Aim and background: Immunization stands as a cornerstone of public health advancements, offering unparalleled effectiveness and cost-efficiency. The overall known vaccination coverage of resident children in Amreli was 60.1%, as per the National Family Health Survey-5 (NFHS-5). Regardless of these efforts, an issue of inequity is observed on different platforms. This study was an effort to understand the immunization uptake and its determinants influencing the utilization of immunization services among migrant children from September 2022 to February 2023. Materials and methods: Demographic and socioeconomic information, migration history, the child's immunization status, and the mother's usage of healthcare services were included in the questionnaire. Some of the data were taken from vaccination cards. Results: A total of 110 eligible mothers were contacted for the survey. Children were from 12 to 60 months old. Full immunization coverage was found among 38 (34.5%) children. Among them, 26.3% (12–24 months) and 73.7% (>24–60 months) children were having full immunization. Coverage of individual vaccines was Bacillus Calmette–Guérin (BCG) (94.5%), Penta 1 (41.8%), Penta 2 (38.2%), Penta 3 (35.5%), measles and rubella 1 (MR 1) (34.5%), diphtheria, pertussis, tetanus 1 (DPT 1) (34.5%), oral polio vaccine (OPV) booster (66.4%), and MR 2 (29.1%). The major factors associated with low immunization coverage were recent migrant status (p = 0.001), male gender (p = 0.04), age <24 months (p = 0.04), and home birth (p = 0.04). The study also found that settled migrants, female children, hospital-born children, and children whose mothers received antenatal care (ANC) visits from health workers were more likely to be fully immunized. Conclusion: The coverage among immigrants is less (34.5%) than that of children residents of Amreli (60.1%). The study highlights the need for targeted interventions to improve immunization coverage among children of migrant mothers.