Etchojoa is both a municipality and the name of the town that acts as the seat of that municipality. Founded in 1613, Etchojoa is located in the southwest of the Mexican state of Sonora. It is situated at . The total municipal area is 1,220.23 km². Etchojoa had a population of 56,129 in 2000, according to the official census. Neighboring municipalities are Navojoa, Huatabampo and Cajeme.
Etchojoa has a large indigenous population made up of the Mayo Indians, almost 20% of the population in 2000. The municipality sits in the Valle Mayo (Mayo Valley), named for the Río Mayo, a vital source for irrigation.
The economy is based primarily on agriculture, with over 800 km² irrigated throughout the municipality in 2000. Fifty percent of the land is part of the ejido system. Wheat, soy, corn, and citrus fruit are the most important crops.
- Etchojoa, Ayuntamiento Digital (Official Website of Etchojoa, Sonora)