Chartres is the prefecture of the Eure-et-Loir department in the Centre-Val de Loire region in France. It is located about 90 km (56 mi) southwest of Paris. At the 2019 census, there were 170,763 inhabitants in the metropolitan area of Chartres, 38,534 of whom lived in the city (commune) of Chartres proper.

Eure-et-Loir is a French department, named after the Eure and Loir rivers. It is located in the region of Centre-Val de Loire. In 2019, Eure-et-Loir had a population of 431,575.