Local Search Ranking Factors
, a survey of many leading local SEOs, founded in 2008 by David Mihm and acquired by Moz in 2013, has resumed publication after David's departure from Moz in 2016 to start a new company.
This year's survey, published by Moz under the editorship of Darren Shaw, is an impressive and well-organized guide, available here... 2017 Local Search Ranking Factors https://moz.com/local-search-ranking-factors
Surveys from prior years get their own dated permalink. Until 2018 appears, 2017 will appear at the above url.
The 2017 survey includes an overview of major changes, a list of definitions, an introduction to the types of ranking factors considered... lists of the "Top 50 Local Pack Finder Factors" and the "Top 50 Local Organic Factors", a well-organized, well-edited Comments section, and a bibliography and list of contributors.
I'm just beginning to scratch the surface of this major article. Well worth some time if you're involved with local SEO, and, I would suggest, even if you're not. Over the years, local search has brought together a great many personalization and localization factors that have found their way into regular organic search, and, with the explosion of mobile, it's very likely that this will continue.