 Seventy percent of the United States ' electrometallurgical ferroalloy manufacturing employees are located in Ohio . The entire industry as a whole , although not as concentrated as the electrometallurgical ferroalloy manufacturing sector , employs 34 @,@ 000 paid workers at 234 individual workplaces . Ohio 's 234 workplaces make up 9 @.@ 5 % of the United States industry 's workplaces , and the 34 @,@ 000 paid workers make up 13 @.@ 6 % of the United States industry 's workers . Of these workers and workplaces , the sector of iron , steel , and ferroalloys make up the largest sector in Ohio 's industry , with 17 @,@ 000 paid workers in 73 workplaces . 
