The seismic vulnerability of historic masonry structures, particularly slender buildings like bell towers, is a fundamental concern in heritage conservation. Recent earthquakes have confirmed the fragility of these structures, highlighting the need for large-scale preventive assessment approaches. This study proposes the application of a simplified EL0-level vulnerability methodology exclusively based on geometric parameters acquired through remote tools such as Google Earth Pro. The approach is applied to a sample of 109 historic bell towers in the city of Naples, Italy. Each tower is modelled using a set of geometric parameters, validated in earlier studies, without requiring on-site inspections and a vulnerability index is then calculated for each structure using the collected data. This methodology shows the feasibility of conducting rapid and low-cost vulnerability assessment in urban areas, thus establishing a basis for the prioritisation of interventions and the development of future seismic mitigation strategies.