AFC Telford United beat Gainsborough Trinity to win the Conference North title and earn promotion back to the Premier at the first attempt.
Liam Watson's Bucks won 3-0, with goals from Mike Grogan, a Sean Clancy penalty and a late third from Shaun Whalley.
Fans rushed onto the Bucks Head pitch at the final whistle to celebrate Telford's first title win in 62 years.
North Ferriby United's 1-1 draw at home to Brackley Town meant a point would have been enough for Telford.
It is an immediate return to English non-league football's top flight for the Shropshire club who were relegated a year ago, leaving runners-up Ferriby to settle for a play-off spot.