This article examines whether or not municipal mergers change the perceived level of public services within a merged municipality. I argue that residents of small municipalities that merge with larger neighbors lose political powers after the mergers; they become a minority within a merged municipality, and their electoral importance declines accordingly. As a result, the level of public services to the merged localities is expected to decrease. I test this argument by focusing on the nationwide concurrence of municipal mergers in Japan that rapidly took place in the 2000s. I conducted a survey of voters in rural municipalities that merged and those that remained intact during this wave of mergers. Using the responses to the survey, I demonstrate that the level of public services, as perceived by the respondents, declined more significantly in municipalities with mergers than in municipalities without.