- That every place has an address. Some countries like Mongolia don't. Many countries don't have reliable addresses.
- That addresses follow the "number street city" format. In Germany the street comes before the number
- That street names are unique within a city.
- That door numbers are contiguous and zig zag from one end of a street to another. In Germany they sometimes go in a loop, starting on one side, and returning on the other. Unless they don't.
- That streets are continuous. Mine wasn't and it confused delivery drivers. (Rue de la Volière, Granby, Canada