The Dayton metropolitan area is the metropolitan area centered on Dayton, Ohio. It is the fourth largest metropolitan area in the state of Ohio, behind Cincinnati, Cleveland, and Columbus.

Definitions

Dayton Metropolitan Area (also known as Greater Dayton), as defined by the United States Census Bureau, is an area consisting of three counties in the Miami Valley region of Ohio and is anchored by the city of Dayton. As of 2000 it is the fourth largest metropolitan area in Ohio and the 61st largest Metropolitan Area by Population in the United States. As of the 2010 census, the MSA had a population of 841,502. The larger Dayton–Springfield–Greenville-Sidney Combined Statistical Area includes Greene County, Darke County, Montgomery County, Miami County, Clark County, Ohio|Clark County, Shelby County, and Champaign County and had a population of 1,080,044 according to the 2010 Census.

The Dayton-Springfield-Greenville-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). As of the 2010 Census, the CSA had a population of 1,080,044.