In the Russian postal system (Russian Post), six-digit codes are used to route mail efficiently. The first three digits ("156") represent the main sorting hub for the Kostroma region, while the final three digits ("966") designate the specific local office or internal department. When addressing mail to this code, ensure you include: The recipient's full name or department. The specific street address in Kostroma (if applicable). The city and region (Kostroma, Kostromskaya Oblast). The ZIP code: 156966 .

The ZIP code is associated with the Russian Post and is located in the Kostroma region (Kostromskaya Oblast) of Russia . Location & Context

: It typically identifies a specialized or technical postal facility, often used for processing or specific institutional mail rather than a general residential delivery area. Country : Russia. Postal Details

: This ZIP code is assigned to a specific postal service point within the city of Kostroma , the administrative center of the Kostroma Oblast.