The county of the Vexin was a medieval French county that was later partitioned between the Vexin Français (French Vexin) and the Vexin Normand (Norman Vexin).

Carolingian counts

• 753–764 Romuald, survivor of the Battle of Poitiers (732)
• in 790 Griffon
• 796 Riferus
• (date unknown) Regnauld
• about 851–864 Geilenus, count of Meulan

Nibelungs

• 864-after 879 Nibelung IV
• Theodoric I, his son
• 886 Adelram III and Theodoric II, defenders of Pontoise, nephews of Theodoric I

House of Valois-Vexin-Amiens

• about 895-919 Ermenfroi, also count of Amiens and Valois
• 915-926 Ralph I d'Ostrevent, also count of Amiens and Valois
• 926-943 Ralph II, also count of Amiens and Valois, son of preceding
• 943-after 992 Walter I, also count of Amiens and Valois, apparently brother of preceding
• about 998-after 1017 Walter II the White, also count of Amiens and Valois, son of preceding
• about 1024-1035 Drogo, also count of Amiens, son of preceding
• 1035-1063 Walter III, also count of Amiens, Valois and Maine, son of preceding
• 1063-1074 Ralph IV, also count of Valois and Amiens, son of Ralph III of Valois and grandson of Walter II
• 1074-1077 Simon, also count of Valois and Amiens, he became a monk and his properties were dispersed, Vexin being partitioned between the Duke of Normandy and the King of France

• 1092-1108 Louis of France, son of king Philip I of France, made count of Vexin Français, later crowned king Louis VI of France

House of Bourbon

• 1673-1683 Louis-César de Bourbon (1673-1683), legitimized infant son of Louis XIV of France and Madame de Montespan;