Most Mexican states do not have an official flag. For these states, a de facto flag is used for civil and state purposes. State flags of Mexico have a 4:7 ratio and typically consist of a white background charged with the state's coat of arms.[1]
Unofficial flag of Chihuahua, a civil flag used by students and people in Chihuahua City. It was created by Daniel Martínez Miranda in 2009.[29]
A black and white variant of the Mexico City flag, with other variants existing. It is used more often than the standard color Mexico City coat of arms on a white field.
Flag of Coahuila y Tejas since 1836, proposed by governor of Coahuila, Manolo Jiménez, as the state flag of Coahuila.[30][31]
Veracruz de Ignacio de la Llave, it is just like the standard coat of arms in a white field flag, but with green and red corners. This is the official flag of the state's government, but an unofficial flag of the state itself.[34]
^"LEY SOBRE EL ESCUDO DEL ESTADO DE COAHUILA Y EL HIMNO COAHUILENSE"(PDF). www.coahuilatransparente.gob.mx (in Spanish). Gobierno de Coahuila de Zaragoza. Retrieved December 27, 2013. The article specifies that the flag shall consist of the coat of arms on a white background, and gives further physical specifications. Chapter 1 (Article 7) gives rules regarding the use of the coat of arms when it is in the form of a flag (en su modalidad de Bandera).
^"Ley sobre el Escudo del Estado de Oaxaca"(PDF). docs64.congresooaxaca.gob.mx (in Spanish). Gobierno de Oaxaca. Retrieved March 12, 2020. The article specifies that the flag shall consist of the coat of arms on a white background, and gives further physical specifications. Chapter 3 (Article 21) gives rules regarding the use of the coat of arms when it is in the form of a flag (en su modalidad de Bandera).
^"Ley sobre el Escudo y el Himno de Tabasco". tabasco.gob.mx (in Spanish). Gobierno de Tabasco. Retrieved February 19, 2020. The article specifies that the flag shall consist of the coat of arms on a white background, and gives further physical specifications. Chapter 3 (Article 11) gives rules regarding the use of the coat of arms when it is in the form of a flag (en su modalidad de Bandera).
^"Ley sobre el Escudo y el Himno de Tamaulipas"(PDF). tamaulipas.gob.mx (in Spanish). Gobierno de Tamaulipas. Retrieved December 15, 2011. The law does not explicitly declare a state flag. Instead, Article 3 states that the state's coat of arms can be represented in the form of a flag (puede representarse en forma de Bandera) and gives rules on how the coat of arms shall appear when used in that form. The article specifies that the flag shall consist of the coat of arms on a white background, and gives further physical specifications. Chapter 4 (Articles 7 through 18) gives rules regarding the use of the coat of arms when it is in the form of a flag (en su modalidad de Bandera).