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We present the state of the modernized, upgraded and enhanced National Network of Seismic Stations (NNSS) of Slovakia at the end of the year 2017 and the importance of the Project: Modernization and enhancement of the National Network of Seismic Stations which took place in years 2001–2004. In this period some stations were modernized and upgraded and several new stations were built in various places in Slovakia to increase ability to localize seismic events on the territory of Slovakia and adjacent areas. Before the year 2001 the average number of localized earthquakes on the territory of Slovakia was only 7 per year. The breakthrough occurred in the year 2005 with the fully operational network when the number of localized earthquakes with epicentre on the territory of Slovakia was increased up to 50. Now this number is approximately 70–90 earthquakes per year. We present the changes in the NNSS in the last 13 years, obtained results (some of them are preliminary), advantages and weaknesses of the NNSS and future plans toward further improvements of our seismic network system.