Siemień Nadrzeczny postal code
Village · łomżyński county (powiat) · Łomża municipality (gmina) · podlaskie voivodeship
- code
- 1
- streets
- 13
The postal code for Siemień Nadrzeczny is 18-400. The code covers 13 streets.
Postal code – Siemień Nadrzeczny
Streets A–Z (13)
How to address a letter or parcel in Poland?
Jan Kowalski ul. Cicha 1 18-400 Siemień Nadrzeczny
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 Siemień Nadrzeczny?
The postal code for Siemień Nadrzeczny is 18-400.
Which voivodeship and county is Siemień Nadrzeczny in?
Siemień Nadrzeczny (village) is in łomżyński county (powiat), Łomża municipality (gmina), podlaskie voivodeship.
Which localities are closest to Siemień Nadrzeczny?
The closest localities to Siemień Nadrzeczny are: Siemień-Rowy (1.4 km), Rybno (2.4 km), Niewodowo (2.5 km), Zosin (2.6 km), Drozdowo (2.8 km), Rakowo-Czachy (2.9 km). Distances are measured in a straight line between locality centres.
Localities near Siemień Nadrzeczny (łomżyński county)
Which county and municipality does Siemień Nadrzeczny belong to?
Siemień Nadrzeczny lies in Łomża municipality (gmina), in łomżyński county (powiat), podlaskie voivodeship, Poland. Centre of the area based on address points: 53.1322, 22.1576.
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