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Small Area Income and Poverty Estimates

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Confidence Interval
A confidence interval is a range of values that, with some level of certainty, contains the true value the estimate is approximating. For example, each state and county estimate is listed with a 90 percent confidence interval. This means that for a particular estimate, if we carried out our estimation procedure and created a confidence interval 100 times, the actual value that the estimate is approximating is in that interval approximately 90 out of the 100 times. For more details about confidence intervals, please see A Basic Explanation of Confidence Intervals. For information on confidence intervals of the difference between two estimates, please go to General Cautions about Comparisons of Estimates.

Grade Range of Responsibility
The range of grades a district is financially responsible to provide. The specified grades are either provided from schools that operate within the district, or by purchasing instruction from neighboring districts. In most states, all districts provide K-12 education; however, some states have separate "elementary" and "secondary" school districts, each exclusively responsible for providing education in some grades in their shared territory.

ID numbers
For State and County tables: The first two digits represent the state FIPS code; the last three digits represent the county FIPS code.
For School District tables: The first two digits represent the state FIPS code; the last five digits represent the school district ID number.
More about FIPS codes.

Relevant Children
Each child is considered relevant to one and only one district. If a district provides all K-12 grades throughout their territory, all children within the territory are relevant to that district. If an elementary and secondary district occupy the same territory, the child is relevant to the district that provides the grade for that child's age.

Source: U.S. Census Bureau | Small Area Income and Poverty Estimates |  Last Revised: April 29, 2013