Addresses around the world
Common Address Mistakes and How to Avoid Them
Missing units, swapped lines, wrong postal codes and typos cause most failed deliveries. Learn the common address mistakes and simple fixes.
Updated 14 October 2026 · 2 min read
Most delivery failures are not mysterious. They come from a handful of repeated mistakes, nearly all of which are easy to prevent.
Missing details
- No unit or floor: the building is found but the recipient is not.
- No locality: a street name that exists in two districts becomes ambiguous.
- No phone number: the courier cannot ask for help.
Typos and character errors
- Swapped or dropped letters in street names.
- Digits transposed in building numbers or postal codes.
- The letter O typed in place of zero, or I in place of one.
- Wrong accent or missing diacritic.
Wrong order or placement
- Reversing building number and street in a region where the order matters.
- Putting the postal code on the wrong line.
- Writing the city after the country.
See small-to-large vs large-to-small address order.
Postal code problems
- Using an old or neighbouring code.
- Dropping letters, spaces or leading zeros.
- Writing a code that does not match the town.
Abbreviation and naming problems
- Unclear abbreviations that stand for different things.
- Mixing an old and a new street name.
- Writing a business name where the street should be.
Language and script problems
- Writing a foreign address in your own language instead of the destination's.
- Mixing scripts within one line.
- Inconsistent spelling of the same place.
These are covered in transliteration in addresses and mixed scripts in addresses.
A quick checklist
- Copy the address from the recipient's own message, not from memory.
- Check each line's order against the destination's convention.
- Make sure the postal code matches the town.
- Include the unit, floor or entrance.
- Add a phone number.
- Put the country on its own last line.
When the address itself is weak
Some addresses are ambiguous no matter how carefully they are written. In that case an exact-location code or map pin attached to the address helps, as in exact-location codes for ambiguous addresses.
Summary
Careful copying, correct order and complete detail prevent most address mistakes. A short checklist before posting saves time and cost.
Frequently asked questions
What is the most common address mistake?
Missing or wrong secondary details, such as the apartment, unit or floor, together with typos in the street name or postal code, are among the most frequent causes of delivery trouble.
How can I check an address before shipping?
Read it aloud against the recipient's own written version, check the code matches the town, and confirm the unit and phone number.