(He/His/Him) I work at the Minnesota Historical Society in Local History Services doing outreach in digital technologies to Minnesota's 87 County Historical societies/museums; 200 plus area and topical Historical societies, and a variety of other historical organizations. As such one of my major interests is to get more local history on Wikipedia, and to develop interest among local history organizations to contribute to Wikipedia. That said, the postings on Wikipedia are my own and do not necessarily represent the postings, strategies or opinions of the Minnesota Historical Society.
The Cash Money Theory of Notability The more money organizations have, the more marketing staff they can hire, who in turn can write press releases for and run ads in media outlets; resulting in media coverage of the well-healed organization; resulting in media Notability; resulting in Wikipedia articles. Organizations with less money thus may do the same or better work or have a great impact, but with no money to hire marketing staff to promote them, they are not covered by media and therefore are not Notable; resulting in no Wikipedia articles.
The (Media) Empire State Theory of Notability Communities concentrated with news outlets and media conglomerates are over covered in nearly every aspect; resulting in excessive media Notability; resulting in an excessive amount of questionable Wikipedia articles. Communities with no or less media cover, result in little or no media Notability; resulting in under representation in Wikipedia articles (aka: Urban bias). This is especially true in an era where the decline in local news outlets is accelerating.