This paper looks at pedestrian travel in Atlanta by US youths aged 5-18 years. Relationships between five urban form variables and walking in specific demographic subgroups are assessed using stratified logistic models and controlling for participant demographics. All five urban form and recreation measures were related to walking among whites, but only land use mix and access to recreation spaces were significantly related to walking in non-whites. There were more significant urban form physical activity associations in high-income than in low-income households. More urban form variables were related to walking in households with 3 or more cars than in households with no cars. Living in mixed use-areas and having access to recreational space were related to youth walking for transport in 11 of 13 population subgroups studied.