The assessment of citizen service quality is an important indicator of the efficiency of public administration institutions. The assessment provides information enabling constant improvement of mechanisms that provide public services and innovative solutions in the areas of public service delivery and organization; it is very important for individuals with specific needs and for development of society. The article presents analysis of peculiarities and criteria of the citizen services’ assessment in Klaipėda and Vilnius counties’ municipalities. The importance and peculiarities of implementation of the citizen service assessment is indicated in the documentation of the Republic of Lithuania on public management development and in the scientific literature on new public management and quality management. According to the regulating documents, all public institutions must annually accomplish an assessment of the citizens’ requests analysis and service quality analysis and later publish these assessment reports on their websites. The empirical research in Klaipėda and Vilnius counties’ municipalities revealed that eight of 15 municipalities do not implement any assessment of citizen service and do not publish their reports. Yet other municipalities most often evaluate the following indicators: admission waiting time; politeness of the officer; duration of time necessary to receive an answer to the question of application; the reason, question or request of application; applicant’s gender and age.