President-elect Donald J. Trump has vowed to slash immigration — both legal and illegal — and ramp up deportations on Day 1.

Immigrants are racing to get ahead of the crackdown.

Foreign-born residents have been jamming the phone lines of immigration lawyers. They’re packing information meetings organized by nonprofits. And they’re taking whatever steps they can to inoculate themselves from the sweeping measures Mr. Trump has promised to undertake after he is inaugurated on Jan. 20.

“People that should be scared are coming in, and people that are fine with a green card are rushing in,” said Inna Simakovsky, an immigration lawyer in Columbus, Ohio, who added that her team has been overwhelmed with consultations. “Everyone is scared,” she said.

People with green cards want to become citizens as soon as possible. People who have a tenuous legal status or who entered the country illegally are scrambling to file for asylum, because even if the claim is thin, having a pending case would — under current protocols — protect them from deportation. People in relationships with U.S. citizens are fast-tracking marriage, which makes them eligible to apply for a green card.