Roadmap of Sonora, Mexico
This detailed map was put out by the Secretaría de Comunicaciones y Transportes. To get full use out of this map you must download the PDF here (2.7 mb). It is a vector-based map, so will not get fuzzy when you zoom in.
According to the map the state of Sonora covers an area of 184,934 square kilometers and in 2008 had a population of 2,394,861.