Kosiorki postal code
Village · wysokomazowiecki county (powiat) · Ciechanowiec municipality (gmina) · podlaskie voivodeship
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The postal code for Kosiorki is 18-230.
Postal code – Kosiorki
How to address a letter or parcel in Poland?
Jan Kowalski Kosiorki 15 18-230 Kosiorki
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. There are no named streets in Kosiorki, so the second line contains the locality name and property number (e.g. Kosiorki 15). If the serving post office is in another locality, its name can appear next to the code on the last line.
Frequently asked questions
How do I address a letter to Kosiorki if it has no named streets?
Instead of a street, write the locality name and house number, e.g. “Kosiorki 15”. On the last line, write the postal code 18-230 and the locality or post office name.
What is the postal code for Kosiorki?
The postal code for Kosiorki is 18-230.
Which voivodeship and county is Kosiorki in?
Kosiorki (village) is in wysokomazowiecki county (powiat), Ciechanowiec municipality (gmina), podlaskie voivodeship.
Are there other localities named Kosiorki?
Yes – 2 localities share this name, including in these voivodeships: podlaskie. Each has its own postal code.
Which localities are closest to Kosiorki?
The closest localities to Kosiorki are: Przybyszyn (1.2 km), Gaj (1.3 km), Kostuszyn-Kolonia (1.8 km), Dąbczyn (2.2 km), Poniaty (2.7 km), Pełch (2.8 km). Distances are measured in a straight line between locality centres.
Localities near Kosiorki (wysokomazowiecki county)
Which county and municipality does Kosiorki belong to?
Kosiorki lies in Ciechanowiec municipality (gmina), in wysokomazowiecki county (powiat), podlaskie voivodeship, Poland. Centre of the area based on address points: 52.6257, 22.5212.
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