All the 100 series are made in Idaho.
As for the 300 series, only the 30x are (or were. I'm not sure the 301 and 303 are still in production.) made in Idaho, unless contract Schrade or Camillus, before the 300 series was made in-house.
The early black handle 877 was made offshore. The white handle "Walmart" 877 (2014? ... 2015?) were made in Idaho.
After the Walmart run, the black handle 877 was made in Idaho, until the model was dropped in 2017 or 2018.
I don't know about the rest.
I have no problem buying an offshore Buck. I'm still supporting Buck with my purchase. Also, the offshore knives have the same Forever warrantee/guarantee as the USA made knives. IMHO, if the offshore knives were sub-standard, Buck wouldn't guarantee them forever. They'd have a different guarantee.