The two rising country music acts received eight nominations apiece, including the second-year award show's top honors, artist of the year and album of the year.
Taylor Swift and Thompson Square are next with six nominations apiece for the fan-voted awards. Swift is also an artist of the year nominee and Kenny Chesney and Lady Antebellum round out the category.
Voting opened Thursday morning at the ACA web site. Fans can vote once a day until Nov. 11 in all categories except artist of the year, which closes Dec. 2.
The show airs live Dec. 5 from the MGM Grand in Las Vegas. Trace Adkins and Kristin Chenoweth host.