This map is more detailed: http://www.city-data.com/poverty/poverty-San-Francisco-California.html#mapOSM?mapOSM[zl]=9&mapOSM[c1]=37.780483978703025&mapOSM[c2]=-

This map is more detailed: http://www.city-data.com/poverty/poverty-San-Francisco-California.html#mapOSM?mapOSM[zl]=9&mapOSM[c1]=37.780483978703025&mapOSM[c2]=-121.73538208007811&mapOSM[s]=3&mapOSM[fs]=true http://www.city-data.com/poverty/poverty-San-Francisco-Calif... (down to the block group level) and it has additional information, such as change since the year 2000.