Background: Gastric cancer (GC) remains a pervasive condition in the US with high morbidity and mortality. Race/ethnicity, lack of insurance, and poverty may all be contributing to this burden, especially in select populations. We evaluated the impact of these sociodemographic factors on GC outcomes at a hospital with high immigrant-patient populations. Methods: We conducted a retrospective study to identify patients diagnosed with GC between year 2010 and 2019. Data obtained from our institution database regarding patients' sociodemographic factors, including age, gender, race/ethnicity, insurance status and type, and neighborhood socioeconomic status. Likewise, information on tumor histology, anatomic location, and stage were also obtained. Kaplan-Meier analysis was used to plot survival curves and analyze the impact of insurance on survival outcome. Results: One hundred eleven patients were analyzed in this study, with a male-to-female ratio of 1.26:1. The median age at the time of GC diagnosis was 52.9 (range 27-87) years, with median survival time (±SD, range) of 12.7 (±17.7, 0.25-84) months. Most patients (69.4%) were uninsured—out of which 76.7% presented with advanced-stage disease. Among those, the majority (70.3%) were Hispanic, and 60.4% were non-U.S. citizens. The most common tumor histology was diffuse-type adenocarcinoma in 55% of patients. Patients insured were on public coverage (Medicaid), private insurance, and Medicare at 11.7%, 9.9%, and 9.0%, respectively. In terms of survival, lack of insurance (p = 0.012) and Medicaid insurance (p = 0.046) were associated with the worst survival outcomes in GC patients. Conclusions: Our study reflects the trends in GC outcomes distinctly linked to significant sociodemographic disparities. Patients who lack insurance coverage had the worst survival outcomes. Therefore, efforts such as increasing healthcare access for this population-type at risk of sociodemographic incongruities may enhance outcomes and are crucial in fighting GC.