Is Paris a Megacity? Understanding the Definition

Yes, Paris is a megacity. The United Nations defines a megacity as an urban agglomeration with over 10 million inhabitants. The Paris metropolitan area (aire urbaine) had a population of ~12.5–13 million in recent estimates, comfortably exceeding the threshold.

Why Confusion Exists

• City proper (commune de Paris): Only ~2.1 million (small administrative area).
• Urban unit (unité urbaine): ~10.8 million (continuously built-up area).
• Metro area (aire urbaine): ~12.5–13 million (includes commuter belt).

Some sources mistakenly cite only the city-proper figure. By the standard international definition (metro area), Paris ranks among the world's megacities—typically top 20–25 globally.