Ferry County is a county located in the U.S. state of Washington. As of the 2010 census, the population was 7,551, making it the fourth-least populous county in Washington. The county seat and largest city is Republic. The county was created out of Stevens County on February 21, 1899 and is named for Elisha P. Ferry, the state's first governor.
The population of Ferry County in 2010 was 2010.
It's definitely incorrect because the population 2010 was 7,551, not 2010. It's difficult because the text explicitly mentions 2010, so phrasing the question this way probably confused the system due to this.