This category concerns the topic: names of cities.
It contains no dictionary entries, only other categories. The subcategories are of two sorts:
Subcategories named like “aa:cities” (with a prefixed language code) are categories of terms in specific languages. You may be interested especially in Category:en:Cities, for English terms.
Subcategories of this one named without the prefixed language code are further categories just like this one, but devoted to finer topics.