Postal code 10-345 – Olsztyn
Olsztyn, Olsztyn municipality, Olsztyn county, warmińsko-mazurskie voivodeship
- locality
- 1
- street
- 1
- buildings
- 9
Postal code 10-345 is used in Olsztyn (Olsztyn municipality, Olsztyn county, warmińsko-mazurskie voivodeship). It covers 9 buildings on 1 street – the full list with house numbers is below.
Which streets have postal code 10-345?
How to address a letter or parcel in Poland?
Jan Kowalski ul. Mieczysława Niedziałkowskiego 1 10-345 Olsztyn
Write the postal code in the 00-000 format on the last line, before the town name. Put the recipient's full name on the first line and the street with building and flat number on the second. For mail from abroad, add POLAND as the final line.
Frequently asked questions
What address does postal code 10-345 cover?
Postal code 10-345 covers Olsztyn, including streets: Mieczysława Niedziałkowskiego (Olsztyn county, warmińsko-mazurskie voivodeship).
Where is postal code 10-345?
In warmińsko-mazurskie voivodeship, Olsztyn county, Poland.
Is postal code 10-345 enough to send a parcel?
No – always write the postal code together with the town or post office name and the full address (street and building number, or the village name with the house number).
Which postal codes are next to 10-345?
Which municipality and county does 10-345 belong to?
The 10-345 area (Olsztyn) lies in Olsztyn municipality (gmina), in Olsztyn county (powiat), warmińsko-mazurskie voivodeship, Poland. Centre of the area based on address points: 53.7865, 20.4899.
Where does this data come from?
Localities and postal codes come from the public TERYT registers (Statistics Poland), while streets, building numbers and locations come from the National Register of Boundaries (GUGiK). Data as of 12.11.2026. This site is not affiliated with Poczta Polska; for important shipments, confirm the code at a post office. More about sources