In 1998, 18 human settlements in the area of 93 km2 were searched for the Eurasian Scops Owl Otus scops territories (calling males) on central Pelješac Peninsula (S Dalmatia, Croatia). The playback method was used. In all settlements, 90 singing males were counted, which indicates that the total urban breeding population of Eurasian Scops Owl on Pelješac Peninsula was around 345 pairs in 1998. According to the author's opinion, the larger part of the Eurasin SCops Owl population breeds in the area within settlements. With the crude density of 10-15 pairs/10km2 and by considering the population dynamics recorded in the village of Kuna, the total population on Pelješac Peninsula was estimated at 230 to 575 pairs. Further ecological densities for several clumps of urban populations are presented. Ecological densities have found to be very variable (0.6-9.3 calling males/10ha), with higher densities recorded in settlements on the mainland of Pelješac Peninsula. Ecological density did not correlate with the size of the settlement.