This study examined the hypotheses that (one) sociodemographic risk elements in youthful young children with autism spectrum disorders (ASD) and/or intellectual disability (ID) substantially vary by disability type, and (two) measures of income (indicate modified gross earnings, indicate federal taxes compensated, and suggest tax exemptions) drastically improve among 1994 and 2002, and are lower in people with a kid with ASD and/or ID in comparison with the basic population. A several supply surveillance technique employing a retrospective document review was employed to determine ASD and ID situations from a population of 26,108 eight-year-previous kids born in 1994 and dwelling in Utah in 2002. ASD with no ID (ASD-only, n = 99) circumstances were considerably a lot more likely to be male (P<0.01) and have mothers of White non-Hispanic ethnicity (P = .02). ASD with ID (ASD/ID, n = 33) situations had been drastically more most likely to be male (P<0.01) and have mothers older than 34 years (P = .03). ID without ASD (ID-only, n = 113) cases had been drastically a lot more most likely to have fathers older than 34 years (P<0.01) and were substantially less probable to have mothers with >13 years education and learning (P<0.01). Measures of revenue for cases at birth and at 8 a long time of age ended up not considerably reduced than the standard population and indicate modified income of situations significantly elevated from birth to eight a long time of age. Investigations centered on defining early sociodemographic chance variables by distinct endophenotypes of ASD may assist in figuring out chance factors for this intricate group of neurodevelopmental problems. Aggregate tax data might be a unique useful resource to employ for population-centered examination. Autism Res2011,4:xxx–xxx. © 2011 Worldwide Society for Autism Research, Wiley Periodicals, Inc.