Using Balkan JMBG ID Numbers in Investigations

The Balkan Unique Master Citizen Number (JMBG) is critical to any investigation in the former Yugoslavia. In addition to providing a unique identifier to an individual, it also provides key personally identifiable information (PII) about the subject.

What is the JMBG?

The Unique Master Citizen Number, or JMBG (Jedinstveni Matični Broj Građana), is a 13-digit code assigned at birth to all citizens of the former Yugoslav republics—Bosnia and Herzegovina, Croatia, Montenegro, North Macedonia, Serbia, and Slovenia.

The number has four sections, three of which contain PII about the owner. These include date of birth, region of birth or residency, and gender.

The JMBG is used in all facets of Balkan life—banking, healthcare, identification, travel, legal matters—similar to the Social Security Number in the United States. It is a permanent number and does not change.

Because the Balkan region features multiple languages, the JMBG goes by several different names:

Country Name
Bosnia and Herzegovina Jedinstveni matični broj građana
Croatia Jedinstveni matični broj građana
Montenegro Јединствени матични број грађана
North Macedonia Единствениот матичен број на граѓаните
Serbia Јединствени матични број грађана
Slovenia Enotna matična številka občana

How to Interpret the JMBG

First, let’s look at the structure of the JMBG. Its 13 digits break down like this:


(D = day; M = month; Y = year; R = region; G = gender; C = control)

The first seven digits of the number indicate the owner’s date of birth. It is important to remember that only the last three digits of the year appear (1980 becomes “980,” for example).

The next two digits contain geographic information. Because the JMBG was introduced for all Yugoslav citizens on Jan. 8, 1977, interpreting this depends on the owner’s date of birth. For citizens born before this date, these two digits indicate their region of residence at the time the number was issued. However, for citizens born on or after this date, they indicate place of birth.

In some cases, a JMBG can be issued to non-citizens, such as non-citizen permanent residents. This is denoted with a number indicating non-citizen status and the region where the JMBG was issued.

The next three digits indicate the owner’s gender. If the three digit value falls within the range 000-499, the individual is male. If it falls within the range 500-999, the individual is female. The ranges allow for unique numbers among people born on the same day in the same region.

Lastly, the final digit in the sequence is a control number, or checksum, calculated from the other values. This is used to check the number for errors. This number does not contain any personally identifiable information.

Example: Naser Kelmendi

For an example, we can look at the case of Naser Kelmendi, a Balkan crime boss sanctioned in 2012 by the U.S. Department of the Treasury for narcotics trafficking. The Treasury notice lists Kelmendi’s JMBG, 1502957172694, in addition to several other identifying pieces of information.

Let’s apply what we know about the JMBG’s breakdown to Kelmendi’s number:

– The first seven digits indicate that he was born on Feb. 15, 1957 (1502957).

– Because he was born before 1976, the number 17 indicates that his place of residence at the time the JMBG was issued was Sarajevo, Bosnia and Herzegovina. (Note: had he been born after 1976, this number would indicate Sarajevo as his place of birth.)

– Finally, 269 is less than 499, so we can confirm that he is male.

Where Can You Find the JMBG?

The public availability of the JMBG throughout the Balkans varies from country to country.

Since the breakup of Yugoslavia in the 1990s, many of the former republics have raised concerns about privacy and whether or not the number should be publicly available. Some, such as Bosnia and Herzegovina, have restricted access to it, redacting it from public documents and government records disclosures.

Croatia moved in 2009 to replace the JMBG with a randomized Personal Identification Number (Osobni Identifikacijski Broj or OIB). However, this replacement is far from complete, and many institutions still require the JMBG for basic functions.

However, other states continue to make the JMBG easily available. For example, Serbia’s business registry allows users to view the full JMBGs of shareholders and directors, and Montenegro’s land registry (available on the Sayari Graph platform) offers a search-by-JMBG option.

JMBG: A Valuable Tool

Despite the differences in public availability, all the former republics continue to issue, use, and accept the JMBG as a valid ID number. As long as this is the case, it will continue to be a valuable resource for investigators seeking to confirm the subjects of their queries and locate their additional involvements throughout the Balkans.

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