The LEGO City book parts include sets that are associated with, or come from, LEGO City-themed books. These books, often published in collaboration with publishing companies, sometimes include exclusive LEGO pieces, minifigures, or mini-builds related to the City theme.
The LEGO City theme is based on city life with the sets depicting city and emergency services, police, fire, airport, train, construction, and civilian services. The City theme proceeded LEGO Town which was replaced with LEGO World City in before it was rebranded as City in 2005.