Basically all over the world. Depends on which models,and which market they are sold in.
For N.A.
Boomer/DX assembled in Georgia USA
JX- Turkey(Fiat plant)
TN,TL,JXU-Italy(Fiat plant)
TS,TM, MXM-Basildon U.K. (Ford plant)
TG,MX Magnum- Racine Wisconsin
The old CIH C,CX,MXc,and MX Maxxums were made at Doncaster U.K. (Old IH plant,now owned by McCormick Tractors International part of the Agro group)