It uses the telephone area code 0382 and the cadastral code L440. Technical Context
The actual postal code (CAP) for mail delivery in Trivolzio is 27020 , not 018163. 018163 zip
Standard U.S. ZIP codes consist of 5 digits, sometimes followed by a 4-digit routing extension (ZIP+4). A search via the USPS ZIP Code Lookup confirms that 018163 does not exist as a domestic postal zone. It uses the telephone area code 0382 and