Legally, the coat of arms should occupy one third of the height and width in the same 4-to-7 ratio.

However, in reality it does not, as it is taller than it is wide; it is either set large at one third the width or small at one third the height.

The first flag was flown on March 16, 1841, when it was hoisted on the Ayuntamiento municipal building in the "Plaza Grande" of Mérida, the capital city of the state of Yucatán as the Republic of Yucatán.

This action was a protest against the centralism of Mexican president Antonio López de Santa Anna.

[2][3] The first flag of the state of Quintana Roo was officially adopted on January 1, 2016, it is a white banner with the entity's coat of arms.