Preston's 4-0 victory in the final means Swindon will remain in League 1 for the 2015/2016 campaign.
A Jermaine Beckford hat-trick, plus a goal from Paul Huntington, ensured Simon Grayson's Lilywhites secured a return to the Championship.
With Swindon's name added to the League 1 line up for the forthcoming season, City now know every one of their league opponents for the new campaign.
City's league fixtures for next season will be confirmed on Wednesday 17 June 2015.
Including Phil Parkinson's side, the full list of competitors in League 1 for the 2015/2016 campaign looks like this: