Everything you need to know about the MG abbreviation and where it shows up
The abbreviation for Minas Gerais is MG. That's the short answer. It's used on vehicle license plates, postal addresses, government documents, and basically everywhere else that requires a two-letter state code in Brazil. But there are enough edge cases and quirks that people still get tripped up, so let me walk through the practical details.
sigla de minas geral
The Mercosul plate format, established by CONTRAN Resolution 210 in 2007, standardized the state codes across Brazil. MG sits in the third position of the plate — the format is LLE-9MML, where the final two characters are the state abbreviation. Before that resolution, the old Mercosul variation used the state name spelled out below the plate, which caused confusion because people would photograph plates and not know how to read them. I spent a lot of time dealing with vehicle registration data entry for a logistics company, and one specific problem kept coming up: some older plate readers and OCR systems would misread the "G" in MG as a "C" or "6". This happened especially with faded plates from heavy-use commercial vehicles. The workaround was to cross-reference the RENAVAM number against the DETRAN-MG database rather than relying purely on visual plate recognition. Takes about thirty seconds extra per vehicle, but it eliminated roughly 95% of the address mismatches we were seeing.
On postal addresses, the format is straightforward: city name, then ", MG" before the CEP. The Correios system recognizes this instantly. However, there's a common mistake where people write "MINAS GERAIS" in full on online forms that have a two-character dropdown for state selection. Those forms will reject the input. Always select "MG" from the list, never type the full name into a coded field. For official documents and legal correspondence, the abbreviation follows the same pattern. The Instrução Normativa from the Fazenda Nacional uses "MG" consistently. If you're dealing with processos administrativos or notas fiscais, the "UF" field on the NF-e always expects the two-letter code. Putting anything else causes theNota to be rejected by the SEFAZ parser.
One thing people don't always realize: the MG abbreviation is also used in geographic information systems, GPS coordinates, and mapping APIs. Google Maps, OpenStreetMap, and the IBGE all use "MG" as the canonical state identifier. If you're building any kind of address validation tool, hardcoding "MG" as the state code for anything within the Minas Gerais boundaries is the correct approach. No exceptions unless you're dealing with territories that have special status, which is extremely rare. The main pitfall I see repeatedly is when bilingual or international forms ask for the "state/province" and the person writing it puts "Minas Gerais" instead of "MG". The system treats it as invalid because it expects the ISO 3166-2:BR subcode, which is BR-MG. If you're working with international shipping or customs documentation, make sure you use the BR-MG format, not the full state name.
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There's also a minor issue with automated address parsing tools. Some of the older libraries, particularly ones trained on US address formats, will split "MG" as a street direction (like "Main Street, MG") rather than recognizing it as a state code. This causes address correction failures that can delay mail by several days. The fix is usually to add a custom state-code dictionary to the parser, but if you're using an off-the-shelf solution without that customization, expect occasional misreads on addresses that contain MG.
Quick reference: common uses of the MG abbreviation
License plates: standard position, three letters plus MG. Commercial vehicles follow the same format as passenger vehicles since the 2016 Mercosul transition was fully implemented. Postal addresses: always appears after the city name, separated by a comma. CEP validation recognizes it automatically.
Tax documents: NF-e, NFC-e, and CT-e all require MG in the UF field. The SEFAZ-MG portal processes these without issues when the code is correct. Digital forms and databases: any field labeled "UF" or "Estado" should receive "MG" as input. Full name entries will be rejected by properly configured systems.
International formats: ISO 3166-2 code is BR-MG. Use this for shipping labels, customs declarations, and any cross-border documentation. If you're building something that handles Minas Gerais addresses at scale, the biggest time sink isn't the abbreviation itself — it's cleaning up the data that comes in from sources that don't enforce the two-letter standard. Budget time for that normalization step, especially if you're importing from e-commerce platforms or legacy systems that store state names as free text.
