It is situated in the valley of the Besòs river, and is an important communications hub from Barcelona towards the north: the AP-7 Motorway passes through the municipality, as do the Renfe railway lines to Vic and Puigcerdà and to Girona and Portbou.

Mollet del Vallès has a number of buildings in the modernista and noucentista styles.

In the middle of the 10th century, Mollet was a little center of population that depended on the bishop of Barcelona.

Of the medieval past of Mollet, there is only remaining the Romanesque church of Santa Maria de Gallecs Mollet (which back then also included Parets) did not raise the population until the 17th century, then, a new church was built, but as ruling a town with 3 churches was hard, there were constant conflicts, which concluded with the separation of Parets.

[1] Opened on 29 March 1999, its principal collection comprises pieces from artist and collector Joan Abelló, which donated his collection to the city in 1996, creating the Joan Abelló Foundation, an independent organisation of the Mollet del Vallès Town Council.