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Social Vulnerability Index

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Every 2 years
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County, Census Tract

The Centers for Disease Control and Prevention (CDC) developed a Social Vulnerability Index (SVI) using 16 census variables. Social Vulnerability is the extent to which an area's social conditions affect the response and prevention of disasters. The SVI was created to help differentiate the relative vulnerability of a particular place from those around it.

The 16 census tract variables are sorted by commonality into four different themes: Socioeconomic Status, Household Characteristics, Racial and Ethnic Minority Status, Housing Type and Transportation. These four themes comprise the SVI.

The SVI’s objective is to allow key stakeholders to design more beneficial and efficient response strategies and predict the level of support and resources needed in an area following a disastrous event. It allows for improved response preparation, funding allocation, and resource distribution proportionally across communities by their vulnerability.
Centers for Disease Control and Prevention/ Agency for Toxic Substances and Disease Registry/ Geospatial Research, Analysis, and Services Program. CDC/ATSDR Social Vulnerability Index. 2000-2020 Database. https://www.atsdr.cdc.gov/placeandhealth/svi/data_documentation_download.html.
The SVI is presented as a percentile that allows a location to be directly compared to areas around it. An SVI of zero means that an area is least vulnerable. An SVI of one means that an area is most vulnerable. For further information on how the SVI is calculated see CDC Social Vulnerability Index.

The county-level SVI Percentile compares the counties within Delaware to all other counties within the United States. The interpretation of the county level percentiles is that N county with an SVI of X means that X % of counties in the United States are less vulnerable than N county and (1-X)% of counties in the US are more vulnerable than N county (where N is the county selected for interpretation and X is the SVI Percentile of the chosen county).

The census tract level SVI Percentile compares the census tracts within Delaware to all other census tracts within Delaware. The interpretation of the census tract level percentile is that Census Tract N with an SVI of X means that X % of census tracts in Delaware are less vulnerable than Census Tract N and (1-X)% of Census Tracts in Delaware are more vulnerable than N census tract (where N is the census tract selected for interpretation and X is the SVI Percentile of the chosen census tract).

This interpretation can apply the understanding for the county and census tract level data to the Overall Rating Percentile and the Percentile for each of the four themes that make up the Overall SVI Percentile.

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This dataset appears on the following pages:

Name Indicator Type Latest Date With Data
Age 17 or Younger Crude Percentage 2020
Age 65 or Older Crude Percentage 2020
Cost-Burdened Households with Income Less Than $75,000 Crude Percentage 2020
Crowding Crude Percentage 2020
Disability Crude Percentage 2020
Group Quarters Crude Percentage 2020
Household Characteristics Index 2020
Housing Type and Transportation Index 2020
Living Below 150% of the Poverty Line Crude Percentage 2020
Living Below the Poverty Line Crude Percentage 2018
Minority Crude Percentage 2020
Mobile Homes Crude Percentage 2020
Multi-Unit Structures Crude Percentage 2020
No High School Diploma Crude Percentage 2020
No Vehicle Crude Percentage 2020
Per Capita Income Count 2018
Racial and Ethnic Minority Status Index 2020
Single Parent Households Crude Percentage 2020
Social Vulnerability Score Index 2020
Socioeconomic Status Index 2020
Speaks English "Less Than Well" Crude Percentage 2020
Unemployed Crude Percentage 2020
Uninsured rate Crude Percentage 2020
More Information
Data Source
Centers for Disease Control and Prevention
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