How do you say I live in London French?

There are a couple of ways to say "I live in London" in French, depending on the context:

Formal:

* J'habite à Londres. (This is the most common and straightforward way to say it.)

Informal:

* Je suis à Londres. (This literally translates to "I am in London," but it's often used to mean "I live in London" in informal settings.)

More specific:

* Je réside à Londres. (This is more formal and emphasizes the act of living there.)

Note: The preposition "à" is used before place names in French.