The shield of Sinaloa consists of an oval-shaped pitaya divided into four sections which each represent a city of the State. The upper dexter section represents Culiacán, the upper sinister section represents El Fuerte, the lower dexter section represents El Rosario and the lower sinister section represents Mazatlán. The pitaya also includes its characteristic thorns; human footprints which symbolize the pilgrimage of the people of Aztlan on its way to Tenochtitlan; and the text Sinaloa 1831.
The eagle on top of it resembles the shield used when Sinaloa and Sonora were a Estado de Occidente between 1821 and 1831.
Sinaloa flag - The flag features a tomato in the middle, as depicted on the states' car licence plates. Green and yellow are colors associated with sinaloa. Flag proposed by daviddelgadohh (2017).
Reddit competition entry. By Rotten Ali.
The Flag of Sinaloa is composed by the Gulf of California or Sea of Cortez, a big agricultural activity at the centre of the state's economy and a red oval in the middle as a graphic representation of its namesake. By Ricardo Vazoli, 2016.