N.H. Cir. Ct. Dist. Div. R. 6.2

A Local Ordinance Citation and Summons may be served upon the defendant by postpaid certified mail, return receipt requested. Return receipt showing that the defendant has received the citation and summons shall constitute an essential part of the service and shall be filed with the court prior to the arraignment. If service cannot be effected by certified mail, then the Court may direct that service on the defendant be completed as in other violation complaints.