The Pawnee Journal, according to Leslie Knope, is the town of Pawnee's "own Washington Post". It is owned by Sweetums. In the episode "The Reporter", Shauna Malwae-Tweep was a reporter who came from the Journal to interview Leslie on her pit project.
Outside of the show, the Journal created a Tumblr page so to expand their news platform. You can follow them by going to their blog. The link to the Journal's blog is under the "external links" section.