So because there is debate about apps, which emerged as bar-code scanners but require google Gemini AI access...
Your typical barcode has three starting digits, which identify the country, where the manufacturer is licensed. This does not strictly require the product to be made there. It is a starting point though. and you can do this easily. All codes with the three starting digits between 001 and 139 are licensed in the US
Example:
400 -> Manufacturer had his barcode licensed in Germany
807 -> Manufacturer had his barcode licensed in Italy, San Marino or Vatican
EDIT: 509 -> Manufacturer had his barcode licensed in the UK despite US product.
082 -> Manufacturer had his barcode licensed in the US
Still use your common sense. For produce check the country of origin, as often produce is sold under the brand of the reseller. Typical US imports include soy-beans and nuts.
Thank you, i have edited it. It is a good example, why it doesn't give a 100% safe indication. E.g. the 509 is UK.
I think this method is useful for lesser known brands. I looked for CocaCola labels and they are all over the world.