Every child deserves educational opportunity and the chance to achieve, no matter his or her school, neighborhood or background. Unfortunately, large and persistent disparities in achievement among public school students in the District of Columbia indicate that all children here may not have the same opportunities. This Data Snapshot examines citywide achievement on the DC Comprehensive Assessment System (DC CAS) and the National Assessment of Educational Progress (NAEP), looking in greater depth at achievement in the fourth and eighth grades. This Data Snapshot also suggests the need for deeper analysis of the role that place and neighborhood--both where children live and where they attend school--may play in the achievement gap. (Contains 3 figures and 9 endnotes.)