Vaccination is one of the most powerful protective strategies to reduce disability, morbidityrnand mortality among children under five years old. Existing evidence suggests that immunizationrnprevents 2 to 3 million deaths every year at globally. 1.5 million deaths of children could bernprevented if global vaccination coverage and outreach improved. Although global coverage ratesrnfor the third dose of the diphtheria, tetanus and pertussis vaccine (DTP3) had increasedrnsubstantially. The existing evidence also showed that 19.4 million children under 1 year of agernworldwide did not receive the three recommended doses of DTP in 2018, and 13.5 million childrenrnin the same age group did not benefit from any vaccination. In Ethiopia, 60â€“80% of the healthrnproblems were accounted by infectious and communicable diseases, about 16% of whose underfive mortality is attributable to vaccine-preventable diseases. The objective of this study used tornidentify immunization coverage level and associated factors with it among the children12-23rnmonths old in Ejere District, West Shewa Zone, Oromia region. The method of study wasrnconducted a community- based cross sectional study among 694 mothers who had children of agedrnamong 12-23 months from March to April 2020 in ten kebeles selected by clustering and simplernsampling technique from Ejere District, West Shewa Zone, Oromia region. Data were enteredrnand,cleaned using SPSS version 26. And also,data were analyszed using logistic regression.rnResults show that 38.6% of the children were fully vaccinated, whereas 39.6% didnâ€™t completerntheir vaccination according to schedule for routine immunization, the 21.8% of children were notrntook any immunization. Mothers who complete the attendance of ANC were 365(56.4 %) andrnmothers who delivered at health service center during their last child were 282(43.6%). Marriedrnmothers vaccinated their children were 2.813 times more than unmarried mother. Therngovernmental employment of mothers vaccinated their children were 4.17 (81%) times greaterrnthan not governmental employment of mothers. As the conclusion derived from the result, thernvaccination coverage in the Ejere woreda (38%) is low compared to the national target (90%) andrnglobal target (100%). And also, mothers` educational level, the mothers had information onrnbenefit of vaccinating the child, age of children, ANC follow up and institutional delivery arernsignificantly associated with in completion of the immunization coverage of children. The resultsrnof this study clearly show the great importance for the EPI practice of the vaccination coverage ofrnchildren. Therefore, the woreda health office, Health Bureaus and Federal Ministry of Healthrnshould be allocating specific budget, policy and strategy for EPI plan performance and need tornincrease community awareness through health education about fully vaccination coverage ofrnchildren.