Previous literature shows an association between several psychosocial factors or life events in general and delinquency. Factors such as gender, cannabis and drugs use are firmly connected to delinquency. Similarly, interpersonal violent behavior appears to be more frequent in people with lower socioeconomic status and people with lower education. The association of these factors with the violent or non-violent crimes, especially in Greek research literature, is very limited. The present study is an attempt to examine in a Greek prison population the correlation of demographic and psychosocial factors with violent and non-violent crime. The prison population sample comprised of 308 males from a total of 1300 prisoners, aged between 18 and 77 years old. The survey was conducted from January 2012 until August 2013 in Korydallos and Domokos prisons. In our prison population sample most of the crimes were non-violent. The prisoners were urban dwellers, of young age, were not married and were in short-term relationships on average. They had completed their military obligations, were not live alone, and have been working in the last six months before being imprisoned, in manual labor. They had low-grade education and poor school achievements, had been brawling with classmates and had history of antisocial behavior (liked to "put fire" and abuse animals). They report good relationships with their parents; however, they had experienced violence in parental relationships and some kind of violence, mainly by the father and secondarily by the mother. They have not been involved in gangs necessarily and have a history from a young age, of alcohol, cannabis and drugs use. Cannabis use history was reported by 208 prisoners (67.5%) and 133 (63.9%) of them started using at the age of 10-15 years old. A total of 179 prisoners (58.5%) reported a history of drug use, about half of them (50.3%) reported being addicted to a combination of drugs. For 40.8% (n=73) drug use was initiated in the age of 10-15 years old, while the largest percentage (46.4%) of prisoners mentioned as starting age 16-20 years old. Although the above features underline the great differences between prison population and the general population, there are no significant associations of these factors with violent or non-violent crime. However, the prisoners with drug use history were 65% less likely to have been sentenced for violent crime. Also, the prisoners exempted from their military duties, were 49% less likely to have committed violent crime.