Alexandra Sirota, North Carolina Justice Center, May 2012. Recently available data from the N.C. Department of Revenue show that more than 883,000 North Carolinians claimed the credit in 2010 and that they live in every county in the state.
http://ncjustice.org/sites/default/files/BTC%20Brief%20-%20EITC%20and%20Downturns.pdf