This is the 213th most frequent Russian word.
город
City.
Here, 'городе' is the locative case of 'город', used to indicate the place where someone lives.
Я живу в большом городе.
I live in a large city.
In this sentence, 'город' is in its nominative singular form, serving as the subject of the action.
Новый город был основан на берегу реки.
A new city was founded on the riverbank.
The word 'города' is in the accusative plural form, referring to various cities being the object of the action (visited).