01xx (where xx varies by district)
Tbilisi does not have a single postal code for the entire city. Instead, each district (and often specific neighborhoods or streets) has its own code. tbilisi postcode
If you need a code for a specific address (e.g., Rustaveli Avenue, Freedom Square), please provide the street or landmark and I can give a more precise number. 01xx (where xx varies by district) Tbilisi does