Underwood broke the record over Faith Hill, Linda Ronstadt and Taylor Swift, who had hit the top of the charts with three albums each.
While Swift actually has had five No. 1s on the Billboard 200, only three also reached the Top Country Albums chart. Her two latest albums, “Reputation” and “1989,” were pop.
Garth Brooks reigns with the most country albums topping the Billboard 200, with nine.
Underwood also surpassed the previous record of biggest sales week by a female artist so far in 2018.
That title had been held by rapper Cardi B’s album “Invasion of Privacy,” which debuted at No. 1 in April with 255,000 units sold.