Pope, who has scored 27 goals so far this season, was set to be out of contract at the end of the current campaign but has committed his future to the League Two leaders.
"I think everyone can recognise the contribution of Tom this season, both as a goalscorer and through his hard work for the team," said Vale manager Micky Adams.
"That contribution has been rightly rewarded and I welcome the opportunity to work with him for the remainder of this season and beyond."
Stoke-on-Trent-born Pope, 27, added: "I've made no secret of my desire to stay and I'm really pleased we have come to an agreement on a new deal.
"I know people have been talking about my goal tally this season but I think that's down to the style we play and how all of the players work for each other.
"The gaffer has put a lot of faith in me and I'm really pleased I have been able to repay that faith by committing to the club for a further term."