The village is adjacent to one town (the town of Holíč) and three rural villages (the village of Prietržka, Popudinské Močidlany and Kopčany).
The village of Trnovec is spread at an altitude of 181 m, the area of the cadastral territory of the village is 5,055,684 m2 (ie 505.6 ha). Of this area, the built-up area represents approx. 35 ha. The built-up area is characterized by rural settlements. The village has 320 inhabitants, population density is 125 inhabitants per 1 km2.