There isn’t a single official count, because “new auto plants” can mean fully new factories, battery plants, or major retooling at existing sites. Based on recent reporting, the U.S. does not appear to be in a true boom of brand- new car plant construction; most activity is expansions, upgrades, or EV/battery projects rather than lots of greenfield auto factories.

What the latest reporting suggests

  • One Reuters report says there is “scant evidence” of a surge in new car manufacturing facilities, and that automakers are mostly adjusting current plants instead of building many new ones.
  • Another analysis says the same thing: claimed plant growth is often reallocation at existing facilities, not fresh construction.
  • Some large investment announcements are still underway, including projects tied to Toyota, Stellantis, GM, and Hyundai, but these are a mix of new product lines, battery plants, and plant upgrades rather than all-new auto factories.

Practical answer

If you mean brand-new auto assembly plants , the number being built right now looks to be small, likely only a handful rather than dozens. If you include battery plants and major expansions , the number is much higher.

Why the number is fuzzy

  • Automakers often announce “new investment” even when work happens inside an existing plant.
  • Some projects are delayed, resized, or shifted from one site to another.
  • Battery plants can be counted separately from vehicle assembly plants, which changes the total a lot.

Bottom line

For a simple forum-style answer: the U.S. is seeing only a few truly new auto plants under construction, while most of the activity is expansions, battery facilities, and plant retooling.

TL;DR

Not many. The clearest read from recent coverage is a few new auto plants at most , with far more money going into upgrades and battery projects than into brand-new car factories.