: The first three digits, "156," designate the Kostroma Oblast region.

For verification of specific addresses within this code, you can use the Russian Post official search tool .

: The final three digits "980" typically represent the specific local post office or delivery point. Comparison with Other Systems

It is common for users to encounter similar numerical strings that serve different purposes globally:

: Uses a six-digit PIN (Postal Index Number), which has a similar format to the Russian system but different regional assignments.