U.S. Customs and Border Protection said Tuesday that the latest group of 311 people made their way around the pedestrian fence at Sunland Park late Monday.
The other group of 330 Central Americans was detained early Monday at the more remote Antelope Wells port of entry to the west.
While more than two dozen large groups of 100 migrants or more have been apprehended in the region since Oct. 1, authorities say this marks the first large group encountered at Sunland Park.
Like the previous instances, this group also included Central American families and unaccompanied juveniles.