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Seymen Postal Codes: 41245 | Başiskele, Kocaeli, Marmara

The Postal Codes (Posta kodları) for Seymen is 41245 in Başiskele, Kocaeli, Marmara, Başiskele, Turkey. The table below lists Postal Codes and postcodes for places within Seymen.

Postal Codes for Places in Seymen

Showing 4 places in Seymen. Last verified with official records on April 25, 2026.

Damlar mah.
Karşiyaka mah.
Körfez mah.
Seymen mah.

Sample Address Format for Seymen

Sender
[Sender Name]
[Sender Street Address]
[City, ZIP]
[Country]
Recipient
[Recipient Name]
Street Address / PO Box
Seymen, Başiskele, Kocaeli, Marmara, 41245
TURKEY

Seymen on the Map

The map above highlights the geographic boundaries of the Seymen towns in Turkey.

Seymen Quick Facts

CountryTurkey (TR)
Administrative PathTurkey → Marmara → Kocaeli → Başiskele
Postal Code41245
RegionsMarmara
ProvincesKocaeli
DistrictsBaşiskele
ISO CodesTR / TUR / 792
Top-level domain (ccTLD).tr
Coordinates40.710861, 29.902657
Places4

What to Know About Seymen

Key Facts

Seymen is a neighborhood (mahalle) within the Başiskele district of Kocaeli Province, located in the Marmara Region of northwestern Turkey. Situated in the eastern part of the Marmara Region, Seymen lies within the broader Kocaeli Peninsula area, which forms a crucial connection between Istanbul and Anatolia. The neighborhood is positioned near the Gulf of İzmit, an eastern extension of the Sea of Marmara, giving it strategic importance within the industrial and logistical corridor that characterizes much of Kocaeli Province. While specific population figures for Seymen are not widely published at the neighborhood level, Başiskele district as a whole has experienced significant growth in recent decades, with current estimates placing its population well over 100,000 residents. As a neighborhood, Seymen does not contain further administrative subdivisions but forms part of Başiskele's urban fabric alongside other neighborhoods. The area benefits from its proximity to major transportation routes, including the D-100 highway and railway connections that link it to both Istanbul and Anatolian cities. For those seeking detailed postal code information and local services within Seymen and its immediate surroundings, accurate addressing data is essential for efficient mail delivery and location-based services.

Neighboring Regions

  • Yeniköy
  • Bahçecik
  • Kullar
  • Yuvacık

Postal codes verified against the official PTT postal code database (ptt.gov.tr) · Page updated:

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