There are nearly 600 coal-fueled power plants in the U.S.

According to the most recent information available, there are 580 coal-fueled power plants in the U.S.
U.S. Energy Information Administration, Count of Electric Power Industry Power Plants By Sector, by Predominant Energy Sources Within Plant, Electric Power Annual with Data for 2010,
http://www.eia.gov/electricity/annual/html/table5.1.cfm .

The 10 states that generate the most electricity from coal are Texas, Ohio, Pennsylvania, Indiana, Illinois, Kentucky, West Virginia, Missouri, Georgia, and North Carolina.
U.S. Energy Information Administration, Electric Power Monthly, March 2012 edition, Table 1.7.B, “Net Generation from Coal by State by Sector, Year-to-Date Through December 2011,”
http://www.eia.gov/electricity/monthly/epm_table_grapher.cfm?t=epmt_1_7_b.