U.S. Census Bureau released poverty and income estimates for small areas, including counties and school districts, in an interactive map. Here is a picture of poverty estimates for children (between 5 and 17 years-old) by Iowa school district.
Darker areas represent a higher proportion of kids in poverty. Pockets of high poverty, 30%+, are predominately in southern Iowa. Not surprisingly, educational attainment for adults in these same school districts also tend to be lower.