Pew Charitable Trusts [to 16 January 2016]
http://www.pewtrusts.org/en/about/news-room/press-releases

.
Press Release
Pew Analysis Shows Access to Workplace Retirement Plans Varies Widely Across States
January 13, 2016
WASHINGTON—Wide differences in access to and participation in employer-based retirement plans exist across states, with variations by employer size and industry type as well as by workers’ income, age, education, race and ethnicity, according to a report released today by The Pew Charitable Trusts…

Report link: Who’s In, Who’s Out: A Look at Access to Employer-Based Retirement Plans and Participation in the States