[3] Eure-et-Loir is one of the original 83 departments created during the French Revolution on March 4, 1790 pursuant to the Act of December 22, 1789.

The current department corresponds to the central part of the land of the Carnutes who had their capital at Autricum (Chartres).

Nearly 40% of all farmland is devoted to the cultivation of wheat, which has generated an average of 29% of the commercial agricultural production of the department over the last 5 years.

Already ranked second nationally in terms of power generation through its wind farms located in particular in the Beauce region of Eure-et-Loir in 2012 will be the largest producer of electricity with photovoltaic French original creation on the airbase NATO disused Crucey-Villages near Brezolles in the region's natural Thymerais, the largest photovoltaic park in France.

Given in February 2011 by the General Council to the operator, EDF Energies Nouvelles, the park will cover 245 ha of the military base and produce the equivalent output of 160 wind turbines.