Stalingrad

Stalingrad, now known as Volgograd, is an important industrial city and the administrative center of one of the federal subjects or oblasts in Russia.

History
Natasha Romanoff was born in Stalingrad, although the majority of her childhood and early life hasn't been revealed.

When meeting Samuel Sterns in New York City after beginning his transformation, he was able to recognize Romanoff's birthplace by the faint traces of her accent, guessing that she hadn't been in her birthplace for many years before their encounter.