Winners:
Macron: Paris
Le Pen: Aisne
Filion: Sarthe (so, I was wrong), French Polynesia with overseas
Mélenchon: Seine-Saint-Denis (Saint-Pierre-et-Miquelon with overseas (WTF))
Hamon: Finistère (Wallis-et-Futuna with overseas)
Dupont-Aignan: Essonne (but Haut-Rhin was surprisingly close)
Lassalle: Pyrénées-Atlantiques
Poutou: Creuse (Guyane with overseas)
Asselineau: Seine-Saint-Denis (Nouvelle-Calédonie with overseas)
Arthaud: Indre (Martinique with overseas)
Cheminade: Haute-Corse (Mayotte with overseas)
Fillon's best department was Hauts-de-Seine, not Sarthe, even though Macron beat him there.