Comparable sales in the U.S. rose 7%, while comparable sales at international stores gained 13%, the company said in a statement.
For the 13-week period ending Nov. 28, comparable sales rose 7%.
The figure included sales from Costco's joint Mexico venture, the company said in a statement. Without those sales, the increase would have been 9%.
For the 13 weeks ending Nov. 28, Costco posted net sales of $20.59 billion, up 11% from a year earlier. Excluding Mexico sales, the increase would have been 8%.