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:
Je vais à ParisI'm going to Paris
Il va au Havre.He's going to Le Havre
Elle est à New York.She is in New York.
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:
Il revient de LondresHe's coming back from London.
Je suis de La RochelleI'm from La Rochelle
On va à La Nouvelle-Orléans la semaine prochaine.We're going to New Orleans next week.
Mon oncle vient du Havre.My uncle comes from Le Havre.
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