The role and place of migration services market entities in the system of institutional environment of the migration regulation are defined. Activities of the main participants of this market (the State Migration Service, Centers of Administrative Services (CASs), the State Enterprise «Document», foreign embassies, consular offices and visa application offices) are analyzed. It is emphasized that basic tasks of the State Migration Service concern work with foreigners and stateless persons, who appealed for protection in Ukraine; registration of residence and documentary accompaniment for individuals; issuance of foreign passports of the citizen of Ukraine. The necessity of optimization of their resource provision and popularization of activities is grounded. The authors emphasize that one of the most substantial problems related to organization of the activities of CASs, as essential subjects of the market of migration services, are the absence of minimum acceptable criteria for equipping the facilities, staff imbalance, insufficient content of their web pages and often invalid online registration of citizens. The apper proves that quality and amount of provided services in every center depend on volitional decisions and financial resources of local councils, which have created them. The authors note that regional CASs have the widest spectrum of services and the highest level of service. They render administrative services on non-commercial principles. In the article, the authors revealed the growing dynamics of foreign passports issuance for the period of 2015-ІІІ q. – 2018 showing a distinct shift to the biometric documents since December 2016. The necessity of setting up new visa application offices with wide range of authorities on rendering visa services for the purpose of minimization of services in visa centers is emphasized. Visa center is considered as a non-state intermediary organization, which is an official representative of an embassy responsible for acceptance and processing of documents necessary for obtaining the visa. VFS Global is the operator of visa centers in Ukraine. On the basis of the research, the authors propose the formation of unified information search base for collecting clear, complete and reliable data on providing the full range of migration services.