Tulcea County is a county of Romania, in the historical region Dobruja, with the capital city at Tulcea. It includes in its northeast corner the large and thinly-populated estuary of the Danube. In 2021, Tulcea County had a population of 193,355. The population density was 22.8/km², the lowest among the counties of Romania, due to the inclusion within the area …Tulcea County is a county of Romania, in the historical region Dobruja, with the capital city at Tulcea. It includes in its northeast corner the large and thinly-populated estuary of the Danube. In 2021, Tulcea County had a population of 193,355. The population density was 22.8/km², the lowest among the counties of Romania, due to the inclusion within the area of the lowly-populated Danube estuarial wetlands.