Pikrolimni is a former municipality in the Kilkis regional unit, Greece. Since the 2011 local government reform it is part of the municipality Kilkis, of which it is a municipal unit. The municipal unit has an area of 164.059 km2. Population 5,442 (2011). The seat of the municipality was in Mikrokampos. From Mikrokampos, there was the great Macedonian Fighter of the area, during the Macedonian Struggle, Ioannis Koutsokostas. Another Macedonian fighter from Mikrokampos was, Evlampios Vyziinos. Xylokeratia is an historical village, named Klitae in ancient times.