Active immunization (vaccination) represents a medical intervention against an infectious disease with a main purpose to elicit a specific immune response of the human organism. It is also the most efficacious and cost-effective way to protect both the individual and the population. This research has shown certain differences in attitudes, knowledge and information about vaccination in the population. Although vaccination is one of the most successful public health interventions around the world, there are still representatives of anti-vaccination movement and parents who decide against vaccinating their children. The survey was conducted in the period from March 5 to April 30, 2019. A structured anonymous internet questionnaire was used, involving 366 respondents from the Koprivnica-Križevci County area. The results of this research show the sociodemographic status, attitudes, information and beliefs of the population of Koprivnica-Križevci County about the vaccination of children. The majority of respondents were women and most of the respondents were under 30 years of age, which was expected because the survey was conducted over the internet on social networks that are used predominantly by a younger population. According to the obtained results, it can be concluded that the Koprivnica-Križevci County population has relatively positive attitudes towards vaccination. If vaccination became legally non-mandatory, a higher percentage of the population would still vaccinate their children; nonetheless, the population is confused and concerned about a large amount of (often conflicting) information that they receive on a daily basis. Although the vaccination coverage is still relatively high and the population has positive attitudes about the vaccination of children, it is important to continue to educate the general population and the community – not only for the vaccination coverage to remain high, but also to prevent the negative campaign outcomes.