Promotion in public libraries is used for the purpose of attracting new users and keeping existing ones and this is done through activities that libraries today mostly promote on different digital platforms (Facebook, YouTube, and Instagram). Public libraries are aimed at users, so the key to their successful work is achieving quality communication with users, meeting users’ needs for information and knowledge and promoting library activities and services in the wider community. The paper compares the websites of public libraries in the City of Zagreb and Zagreb County and analyzes the promotional activities (book presentations, lectures, panel discussions, exhibitions, workshops, projects, book club meetings, campaigns, theater performances) which can be found on the library websites and were held in April 2024 in public libraries in the mentioned two counties. The criteria for comparing promotional activities are the type, the age of the intended users and the number. Promotional activities held in April 2024 are more numerous in the public libraries of the City of Zagreb than in the public libraries of the Zagreb County. In April 2024 the most common activities in the public libraries in the City of Zagreb were book presentations, exhibitions and workshops and the most common activities in the public libraries of the Zagreb County were workshops.