Miejski Zakład Komunikacji S.A. in Ostrów Wielkopolski is a public transport company providing bus services within the city and the surrounding county. Its website helps passengers plan journeys with access to current timetables, fare information, concession details and travel regulations. Customers can purchase tickets through several channels, including the Ostrów electronic ticket system, stationary and onboard ticket machines, and the Mobilet service.

The company also offers bus rentals, with information about available vehicles and rental conditions provided online. Businesses and other organisations can promote their message through advertising on buses, onboard LCD screens and posters. Beyond passenger transport, MZK provides workshop services, including vehicle servicing, technical inspections at its vehicle inspection station and tire services.

MZK shares service announcements and operational updates, such as changes to bus routes during public events and holiday periods. Based in Ostrów Wielkopolski, the company combines local transport operations with passenger information and related vehicle and advertising services.