Short answer. To your lawyer. Once a party has appeared through counsel, Rule 13, Section 2 directs that service shall be made upon the counsel, unless the court orders service on both lawyer and client. Papers served on your lawyer are, in the eyes of the Rules, served on you.
What the law says
If a party has appeared by counsel, service upon such party shall be made upon his or her counsel, unless service upon the party and the party's counsel is ordered by the court.
Rule 13, Section 2 — Filing and [s]ervice, defined. Read the full provision →
Filing and service are different acts
Rule 13, Section 2 separates two things that are easy to confuse. Filing is the act of submitting the pleading or other paper to the court; service is the act of providing a party with a copy of the pleading or any other court submission. Filing gets a document into the case record; service makes sure the other side actually receives it. Every paper in a case travels both paths, which is why the distinction matters. The question of who receives the copy — you or your lawyer — is a question about service, and the section answers it directly.
The counsel rule
The operative sentence: If a party has appeared by counsel, service upon such party shall be made upon his or her counsel, unless service upon the party and the party's counsel is ordered by the court. The word shall makes this the default, not a courtesy — once your lawyer enters an appearance, court submissions go to the lawyer, and service on the lawyer counts even if you personally never see the document. The exception runs through the court: only an order can require that both client and counsel be served.
One copy, however many lawyers
The section also settles the arithmetic when representation is not one-to-one. Where one counsel appears for several parties, such counsel shall only be entitled to one copy of any paper served by the opposite side. The mirror rule applies when a party has a team of lawyers: one copy, served upon the lead counsel if one is designated, or upon any one of them if there is no designation of a lead counsel. Serving any member of the team is serving the party — a client cannot complain that the papers went to the wrong lawyer on the case.
Why this matters to you as the client
Because service on counsel is service on you, deadlines can start running from a document your lawyer received and you have not read. The practical consequences: keep your lawyer's contact details current, respond quickly when your lawyer forwards anything, and make sure the court has your counsel's correct address on record. If you change lawyers, the withdrawal and the new appearance must reach the court — until then, papers served on the counsel of record remain effective. And if you have genuinely lost contact with your lawyer, act on it immediately; the case will not pause while you do.