Social-economic security – is a basic need, both in the life of an individual, household, and in various associations of people, society and state in common. Security serves as the main condition of life of people in a certain area, that reflects as a more equal distribution of the benefits, as an economic efficiency, a a social-economic stability and security. Municipalities, realizing their specific functions, serves as primary guarantee of social-economic security of the population. Article discusses methodological aspects of the assessment of social-economic security of the state in common, as well as administrative territories of local government in particular. Article deals also with statistical indicators of social-economic security at the local level. Authors has generalized an integral indicator of social-economic development of the municipalities, that helped to estimate the level of social-economic security in the territories of municipalities in Latvia.