INEGI is Mexico's autonomous agency for statistics and geography. It maintains the country's geostatistical framework (Marco Geoestadístico), topographic mapping, land use and vegetation data, road networks, and the geography underpinning the national census and economic surveys.
INEGI is the definitive source for Mexican administrative and statistical boundaries, and its data is freely available for reuse with attribution. It is the natural starting point for any GIS project covering Mexico.