GPN's four production sites are located in France, in the heart of the major cereal production areas.

• 2 main industrial sites : the Grandpuits plant in the Department of Seine-et-Marne (77) and the Grand-Quevilly plant in the Department of Seine-Maritime
• 1 shared industrial site : Gonfreville l'Orcher at Le Havre 
• 1 transformation / distribution site : La Rochelle (Gratecap Services)