By Julia Angwin, Jeff Larson, Lauren Kirchner and Surya Mattu for ProPublica - For decades, auto insurers have been observed to charge higher average premiums to drivers living in predominantly minority urban neighborhoods than to drivers with similar safety records living in majority white neighborhoods. Insurers have long defended their pricing by saying that the risk of accidents is greater in those neighborhoods, even for motorists who have never had one. But a first-of-its-kind analysis by ProPublica and Consumer Reports, which examined auto insurance premiums and payouts in California, Illinois, Texas and Missouri, has found that many of the disparities in auto insurance prices between minority and white neighborhoods are wider than differences in risk can explain. In some cases, insurers such as Allstate, Geico and Liberty Mutual were charging premiums that were on average 30 percent higher in zip codes where most residents are minorities than in whiter neighborhoods with similar accident costs. Our findings document what consumer advocates have long suspected: Despite laws in almost every state banning discriminatory rate-setting, some minority neighborhoods pay higher auto insurance premiums than do white areas with similar payouts on claims. This disparity may amount to a subtler form of redlining, a term that traditionally refers to denial of services or products to minority areas.