From Grok:

Elon Musk’s main U.S. manufacturing and production facilities (as of late 2026) are concentrated heavily in Texas, with significant operations also in California, Nevada, New York, and a few other states. They span Tesla, SpaceX, Neuralink, The Boring Company, and xAI (AI compute sites).

Tesla

• Fremont, California — Primary vehicle factory (Model 3, Model Y, and related production; historically produced Model S/X). Large-scale assembly plant (former NUMMI facility).⁠Wikipedia
• Austin, Texas (Gigafactory Texas) — Major vehicle production (Model Y, Cybertruck, Cybercab) and Tesla headquarters. One of the largest facilities (~10 million sq ft on a large campus).⁠Wikipedia
• Storey County / Sparks area, Nevada (Gigafactory Nevada) — Batteries, electric motors, Powerwall, and Tesla Semi production.⁠Wikipedia
• Buffalo, New York (Gigafactory New York) — Solar Roof, Superchargers, and related energy products (former SolarCity site).⁠Wikipedia
• Lathrop, California (Megafactory Lathrop) — Megapack utility-scale energy storage systems.⁠Wikipedia
• Brookshire, Texas (near Houston; Megafactory Texas) — Megapack production.⁠Wikipedia
• Robstown, Texas (near Corpus Christi) — Lithium refinery (battery-grade lithium hydroxide; operational as of early 2026).⁠Austinio

Planned: Terafab semiconductor fabrication plant in Grimes County, Texas (joint Tesla/SpaceX effort; very large scale, targeting advanced chips for vehicles, robots, and AI/space uses).

SpaceX

• Hawthorne, California — Main design and production of Falcon rockets, Dragon spacecraft, and related systems.⁠Spacex
• Starbase (Boca Chica / near Brownsville), Texas — Starship manufacturing, testing, and launches; now serves as SpaceX headquarters. Includes large production facilities.⁠Spacex
• McGregor, Texas — Rocket engine development, testing, and related propulsion work (large test facility).⁠Spacex
• Bastrop, Texas — Starlink user terminals/kits and related electronics manufacturing (major and expanding site; also ties into satellite/Gigasat-related production).⁠Spacex
• Redmond, Washington — Starlink satellite manufacturing.⁠Spacex

SpaceX also operates major launch sites in Florida (Cape Canaveral / Kennedy Space Center area) and California (Vandenberg), which support production and operations but are primarily launch facilities.

Neuralink

• Fremont, California — Headquarters and primary manufacturing/R&D.⁠Wikipedia
• Del Valle, Texas (near Austin) — Expanding office, manufacturing, and research facilities (including cleanrooms and device production).⁠Statesman

The Boring Company

• Bastrop, Texas — Headquarters, manufacturing of tunnel-boring machines (Prufrock series), and global operations/control center.⁠Basenor

xAI (AI compute)

• Memphis, Tennessee and nearby Southaven, Mississippi — Colossus supercomputer/data center campuses (large-scale AI training and inference facilities, not traditional product factories). These are expanding rapidly.

Summary of concentration: Texas dominates (Austin area, Bastrop, Starbase/Boca Chica, McGregor, Brookshire, Robstown, planned Grimes County Terafab, and more). California remains important for Tesla Fremont, SpaceX Hawthorne, and Neuralink. Other states include Nevada, New York, Washington, Tennessee, and Mississippi.

Facilities continue to expand, and some (like Terafab and certain satellite/AI-related lines) are in early or ramp-up stages. Exact