The Church of Poland does indeed have overseas parishes--in Portugal, Brazil, and Sardinia. See the directory here:
http://www.orthodox.pl/Administracja/zagranica.htm
The Portuguese and Brazilian parishes formerly belonged to the Milan Synod.
Also, there are some parishes in the OCA that have several Polish parishiones. For instance, the St Joseph Church in Wheaton, IL has some Old Calendar festal Liturgies for the local, and rather large, Polish community, which are very well attended.
I hope this is helpful!
--Julio