This study involved 999 married women, aged between 15 and 49, at the twelve health centres in the province of Trabzon in order to determine the ratio of consanguineous marriages, the factors affecting this situation, the ratios of abortion and the mortality of children in the first year. This ratio of consanguineous marriages was found 20 percent. The education levels of the great majority of these were low. The average age was 19. These were most frequently between children of paternal aunts and maternal uncles (39%) and these marriages, the ratio of abortion and children mortality were higher than others (P < 0.05). Furthermore, it has been established that the kind of marriage has considerably decreased in Trabzon lately, but we believe that this reduction will be higher in the future since the education levels rapidly increase.