Home posta kodu Turkey
Turkey Posta Kodu validator
How the posta kodu format works
- Format
- 5 digits
- Example
- 34000
Things to watch for
- Format-only check — does not confirm the posta kodu actually exists
- Always exactly 5 digits with no separators
- The first two digits match the province's vehicle-plate code — 34 for Istanbul
^[0-9]{5}$A Turkish posta kodu is the 5-digit postcode PTT (Posta ve Telgraf Teşkilatı) uses to route mail — for example 34000 for an Istanbul address. The first two digits are one of the more memorable design choices in this comparison: they reuse Turkey’s existing province plate-code numbering, the same two digits already printed on every vehicle registered in that province, so 34 means Istanbul and 06 means Ankara on both a car’s plate and a piece of mail. Anyone validating a Turkish shipping address, a checkout form, or a spreadsheet of customer records needs the posta kodu in the correct 5-digit shape before it’s trusted.
Because it’s a bare run of digits with no separator, a transposed pair of leading digits can silently route an address to a genuinely different, equally real province.
How this validator works
This tool checks that the input is exactly 5 digits with no letters, spaces, or hyphens, entirely in your browser, with nothing sent to a server.
What a pass doesn’t tell you
A posta kodu carries no check digit, so matching the 5-digit shape is the most a client-side tool can confirm — not that PTT has assigned it to a real district. Confirming that requires PTT’s own postcode lookup.
Scope: this page and tool cover format validation only — not address lookup or confirming a posta kodu is currently in use.
posta kodu FAQ
What do the first two digits of a Turkish posta kodu mean?
They match the province's vehicle-plate code — the same two-digit number Turkey has used on car number plates since the 1960s. Istanbul is plate code 34, so every Istanbul posta kodu starts with 34; Ankara is 06, and so on for all 81 provinces.
What does posta kodu mean?
It's Turkish for 'postal code' — a 5-digit code written directly before or as part of the address, e.g. 34000 for an Istanbul address.
Does a correctly formatted posta kodu mean it actually exists?
No. This tool only confirms the string is 5 digits — it doesn't check it against PTT's actual assignment list. Confirming a posta kodu is real, and seeing which district it names, requires PTT's own postcode lookup.