Third places, as social infrastructures, play a key role in strengthening informal interactions, social cohesion, and social capital, but their unequal distribution can lead to the reproduction of spatial inequalities in neighborhoods. The present study aims to analyze the spatial inequality of access to third places in Zanjan city, employing a descriptive-analytical approach and exploratory spatial data analysis. Data on six types of third places were extracted from Google Maps and analyzed in ArcGIS Pro. To examine the spatial distribution pattern, Moran's I index, hot and cold spot analysis, and OLS and MGWR regression models were used.The results showed that 291 third places exist in the city, the distribution of which is heavily concentrated in the central core and the old fabric. The Moran's I index (0.119) with a significance level of 0.032 indicates significant spatial clustering of moderate intensity. Hot spots are located in the city center, while cold spots are situated in peripheral areas and new developments. The OLS model revealed a positive and significant relationship between access to third places and variables such as age, employment, population density, education, mixed land use, and density of commercial activities. The MGWR model also confirmed spatial non-stationarity of the relationships and showed that the intensity of the variables' effects varies across different parts of the city. The pattern of "core concentration – disadvantaged periphery" indicates spatial inequality in access to social infrastructure in Zanjan. The findings emphasize the necessity of policy-making based on spatial justice and the targeted distribution of third places at the neighborhood scale.