What was Mesopotamia's capital city?

The other answers are pretty clear: Mesopotamia was a region, not a state, so there was no single capital. Also, as various groups controlled different areas of land, they established capital cities as they went along. read more

The capital city of the region changed over time with whomever was in charge. ca. 5000–4000 B.C. The site of Eridu. Some think this was the first capital of Mesopotamia. ca. 3500–3000 B.C. Uruk was the largest city of them all, and the capital. ca. 2350–2150 B.C. read more

Archeologists still haven't found the city of Akkad and are unsure where it is located. It was likely located in southern Mesopotamia just east of the Tigris River. Assur Located in northern Mesopotamia on the western bank of the river Tigris, Assur became the first capital city of the Assyrian Empire. read more

Mesopotamia is reunited under the kings of Ur, in the city of Ur, peacefully ruled the city states of the alluvial plain between the rivers Euphrates and Tigris for more than a century. An agricultural crisis scattered the people and shattered the peace. read more