The Arms of Sainte-Adresse are blazoned : Quarterly, 1 and 4, azure a tower argent masoned sable, 2 and 3 gules an escallop Or; a cross Or surmounted by an inescutcheon tierced in pale sable, Or and gules.
The oldest known name of the commune was "Caput Caleti" mentioned in 1240. Later known as Saint-Denis-Chef-de-Caux, named after an ancient place of worship and its position on the cape.
In 1415, Henry V landed with his fleet, to claim the throne of France.
Starting in 1905, Georges Dufayel, a Parisian businessman, created a residential seaside resort known as The Le Havre Nice, at Sainte Adresse. The local architect Ernest Daniel directed operations. The “Avenue de Regatta” on the waterfront is designed in the image of the promenade des Anglais in Nice.
During World War I, Sainte-Adresse was the administrative capital of Belgium. The Belgian government in exile was installed from October 1914 to November 1918 in the Dufayel building, named after the businessman who had built it in 1911. It had at its disposal a post office using Belgian postage stamps.
During World War II, the Germans built several fortifications here for the Atlantic Wall, to defend the port of Le Havre.