0.35% |
| Dijon | 164,547 | 0.56% |
| Angers | 161,563 | 0.53% |
| Saint-Denis | 158,641 | 0.64% |
| Grenoble | 154,974 | -0.25% |
