Éragny[3] (French pronunciation: [eʁaɲi] ⓘ; sometimes unofficially called Éragny-sur-Oise pronounced [e.ʁa.ɲi.sy.ʁwaz]) is a commune in the northwestern suburbs of Paris, France.

List of successive mayors : Thibault Humbert (UMP) 2014 - 2020 Dominique Gillot (PS) 2001 - 2014 Murielle De Coster (UDF) 1995 - 2001 Louis Don Marino (PCF) 1971 - 1995 Situated on the Oise river, Éragny remained a small village until the 20th century.

Its original inhabitants probably settled around the town's fountain during the Roman period and named the place Heriniacus or Areniacus.

In the early 12th century the vicomte de Pontoise, Raoul Deliès, gave a church dedicated to Saint Germain of Paris to the Cluniac Priory of Saint-Martin-des-Champs.

He was treasurer of the constable Anne de Montmorency (1492–1567) and adviser of King Charles IX of France (1550–74).

[5] Their family insignia, "d'azur au sautoir d'or cantonné de quatre limaçons d'argent", was the model for the town's current one.

The village held a telegraph tower, part of a private line from Paris to Le Havre, until 1835.

Many streets were born on what is called "le plateau" and Éragny took today's aspect with about 16,000 inhabitants loving their good living town.