How many prisons are there in Weibei prison mailbox 6 1?

Six prisons. According to official website of Weifang Public Security Bureau, in order to facilitate prison staff to contact their families, each prison area has ten mailboxes, the first number is the prison area code, and the following numbers are sorted from 0 to 9, that is, the mailbox of 6 1 in Weibei Prison is the sixth prison area. Weibei Prison in Shandong Province was founded in June 1952.