Area and Population
The area of the municipality is 2,013.50 km2., which represents 1.09% of the state total and 0.10% of the national total. The most important settlements, besides the municipal seat, are Los Hoyos, Jecori, Ojo de Agua, Kilometro 5 and Teonadepa. The municipal population was 5,776 in the 2005 count, which shows a decrease from 2000 when the census counted 6,202 inhabitants.  The municipal seat had a population of 2809 in 2000. 
It is located at Nacozari de García in the north, Huásabas in the east, Moctezuma in the south, Aconchi in the southwest, Huépac and Banámichi in the west, and Arizpe in the northeast. It is connected to the state capital of Hermosillo by Mex 17. See map at ; at an elevation of 914 metros. Boundaries are with
Agriculture is modest with corn and beans grown for subsistence and grasses grown for cattle fodder. The cattle industry is more important with over 25,000 head counted in the 2000 census.  Calves are exported to the United States. Mining is carried out with over 100 workers involved in this activity.
Originally the territory was occupied by the Opata teguimes Indians. In 1643 the area was visited by the Italian priest Tomás Basilio, and in 1643 the Jesuit missionary Egidio Monteffio founded the settlement with the name of Nuestra Señora de la Asunción de Cumpas.
- Enciclopedia de los Municipios de Mexico
- Gobierno de Sonora
- Social Economic Profile of Cumpas (in Spanish)
- Cumpas, Ayuntamiento Digital (Official Website of Cumpas, Sonora)