Italian Municipality Cadastral Codes: Complete Guide

What are the cadastral codes of municipalities?

The cadastral codes of municipalities are four-character identifiers that Italy assigns to every town, city, and historic commune on its territory. People also call them Belfiore codes, after the street in Rome where the central registry office once sat. They sit at the heart of your codice fiscale (the Italian tax code), and getting one wrong quietly breaks the whole thing.

Here is why they matter so much. The four letters that encode your birthplace fill positions 12 to 15 of the sixteen-character tax code, and the final check character is calculated from everything before it. Change one digit of the cadastral code and the check letter changes too. So a single typo isn't a small typo — it invalidates the entire string.

The registry is large. The Italian Revenue Agency (Agenzia delle Entrate) maintains and periodically updates a list covering more than 8,000 municipalities, both currently active and long since dissolved. That historic depth is deliberate, and we'll come back to why it matters for anyone born decades ago.

How a cadastral code is built

Every code follows one tidy pattern. One letter, then three digits — four characters in total, no exceptions to the length.

• 1 letter (position 12): broadly tied to the province or geographic area
• 3 digits (positions 13-15): pin down the one specific municipality

A quick word of honesty here. People often assume the opening letter maps neatly onto a province, and most of the time the intuition is close enough to be useful. It is not a strict rule, though. Boundaries shifted over a century of assignments, so treat the letter as a hint, never a guarantee.

Want to see the rule in reverse? Take any valid Italian tax code, read characters twelve through fifteen, and you have isolated the cadastral code. Our reverse tax code lookup does exactly that decomposition for you, splitting a code back into birthplace, date, and gender.

How to find the code for your municipality

There's more than one route to the right four characters, and which one you reach for depends on what you already have in hand.

1. Use our calculator — type the municipality name and the matching code is filled in for you, no lookup tables needed
2. Read it off a birth certificate, which frequently prints the cadastral code outright
3. Check the Revenue Agency's official archive, the authoritative source when an edge case has you second-guessing
4. Ask the municipal registry office (the anagrafe) — slower, but they'll confirm it on request

For most people the first option settles it in seconds. If you already hold a tax code and want to confirm the birthplace baked into it, the tax code verification tool flags a mismatched or impossible cadastral code before it ever reaches a form.

Cadastral codes of the main Italian cities

Reading a real example beats any abstract rule. Below are the codes for Italy's most populous cities — Rome's H501 and Milan's F205 are probably the two you'll encounter most often.

Codes for people born abroad

If you were born outside Italy, the system still has a slot for you. Instead of a municipal code, you get a country code that always opens with Z and is followed by three digits. A few of the most common ones:

A practical note that trips people up. These country codes are not frozen — they can be retired or reassigned when borders move, a state dissolves, or a new country appears on the map. Someone born in a country that no longer exists keeps the code that was valid at the time of birth, which is the same principle that governs dissolved Italian towns. And that brings us to the suppressed municipalities.

Suppressed and merged municipalities

Italy's map of communes is not fixed. Towns merge, split, and disappear, and each change ripples through the cadastral registry. When a municipality is suppressed or merged into a neighbour, the records have to account for everyone who was ever born there.

• The original code stays valid for anyone born before the date of suppression — their tax code never changes
• The newly formed municipality receives its own fresh cadastral code going forward
• The Revenue Agency keeps the full historic archive, so retired codes remain resolvable for life

A concrete case makes it click. When a cluster of small comuni fuses into a single new town, a child born the day after the merger gets the new code, while their older sibling keeps the old one permanently. Two siblings, two birthplaces on paper, both completely correct. Genealogists and pension offices lean on this historic continuity constantly.

The founding rules for the tax code system, including these birthplace codes, trace back to Presidential Decree 605/1973 — the same legislation that introduced the codice fiscale itself.