This paper uses an analysis of survey data from urban Californians to determine whether patients' reports of access to care were associated with physician supply. On unadjusted analyses, higher levels of physician supply were associated with better access to care. However, this association was no longer apparent after adjusting for underlying population characteristics such as insurance status, income, and race/ethnicity. Poorer access to care in communities with lower physician supply appeared to be explained mainly by lack of health insurance and other population characteristics rather than by physician supply. We conclude that a more geographically equitable distribution of physicians in urban areas is unlikely to compensate for an inegalitarian system of health insurance.