These chips are listed as being from Calexico, Ca. There might of been a J & S cardroom there, but I don't think these chips are them.
*** I haven't looked into this establishment ...I just found this card while looking through random boxes of information.

As far as Prarie City, Oregon....
I did a quick look and really didn't come up with anything. With 2 different orders (very small)I was thinking it might be a very small bar. (Possibly a home set, but why a 2nd order??) And 5 years apart?? The town only had 1100 people in it. I would say 1 table in this place if any.
It is possible that these chips ended up in Calexico, Ca for some reason. If anyone else has answers...please post.