Incorporated on March 1, 1894, Carnegie was formed when two smaller boroughs, Mansfield and Chartiers facing each other across Chartiers Creek and joined by family, geography, industry and religions, merged.
The borough covers 1.3 square miles, and in the 2000 census reported a population of 8,396. Over 400 businesses have a home address in Carnegie, from sole proprietors to corporate headquarters. Carnegie can accommodate any office or retail need from home-based to multi-story office building.
The downtown area on and about Main Street hosts shops and small offices in the small-town style of storefronts along the street with living space or businesses on the second or third floors. Many of the large stately houses along Washington Avenue have been gentrified into offices, but maintain the look and feel of the family homes they once were. To complement the small to medium businesses, Carnegie Office Park is at the Rosslyn Farms exit of the Parkway with six multi-story buildings and an extended stay hotel for business travelers.