The 18-year-old, who joined City in October 2017 from hometown side York City, has committed her immediate future to the Club until 2023.
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The youngster is rapidly making a name for herself as one of the brightest young talents in the English game, having already clocked 15 first-team appearances, scoring five goals in her last seven appearances.
Thriving from the experience of playing alongside top-level international stars, Park asserts she could not wait to sign her first contract with City, deeming the Club the best place for her development.
“I'm over the moon to have my contract sorted," she said.
"I've absolutely loved every minute since joining City - with all the incredible resources we have, being here has helped me to develop massively and I can't wait to continue my growth as a player with this brilliant Club.
"Being in the same team with players that are at the top of their game - both at Club and national level - is absolutely invaluable for a young player like myself, and I'm incredibly excited for what the next few years will hold here at Manchester City."
Three of Park's five strikes marked her first senior hat-trick in our remarkable 10-0 FA Cup triumph over Ipswich Town, while Park also aided City's third Continental Cup success with goals in our Group Stage triumphs over Sheffield United and Aston Villa.
On the international scene, Park has also impressed for England’s Under-19s, notching 12 goals in 13 games in all competitions.
Head of Women’s Football Gavin Makel added: “Jess is an extremely exciting young player, who since joining us at the age of 16, has fitted seamlessly into our senior set-up.
“We believe in her ability and we will do everything we possibly can to help her reach her potential.”