There is no telephone area code 660 in Italy. Area code 06 (or +39 06 in international format) is Rome.

Geographic area codes in Italy begin with 0. Unlike most countries, you do not drop the leading 0 from the domestic area code in international format.

Udine and Pordenone, in the far northeast of Italy, have area codes beginning with 043. (From outside Italy, dial +39 043X - do not drop the leading '0' as with most other countries.)

If you look at maps, you will not find area codes. Area codes can be found on area code locator websites. Another place to find area codes is in the telephone directory.

At first glance 0 it looks like an Italian number (0039 is the International code for Italy). However - there are no area codes that start with a zero.

Area of Italy: 301225 Square Kilometers