This paper presents the analysis of relationship between nitrogen surplus for agriculture (NS) and some socio-economic properties among the regions of Turkey for the period of 2007-2011. The correlations of NS with gross domestic product (GDP) per capita (0.66), permanent meadows and grassland share in utilized agricultural area (UAA) (-0.55), population density (0.49), out-migration rate (-0.42), the export value of agriculture and forestry (0.35), illiterate share (-0.31), number of villages (-0.31), arable land share in UAA (0.29), the value of livestock per capita (-0.26) and permanent area share in UAA (0.23) were observed as statistically significant. A model was established by using C5.0 algorithm to define NS levels of the regions according to socio-economic properties of the regions. According to the model results; permanent meadows and grassland in UAA, GDP per capita, population density, and illiterate share were determined as the important variables to define NS levels of the regions. It can therefore be concluded that the permanent meadows and grassland share in UAA and GDP per capita are the main socio-economic properties having noticeable effect on the environmental quality and human welfare related to NS.