538data/region-survey/README.md

SOUTH.csv and MIDWEST.csv contain individual responses from surveys about regional identification conducted for FiveThirtyEight by SurveyMonkey.

See also:

• http://fivethirtyeight.com/datalab/which-states-are-in-the-south/
• http://fivethirtyeight.com/datalab/what-states-are-in-the-midwest/
• http://fivethirtyeight.com/datalab/weve-published-our-data-on-the-south-and-midwest/