It is the second group to arrive there since Sunday, when about 80 LGBTQ migrants arrived by bus.
Several thousand more migrants in at least three caravan groups are making their way through Mexico toward the border.
The bulk of the main caravan appeared to be about 1,100 miles (1,800 kilometers) from the border, but was moving hundreds of miles per day. Larger groups are expected to arrive in the coming days, human rights organisations said.
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Some small groups had broken off along the way and went on ahead, either using buses, trains or long-haul truck rides to get to the border quicker.
The group reportedly headed to Guadalajara on Monday.
The caravan, which primarily includes people from Guatemala, Honduras and El Salvador, began with about 120 people and grew to about 7,000 at its peak, United Nations figures indicate. Some 533 migrants had requested a voluntary return to their countries, the government reported. At the same time, US Border Patrol and soldiers, which have been sent as reinforcements, are preparing to meet the caravan and prevent illegal crossings of the border.
That still leaves a substantial path for the tens of thousands of people who cross daily: Twenty-three lanes remain open at San Ysidro and 12 at Otay Mesa.
The San Ysidro port of entry there is "at capacity", and border officials anticipate asylum seekers will be stranded in Mexico until they can be processed, according to a statement emailed to ABC News by U.S. Customs and Border Protection. "These preparations include training exercises, deploying additional CBP personnel, and partnering with the US military to harden our ports of entry and the border area between those legal crossings into the U.S".