Łomża postal code
Town · Łomża county (powiat) · Łomża municipality (gmina) · podlaskie voivodeship
- code
- 1
- streets
- 275
The postal code for Łomża is 18-400. The code covers 275 streets.
Postal code – Łomża
Streets A–Z (275)
How to address a letter or parcel in Poland?
Jan Kowalski ul. 3 Maja 1 18-400 Łomża
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 Łomża?
The postal code for Łomża is 18-400.
Which voivodeship and county is Łomża in?
Łomża (town) is in Łomża county (powiat), Łomża municipality (gmina), podlaskie voivodeship.
Which localities are closest to Łomża?
The closest localities to Łomża are: Zawady (3.3 km), Piątnica Włościańska (3.3 km), Stara Łomża nad Rzeką (3.5 km), Piątnica Poduchowna (3.7 km), Stara Łomża przy Szosie (4 km), Stare Kupiski (4 km). Distances are measured in a straight line between locality centres.
Which county and municipality does Łomża belong to?
Łomża lies in Łomża municipality (gmina), in Łomża county (powiat), podlaskie voivodeship, Poland. Centre of the area based on address points: 53.1735, 22.0618.
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