Italy Postal Code Format Guide
Italian CAP postal codes contain five digits. Leading zeroes are significant, especially for Rome and other areas, so string storage is required.
Standard format
NNNNN
Example
00100
Implementation and validation notes
Italian CAP postal codes contain five digits. Leading zeroes are significant, especially for Rome and other areas, so string storage is required.
Validate required state, character set, length, and syntax on the client, then repeat validation on the server. Preserve the original input and normalize into a separate field; never truncate local scripts, compound names, or leading zeroes to fit a single Western assumption.
This guide describes common formats rather than an official registry and cannot enumerate every exception. Generated output is for testing only, not delivery, calling, identity verification, or real account activity.
Related resources
Frequently asked questions
What is the standard Italy postal code format?
A common representation is NNNNN, for example 00100. Italian CAP postal codes contain five digits. Leading zeroes are significant, especially for Rome and other areas, so string storage is required.
How should Italy postal code test data be stored?
Store the original value as a string so leading zeroes, spaces, hyphens, accents, and local scripts are preserved. Use a separate normalized field for search.
Does correct formatting prove the data is real?
No. Syntax validation cannot prove an address is deliverable, a number is assigned, or a name belongs to a real person.