Purpose: Transgender and gender diverse (TGD) youth in North American clinical reports are predominantly White with relatively high socioeconomic status suggesting that access to gender-affirming care is inequitable. This study examined whether socioeconomic and social determinant of health discrepancies exist between a clinical population of TGD youth and surrounding communities. Methods: Patient postal codes were used to link the Ontario Marginalization Index (ON-MARG) to a clinic-based TGD youth cohort (n = 298). Using ON-MARG, each patient was assigned a quintile score from 1 (least marginalized) to 5 (most marginalized) on four marginalization measures. Mean quintile scores were compared to background populations. Census-based Toronto neighborhood-level data on ethnic diversity and educational status were also examined. Neighborhoods were categorized as highly represented, less represented, or unrepresented based on representation in the clinic cohort. One-way analysis of covariance was used to determine associations between neighborhood-level variables and the degree of neighborhood representation. Results: ON-MARG data demonstrated that clinic patients hailed from areas with more individuals having paid employment. Patients from Toronto and surrounding areas came, in general, from communities with fewer recent immigrants and visible minorities. Highly represented Toronto neighborhoods had smaller proportions of visible minorities and immigrants compared with less and unrepresented neighborhoods. Educational status, represented by adults with bachelor's degrees, was lower among unrepresented neighborhoods. Conclusion: TGD youth seen in clinic, particularly those from Toronto, are disproportionally White and socioeconomically advantaged. Further research is needed to better understand the underrepresentation of racialized and low-socioeconomic status youth and to inform strategies to improve access to care.