Postal code
ul. Ernesta Kościńskiego, Olsztyn
Olsztyn, Olsztyn municipality (gmina), Olsztyn county (powiat), warmińsko-mazurskie voivodeship
ul. Ernesta Kościńskiego in Olsztyn has 2 postal codes: 10-583, 10-584. The correct code depends on the building number — check the table below. This street has 12 buildings with a listed postal code; 1 other street in this locality also uses 10-583. The locality is in Olsztyn county (powiat), warmińsko-mazurskie voivodeship.
| Code | Building numbers |
|---|---|
| 3, 5, 7, 9, 11 | |
| 2, 4, 6, 8, 10, 12, 14 |
How to address a letter or parcel in Poland?
Jan Kowalski ul. Ernesta Kościńskiego 3 10-583 Olsztyn
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. The postal code on this street depends on the building number. Before posting, make sure it matches the number in the table.
Frequently asked questions
What is the postal code for ul. Ernesta Kościńskiego, Olsztyn?
ul. Ernesta Kościńskiego (Olsztyn) has 2 postal codes: 10-583, 10-584.
What determines the postal code for ul. Ernesta Kościńskiego?
On longer streets, Polish Post assigns different postal codes to ranges of building numbers, often separately for even and odd numbers. The code for ul. Ernesta Kościńskiego therefore depends on the building number — see the ranges in the table above.
Which post office serves this address?
The main post office in this locality is UP Olsztyn 1, ul. Pieniężnego 21. Mail may also be delivered by another, closer branch — check the post office map.
Which other streets use postal code 10-583?
Where else can you find ul. Ernesta Kościńskiego?
All localities with ul. Ernesta Kościńskiego →Which postal codes are near 10-583?
Where is ul. Ernesta Kościńskiego, Olsztyn?
ul. Ernesta Kościńskiego, Olsztyn, lies in Olsztyn municipality (gmina), in Olsztyn county (powiat), warmińsko-mazurskie voivodeship, Poland. Centre of the area based on address points: 53.7765, 20.4912.
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