municipal library; city library; public library
A library established and operated by a city or municipality. Often used in contrast to 私立図書館 (private library) or 県立図書館 (prefectural library).
I borrowed a book from the city library.
The municipal library in this town is open even on Sundays.
私立図書館 is a privately established library, while 市立図書館 is run by the city. The readings are identical, so context or kanji is needed to distinguish them.
県立図書館 is a prefectural library, typically larger and serving a wider area than a 市立図書館.
Compound of 市立 (しりつ, 'municipal') and 図書館 (としょかん, 'library').