St. Aegyd is divided into the districts of Kernhof, Lahnsattel, Mitterbach, St. Aegyd am Neuwalde, and Ulreichsberg. The town is located in the Mostviertel. 87.61 percent of municipal territory is forested.
St. Aegyd am Neuwalde's mayor is Herbert Mitterböck and its chief officer is Adolf Praschl. In the municipal council, the mandates for its 21 seats are distributed as follows: SPÖ 13, ÖVP 6, FPÖ 2, others 0.