Sienno postal code
Town · lipski county (powiat) · Sienno municipality (gmina) · mazowieckie voivodeship
- code
- 1
- streets
- 16
The postal code for Sienno is 27-350. The code covers 16 streets.
Postal code – Sienno
Streets A–Z (16)
How to address a letter or parcel in Poland?
Jan Kowalski ul. Adama Cieśli 1 27-350 Sienno
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 Sienno?
The postal code for Sienno is 27-350.
Which voivodeship and county is Sienno in?
Sienno (town) is in lipski county (powiat), Sienno municipality (gmina), mazowieckie voivodeship.
Are there other localities named Sienno?
Yes – 6 localities share this name, including in these voivodeships: kujawsko-pomorskie, wielkopolskie, lubuskie, zachodniopomorskie. Each has its own postal code.
Which localities are closest to Sienno?
The closest localities to Sienno are: Stara Wieś (1.3 km), Trzemcha Dolna (1.6 km), Praga Górna (1.8 km), Wodąca (2.1 km), Praga Dolna (2.4 km), Grechów (2.5 km). Distances are measured in a straight line between locality centres.
Localities near Sienno (lipski county)
Which county and municipality does Sienno belong to?
Sienno lies in Sienno municipality (gmina), in lipski county (powiat), mazowieckie voivodeship, Poland. Centre of the area based on address points: 51.0876, 21.4759.
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