Story County is a county in the U.S. state of Iowa. As of the 2020 census, the population was 98,537, making it the ninth-most populous county in Iowa. The county seat is Nevada; the largest city is Ames. The geographical center of Iowa lies in Story County, 5 miles (8.0 km) northeast of Ames.

Nevada is a city in, and the county seat of, Story County, Iowa, United States. The population was 6,925 in the 2020 census, an increase from 6,658 in 2000. Nevada is part of the Ames, Iowa Metropolitan Statistical Area, which is a part of the larger Ames-Boone, Iowa Combined Statistical Area. Nevada is the second-most populous city in Story County. The city's name is pronounced differently from the U.S. state of Nevada.