Normally, papers must be served in the state where you filed your lawsuit. Thus, you can't sue someone in a Massachusetts court and serve papers on them in Oklahoma. An exception involves suits having to do with motor vehicle accidents or lawsuits against out-of-state owners of real estate located in-state. Many states allow out-of-state service on this type of claim. Your small claims court clerk will show you how this is handled in your state.
Assuming the person you want to sue resides or does business in your state, you can serve papers anyplace in the state. (See Chapter 9.)