Why is the mailing address for taxes a PO Box in Boston?

The mailing address is that of a  lock box that is associated with Leader Bank. Leader Bank receives Town of Hanover tax payments and processes them. The information is then sent to the Town via a secure virtual lockbox and is applied to the correct account.

The mailing address of the Town of Hanover Leader Bank Lockbox is:

Town of Hanover
Dept. 1400
PO Box 986535
Boston, MA 02298-6535

This lockbox is used for real estate and personal property taxes only.