In French, you can use the preposition "à" or "de" with cities. However, there is a difference.
How to use 'à' or 'de' with cities in French
Look at these sentences using à and de:
Note that you use à when describing going to or being in a city.
And you use de to indicate being, coming or returning from a city.
With city names containing a definite article (e.g. La Rochelle / Le Havre), you will use à La or de La for feminine nouns, and the contracted forms au or du for masculine nouns:
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