This study examines how citizens perceive the increasing integration of digital and data-driven technologies in (sub)urban governance, commonly referred to as the ‘smart city’. Despite the increasing focus on citizen roles in the co-production of smart city initiatives, little is known about how the public perceives these developments and how such perceptions are socially shaped. Drawing on survey data from 3270 Belgian respondents, this study examines socio-demographic characteristics, familiarity (i.e. awareness, digital literacy and (prior) technology adoption), and risk–benefit perceptions as determinants of public attitudes toward smart cities. Results suggest that attitudes tend to be more positive for older, higher educated and male respondents, although the effects of gender and education become negligible once other variables are considered. Among the familiarity dimensions examined, only technology adoption significantly affects attitudes. This indicates that it is not formal knowledge about smart cities that shapes attitudes, but rather that attitudes are dependent on experiences with different (digital) technologies that smart cities might provide. The strongest associations arise at the level of risk–benefit perceptions: perceived misuse risks are negatively associated with support, whereas perceived benefits exhibit a substantially stronger positive association than perceived risks. These findings refine the traditional ‘familiarity hypothesis’ by demonstrating that public attitudes toward smart cities are not necessarily driven by formal knowledge, but rather shaped by everyday technological experiences and perceptions of potential risks and benefits. This insight highlights the importance of experiential and evaluative dimensions in public perceptions of emerging forms of data-driven governance.