Since you are not in fear of him and he has not made any threats to harm you physically you are not likely to receive a Protection from Abuse Order against him ( often called a restraining order). You can however instruct him to cease all contact with you and if he continues he can be charged with harassment here in PA even though he lives in CA. Often in these cases the police will contact him on your behalf and tell him to cease contacting you and tell him if you get one more call or text they will file charges against him. That usually does the trick. If he has not complied go to the Lansdale PD where you live and explain the situation.
This information does not create an attorney /client relationship and should not be use or relied upon to make any decision in your case. Only consultation with your own attorney can provide you with the advice you need for your case.
Have an attorney send him a letter directing that he cease any and all contact. If it continues, notify the local police to determine if they wil file charges.
The last i checked, PFA Orders lasted 3 years. If you have good evidence of the calls, you can prosecute him for harassment here in PA. You will need a good address to serve him in CA. its unusual for a county clerk to give out info like that on the phone. Keep all of your evidence on this guy as you may need it in the future.