Archaeological finds related to the Bronze and Iron Ages on the Kocaeli Peninsula were obtained for the first time during the surveys undertaken since 2005. Pot sherds with dark grey and black burnished slips found on Adatepe in Dilovası, as well as two small vessels preserved in the Kocaeli Museum, resemble the Early Bronze Age I-II vessels of sedentary Anatolian and Aegean communities, while two small vessels made from light coloured clay can be likened to the Early Bronze Age II-III vessels of Central Anatolia. Two potsherds recovered in Adatepe are reminiscent of the coarse pottery that emerged in the Balkans and the Aegean region towards the end of the 2nd millennium BC; a small vessel held at Kocaeli Museum bears a likeness to the Knobbed Ware which emerged in Anatolia in the same period. Two of the flat axes that were recovered from Kocataşlar Mevkii in Kartepe, and a number of other items at the Kocaeli Museum, can be categorised as belonging to a type used between the Neolithic period and the end of the Bronze Age in Anatolia. We do not know the find-spots of the Late Bronze Age lugged axes and Iron Age arrowheads that are stored at the museum. Although it has been suggested that the Bronze and Iron Age settlements in the Kocaeli Peninsula may have been flooded or submerged under alluvial fill and modern settlements, field surveys have pointed to the possibility that some of the settlements from these periods were located on higher elevations.