In its 2006 report, WHO showed that in Tanzania, about 126 children in every 1000 children of under five years old die before reaching their fifth birthday. Also, UNICEF (2007) found that at list 150 children die each day as a result of preventable and curable diseases. Therefore, the study was conducted so as to investigate the association between immunization status (including hepatitis B and Haemophilus influenza) and survival of children of under five years in rural areas around Dodoma Municipality. Findings shows, immunization coverage rates were high for the first vaccine doses and declined subsequently, suggesting that mothers were less likely to ensure that children were fully immunized. Factors associated with children’s immunization status were marital status, maternal age and place of residence.