Objective: The goal of the present study is to describe the ADHD phenotype from childhood to adolescence in Black and White girls in a community sample. Method: Primary caregivers enrolled in the population-based, longitudinal Pittsburgh Girls Study reported on girls' ADHD symptoms and impairment from ages 7 to 17; diagnostic subtypes were estimated based on meeting symptom criteria. Results: The prevalence of any subtype of ADHD ranged from 6.4 to 9.2% and from 2.3 to 6.4% for Black and White girls respectively; the inattentive subtype was most endorsed. A relatively equal number of new diagnoses at each age was observed. Persistence of ADHD diagnoses was typically 1 to 2 years. Conclusions: ADHD in the community is relatively common, with the inattentive subtype as the most common phenotype for Black and White girls. Research on developmentally sensitive periods for symptom exacerbation or new onset of ADHD in girls is needed.