When were there first cities and towns of sumer created?

The first cities and towns of Sumer emerged around 4500 BCE, during the Ubaid period, with significant urban development occurring by 3000 BCE in the Early Dynastic period. Key cities like Ur, Uruk, and Eridu became prominent centers of trade, culture, and governance. The rise of these urban centers marked the beginning of organized society and advanced cultural practices in Mesopotamia.