MZ on a licence plate

MZ is an area code in 4 countries. The plate's style and country code tell them apart.

Austria
MZ 123AB
Bruck-Mürzzuschlag (Styria)
No longer issued
Code details →
Germany
MZ-AB 1234
Mainz (Rhineland-Palatinate), Mainz-Bingen (Rhineland-Palatinate)
Code details →
Greece
MZ-1234
Messenia
Code details →
United Kingdom
MZ51 ABC
Antrim (Northern Ireland), Down (Northern Ireland)
named after Belfast
Code details →