Google announced on the Google News blog that in an effort to promote local news publications, when stories in their local towns go national, Google News is now using a "local source" tag. The interesting thing is that this tag is automated, you cannot markup your content to have this tag.
Instead, Google News will automatically tag your publication as being local to a specific geographic reason based on the history of your stories. Google said, " "Local Source" articles are identified automatically by looking at where a publisher has written about in the past and comparing that to the story location."
Google added that with their "goal to surface diverse perspectives," they're "excited to share that a new "Local Source" tag is now live across all Google News editions." "This new feature brings greater exposure for local news outlets reporting on stories that have gone national," Google added.
It can be found in the expanded story box on news.google.com and in the Google News & Weather iOS and Android apps.
Forum discussion at Google News Help.