Migrant facilities along the US border are filled over capacity with 18,500 people in custody at four of the most overrun border crossings in Texas and Arizona.

Overnight thousands more migrants poured over the border, cutting down sections of border barrier near Lukeville, Arizona, and wading across the Rio Grande.

The processing center in the Del Rio, Texas, sector — which includes Eagle Pass, a current flashpoint of the crisis — has over 5,200 migrants in custody, putting it at 256 percent of its capacity, NewsNation reported, citing data from US Customs and Border Patrol.

Startling images from the camp taken by The Post show hundreds of migrants huddled together in rows separated by orange barriers.

Many were wrapped in foil blankets issued by authorities to help keep them warm against the elements.

Elsewhere in Texas, the Rio Grande Valley sector has more than 4,800 migrants in custody, putting it over capacity, and El Paso has 4,300 — although the facility there has been expanded to be able to handle the influx.

On Monday, CBP hit a record of 12,600 migrants encountered in 24 hours. Each month between August and October has seen over 300,000 migrants attempt to cross into the US, according to government data, a trend expected to continue until the end of the year.

The Tucson border region in Arizona is at 160 percent capacity with over 4,200 in custody, according to NewsNation. Data were not immediately available for the San Diego sector in California, which has also recently been hit hard by a huge influx of migrants.

Migrants are typically held in custody for a few days while they are evaluated by Border Patrol agents and then either entered into deportation proceedings or deemed eligible to pursue asylum claims and allowed into the US.

At Eagle Pass, migrants were seen crossing the river and handing themselves over to the Border Patrol to seek asylum on Wednesday.

US Rep. Tony Gonzalez (R-Texas) later posted a short video from inside one of the migrant tent facilities, showing hundreds of people huddled in a small space as border officers attempt to organize and process them.

Meanwhile, locals said they are worried about the impact of the influx on their day-to-day lives, including their safety.

Magali Urbina, who runs a pecan farm along the Rio Grande, says groups of up to 1,300 people cross the river onto her property before the National Guard escorts them to the processing area, Fox San Antonio reported.

“It’s not only gonna affect us locally, it’s gonna affect the entire United States,” Urbina told the outlet of her concerns for when the new arrivals are released.

“These people, the reality is they have nowhere to go, they don’t have a plan, they don’t have money, they don’t have permission to be working legally. Lots of things are going to happen because you can already see they’re getting desperate,” she insisted.

Urbina’s concerns are twofold with the fact that the Border Patrol checkpoints in the area are closed, she added.

She and other residents are calling for federal action to help make sure both residents and the migrants stay safe.

The Department of Homeland Security has not released up-to-date figures on the number of people ejected from the US, only saying it “removed or returned over 300,000 individuals” between May and September this year.

International freight train traffic on two routes into Eagle Pass has been stopped as CBP officers have been diverted to processing the newly arrived migrants.

Operations at one of the two road bridges into the town have also been reduced for the same reason.

“Unfortunately, CBP is unable to support the operation due to the migrant crisis at our border. It was our full intention to continue with the operation remaining hopeful that the migrant situation would be under control by the proposed date, unfortunately that was not the case,” said authorities in an update published in the Eagle Pass Business Journal.

The issue remains dire beyond the Eagle Pass area. On Wednesday morning, Fox News correspondent Bill Melugin shared a video on X of migrants huddled against the border wall in Lukeville, Arizona, part of the Tucson sector.

He said the recent practice of people smugglers bringing power tools and cutting wall barriers down to let hundreds of migrants cross continues.

The new arrivals come from call over, including India, Guinea, Liberia and beyond, Melugin said.