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Early identification of Autism Spectrum Disorder (ASD) is associated with positive outcomes, such as increased social communication skills. Previous research suggests that geographic location and socioeconomic status (SES) may influence age of ASD diagnosis. More recently, the effect of diagnostic overshadowing has been considered, namely that the presence of other, co-occurring conditions may delay an ASD diagnosis. To date, no study has examined the combined influence of multiple co-occurring conditions in the context of environmental and demographic variables to determine which factors capture unique variance in the age of ASD diagnosis. The current study examined the influence of system-level, parent demographic, and child demographic factors on parent-reported age of ASD diagnosis in a sample of 304 children, aged 6–17 (M= 11.5, SD= 3.3).