Olszyny postal code
Village · łomżyński county (powiat) · Piątnica municipality (gmina) · podlaskie voivodeship
- code
- 1
- streets
- 4
The postal code for Olszyny is 18-421. The code covers 4 streets.
Postal code – Olszyny
Streets A–Z (4)
How to address a letter or parcel in Poland?
Jan Kowalski ul. Krótka 1 18-421 Olszyny
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 is the postal code for Olszyny?
The postal code for Olszyny is 18-421.
Which voivodeship and county is Olszyny in?
Olszyny (village) is in łomżyński county (powiat), Piątnica municipality (gmina), podlaskie voivodeship.
Are there other localities named Olszyny?
Yes – 10 localities share this name, including in these voivodeships: małopolskie, dolnośląskie, pomorskie, łódzkie, mazowieckie, warmińsko-mazurskie. Each has its own postal code.
Which localities are closest to Olszyny?
The closest localities to Olszyny are: Taraskowo (1.5 km), Wyłudzin (1.6 km), Olszyny-Kolonia (2.2 km), Nowe Bożejewo (2.2 km), Kałęczyn (2.3 km), Guty (3 km). Distances are measured in a straight line between locality centres.
Localities near Olszyny (łomżyński county)
Which county and municipality does Olszyny belong to?
Olszyny lies in Piątnica municipality (gmina), in łomżyński county (powiat), podlaskie voivodeship, Poland. Centre of the area based on address points: 53.2137, 22.2486.
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