There are few American companies as iconic as Weber. Since 1952 the Weber charcoal grill has made its way into backyards all over the USA. It’s revolutionary and distinctive shape has become recognized worldwide. To this day most of their charcoal and gas grills are still American made in Illinois.
As always, make sure to double check since some models, and most all Werber accessories are made overseas.
Also you can see how their gas grills are made in this video.
Unfortunately neither factory have tours open to the public.