I will share this and then politely step away. Many here are saying different things — and they’re almost all correct. How? Because the law does indeed specify geographic boundaries. There are very real obligations/consequences connected to that.
Most US folks register and attend parishes of their own choice - and they are served in nearly every possible way there without consequence or fail, because the law was not made to be a hindrance but a protection.
In my own case, I’ve never attended Mass or received a sacrament in my own diocese, let alone my territorial parish. I’ve been registered at probably 5-6 others. Those have treated me as “theirs” and never given me grief whenever a need arose. I’ve been married, had children baptized, received anointing before surgery, served in multiple capacities, and my children are in parochial school. No questions asked (other than the standard forms and preparations). HOWEVER, when I inquired about the diaconate, I was told in no uncertain terms that Canon Law forbade my ordination outside the diocese of my residence.
Go where you feel spiritually fed. Few things will, in reality, be problematic. The experience of any number of people will also likely be yours, but it also doesn’t change what the law says.
