At the time, publisher Mark Guerringue said The Portland Daily Sun was not yet profitable, but "We're poised for it, the pieces are in place".

[3] In 2013, the newspaper decreased its publication days from five to only two per week (Tuesdays and Fridays), citing a lack of advertisers.

The Sun featured local columnists Natalie Ladd, Cliff Gallant, Telly Halkias, Karen Vaschon, Curtis Robinson, and Bob Higgins.

Its sister papers owned by Country News Club and its affiliates also included The Berlin Daily Sun and The Laconia Daily Sun, both in New Hampshire, and a weekly, The Northern Light, in western Maine.

The Sun competed head-to-head with the Portland Press Herald, the largest newspaper in the state of Maine.