Italian football has always been mostly a North West Italy affair. Italian oldest clubs are northwestern: Genoa CFC (1893), Juventus FC (1897), AC Milan (1899), with the exception of north-eastern Udinese (1898).
Just a few club could compete with north-western clubs, such as the two romans (Lazio and Roma), Napoli, Bologna and Fiorentina, but they never reached NW success. North-western football clubs that have won trophies are
CITY OF TURIN (PIEDMONT)
JUVENTUS F.C.

They have won so far 31 italian football championships, 10 Italy Cups, 6 Italian Super Cups, 2 Champions League, 1 Cup Winners' Cup, 3 UEFA Cups, 2 European Super Cups, 2 Intercontinental Cups.
TORINO F.C.

They have won so far 7 italian football championships, 5 Italy Cups, 1 Mitropa Cup.
CITY OF MILAN (LOMBARDY)
A.C. MILAN

They have won so far 18 italian football championships, 5 Italy Cups, 6 Italian Super Cups, 7 Champions League, 2 Cup Winners' Cup, 5 UEFA Super Cups, 3 Intercontinental Cups, 1 FIFA Club World Cup.
F.C. INTERNAZIONALE MILAN (INTER)

They have won so far: 18 italian football championships, 7 Italy Cups, 5 Italians Super Cups, 3 Champions League, 3 UEFA Cups, 1 FIFA Club World Cup, 2 Intercontinental Cups.
CITY OF GENOA (LIGURIA):
GENOA C.F.C.

They have won so far: 9 italian football championships, 1 Italy Cup, 2 Cup of the Alps.
U.C. SAMPDORIA

They have won so far: 1 italian football championship, 4 Italy Cups, 1 Italian Super Cup, 1 Cup Winners' Cup.

There is a much less popular team, especially abroad, called Pro Vercelli that is among the oldest clubs still active in Italy, and is now in Serie B (the second league of the italian football). They were a football superpower in the early days of italian football, then decayed.

CITY OF VERCELLI (PIEDMONT)
PRO VERCELLI

They have won so far: 7 italian football championships.

Which north-western Italy clubs do you know? And which do you like the most, or even support?