The government says the report, which blamed most of the killings on the military, as "unfounded".
Capt Ibrahim Traoré, who seized power in 2023, says democratic rule would not work for his country.
He used the girls' mother's life-threatening illness as an opportunity to demand sex, said the US Office of Public Affairs.
Seven men from Ghana were "burnt beyond recognition" after Islamists raided the town they were travelling through.
Yameogo Aminata says her four sons were slaughtered and her daughter is missing.
Insurgents have carried out a wave of drone strikes on military positions in the region.
The US signals that restoring democracy is no longer a priority and it is ready to work with Burkina Faso, Mali and Niger.
The multiparty system had been "promoting division among citizens", the country's interior minister said.
Paul-Henri Sandaogo Damiba has not commented on the accusations from Burkina Faso.
