Boone is the only county in Indiana that grew at least as fast in the last three years as it had in the previous decade.
The county's population grew at an estimated 2.5 percent per year, topped only by Hamilton County's 4.1 percent annual rate, said Matt Kinghorn, state demographer for the Indiana Business Research Center.
Hendricks County's population increased at the third-fastest rate, at 2 percent annually, followed by Johnson County, at 1.6 percent.
The figures are based on population as of July 1, 2010, and estimates as of July 1, 2013.
Indiana's population growth reversed a six-year downward trend over those three years, expanding at .51 percent in 2013. Kinghorn said Indiana was the 30th fastest-growing state in the nation.
Of Boone County's seven municipalities, four increased in population between 2010 and 2013, the IBRC said.
See Wednesday's Times Sentinel for the full story.