1610 Background: Health care utilization and survival are correlated with social determinants of health (SDoH). Minimal data exists on the impact of SDoH within AYA Oncology. Methods: TriNetX, a de-identified healthcare research database retrospectively examined presence of SDoH billing codes among AYA cancer patients at various time points. Three cohorts were evaluated: ages <15, 15-39, >39. Cox proportional hazards regression was used to assess predictors of SDoH burden and survival in AYAs. Results: Baseline demographics were similar across cohorts. AYAs had higher baseline SDoH (25811, 5.2%) compared to <15 (3913, 2.9%) and >39 (58237, 1.8%). After diagnosis, AYAs had greater incidence of SDoH burden at 1y (OR 1.86 vs <15, 2.71 vs >39), 3y (OR 1.79 vs <15, 2.63 vs >39), and 5y (OR 1.8 vs <15, 2.5 vs >39). AYAs with any SDoH had higher occurrences of ED (OR 2.51) and ICU visits (OR 1.94). Within AYAs, baseline SDoH code was most prevalent in 30-39 age group, males, Hawaiian/Pacific Islanders, and lung cancers. The most common SDoH code in AYAs at diagnosis was homelessness at 57.8%. In a multivariate analysis examining incidence of SDoH in AYAs, positive associations were age 30-39; 1.95 (1.61-2.37), males; 1.49 (1.36-1.63), American Indian/Alaska Native; 4.44 (3.12-6.31), and presence of SDoH at diagnosis; 83.0 (71.6-96.3). Mortality in AYAs was associated with age 30-39; 1.81 (1.72-1.91), males; 1.58 (1.54-1.63), unknown race; 1.53 (1.48-1.58), and CNS tumors; 1.15 (1.06-1.25). Conclusions: AYAs with cancer have a high prevalence of SDoH burden at diagnosis and acquired. Within AYAs, age 30-39, males, and minority populations were most likely to acquire a SDoH code and have worse survival. The strongest association with both incidence of SDoH burden and mortality was a SDoH code at diagnosis. [Table: see text]