For the U.S., there isn’t a single official count of “illegal immigrants came in” from 2020 to 2024, because that phrase can mean different things: border encounters, estimated unauthorized population, or removals/repatriations. The closest widely cited proxy is U.S. border encounters, which USAFacts says were nearly 11 million between October 2019 and June 2024, and 2024 data through November showed 677,730 repatriations by ICE and CBP.

What that means

  • Border encounters are not the same as unique people or successful entries. A person can be counted more than once if they try multiple times.
  • Unauthorized population estimates are different again. Pew tracks the number of unauthorized immigrants living in the U.S., not annual entries.
  • Repatriations are removals plus returns, not arrivals. The 677,730 figure is a different measure from border crossing attempts.

Best available snapshot

Measure| What it counts| Available figure
---|---|---
Border encounters| Attempts detected at the border| Nearly 11 million from Oct. 2019 to Jun. 2024 6
Repatriations| Removals + returns| 677,730 from Jan. to Nov. 2024 10
Unauthorized residents| People living in the U.S. without authorization| Pew discusses population estimates, not annual inflow 2

Plain-English answer

If you mean border crossers or attempted illegal entries , the best public estimate available in the sources I found is nearly 11 million from late 2019 through mid-2024 , which is the nearest comparable span to your 2020–2024 window. If you mean how many actually entered and stayed , there is no clean official total in the source set I found.

TL;DR

The question doesn’t have one exact official number, but the strongest proxy is nearly 11 million border encounters from Oct. 2019 to Jun. 2024.