Vasilika is a community and a municipal unit of the Thermi municipality. Before the 2011 local government reform the municipal unit of Vasilika was an independent municipality, with the respective community being the seat. The 2021 census recorded 4,115 inhabitants in the community and 9,578 inhabitants in the municipal unit. The community of Vasilika covers an area of 56.81 km2 while the respective municipal unit covers an area of 200.336 km2.