In this paper I document that highway construction firms in California, particularly those owned by blacks and Asians, exhibit
considerable racial segregation in that they are disproportionately located in zip codes with the greatest concentration of
own-race residents. I find that segregated firms serve a larger market than minority-owned firms that are not segregated and
that this effect is concentrated in black-owned firms. I next exploit the segregation of firms to examine the effect of affirmative
action on the success of minority-owned firms. Following the significant curtailment of affirmative action in California due
to a direct statewide ballot initiative, the number of highway construction establishments located in zip codes with the highest
concentrations of black and Asian residents fell relative to the rest of the state, even conditional on the number of non-construction
establishments. This suggests that affirmative action policies may play a role in the net survival rates of minority-owned
firms.