N.H. Rev. Stat. § 510:10
Service of writs against counties may be made upon one of the county commissioners and the treasurer for the county; against cities, upon the mayor or one of the aldermen and the city clerk, or in a city where the city manager is chief administrative officer and the head of the administrative branch of the city government, upon the city manager and the city clerk; against towns, upon one of the selectmen and the town clerk; against school districts, upon one of the members of the school board and the clerk of the district; and against village districts, upon one of the commissioners and the clerk of the district.
RSA 510:10
RS 183:8, 9, 10. CS 194:10, 11, 12. GS 204:10. GL 223:10. PS 219:10. PL 331 :10. RL 387:10. RSA 510:10. 1983, 383:71, eff. July 1, 1984. 2013, 46:1, eff. Jan. 1, 2014.