 This exclusion was applied retroactively to the 2010 population figures.The Dayton–Springfield–Sidney Combined Statistical Area is a CSA in the U.S. state of Ohio, as defined by the United States Census Bureau.It consists of the Dayton Metropolitan Statistical Area (the counties of Montgomery, Greene and Miami); the Springfield Metropolitan Statistical Area (Clark County); the Urbana Micropolitan Statistical Area (Champaign County); the Greenville Micropolitan Statistical Area (Darke County); and the Sidney Micropolitan Statistical Area (Shelby County).