Condom is a commune (now don’t be naughty) in the Midi-Pyrénées mountains of France, and you can send a French letter to it because they speak the language. The name comes from Condate-ó-magos although we have no idea of what that entails. However, you will need a raincoat when visiting because it rains all year round.
The French word for a condom (the kind you are thinking of) is a préservatif. In 1995, the Condom Mayor opened a museum of “population control devices” but it closed ten years later. We doubt the Bishop of Condom had a say in the matter because they have not had one since 1801.