From Longman Dictionary of Contemporary Englishcity hallˌcity ˈhall noun 1 PG[uncountable] American English the government of a city The recycling program simply hasn’t been a high priority at City Hall.2 [countable usually singular] the building a city government uses as its offices
Examples from the Corpus
city hall• Some downtown buildings, including city hall and the county courthouse, were evacuated.• The library is near City Hall.• When the authorities refused, the crowd sacked city hall.• They were married in March, in the city hall, with one witness.• How smart of you both just to go off to city hall and get married. 