The town was founded in 1479 by the Pallavicino family, over an old Roman habitation, which had been the capital of the ancient Stato Pallavicino.
In 1949 the Italian entrepreneur Enrico Mattei discovered in Cortemaggiore's subsoil an important oilfield; with this oil a gasoline called Supercortemaggiore was produced, the only one refined from Italian oil.
The municipality's motto is Nihil sanctius quam recta fides cum sororibus associata - "Nothing is holier than a true faith combined with other virtues."
Architecture
Among the religious edifices in the town are the following:
San Giovanni: church built in 1625-1630 and frescoed by Robert de Longe in 1705
Annunziata: church and adjacent Franciscan monastery, built in 1487, it houses two works by Il Pordenone, an Immaculate Conception and a Deposition from the Cross.
San Giuseppe: built 1576-1593 by the brotherhood of San Giuseppe, and subsequently decorated with stuccoes by Bernardo Barca and Domenico Dossi in 1697-1701
Oratory of San Lorenzo: built in 1666.
Oratory of San Giovanni: started in 1625 by the confraternity of SS Sacramento.
Santa Maria delle Grazie fuori le mura or Madonnina: built by the priest Anotonio Bovarini in 1661.