The age at/irst marriage has long been considered an issue ofprimaty interest in the disciplinesrnof marriage and the family as ,"ell women's studies. The issue has been taken on even greaterrnimportance recently due to the impact of a trend towards rising at first marriage on fertilityrnlevels, with further potentialjclr-reaching demographic, economic, and social ramifications, andrnalso affected by these factors. This study is primarily aimed al delermining important socio-economic and demographic factorsrninfluencing age at first marriage among women of reproductive age residing in Addis Ababa. Life time event history da/a collected Fom a total of 598 women of reproductive age grouprn(i.e15-49 years), who were living in Addis Ababa continuously starting from age 12 or birlhrnwere analyzed using descripl ive. survival plot and Cox regression models. Descriplive andrnsurvival plot were used to show Ihe differential in age at first marriage among differenl subgrouprnof covariate whilst , Cox regression was used as a multivariate analysis tool to measure the netrneffect of each covariate to effeclively utilize the samples who were not married so far at the timernof survey. Results of bivariate analysis show that there is an increasing trend in mean age at first marriagern(/i'om 27 to 29 years), and proporlion of never married (from 53 to 60 percent) between 1995 andrn2009. The result of Cox regression on the other hand, revealed that educational level,rneducational enrollment, work sial us as well as mother 's education are the most importantfactorsrnplaying significant roles in del ennining of age at/irst marriage amongfemale residents of AddisrnAbaba.