What is CDC Social Vulnerability Index?ATSDR’s Geospatial Research, Analysis & Services Program (GRASP) created the Social Vulnerability Index (SVI) to help emergency response planners and public health officials identify and map the communities that will most likely need support before, during, and after a hazardous event.SVI uses U.S Census Data to determine the social vulnerability of every county and tract. CDC SVI ranks each county and tract on 16 social factors, including poverty, lack of vehicle access, and crowded housing, and groups them into four related themes:Theme 1 - Socioeconomic StatusTheme 2 - Household CharacteristicsTheme 3 - Racial & Ethnic Minority StatusTheme 4 - Housing Type & Transportation VariablesFor a detailed description of variable uses, please refer to the full SVI 2020 Documentation.RankingsWe ranked counties and tracts for the entire United States against one another. This feature layer can be used for mapping and analysis of relative vulnerability of counties in multiple states, or across the U.S. as a whole. Rankings are based on percentiles. Percentile ranking values range from 0 to 1, with higher values indicating greater vulnerability. For each county and tract, we generated its percentile rank among all counties and tracts for 1) the sixteen individual variables, 2) the four themes, and 3) its overall position. Overall Rankings:We totaled the sums for each theme, ordered the counties, and then calculated overall percentile rankings. Please note: taking the sum of the sums for each theme is the same as summing individual variable rankings.The overall tract summary ranking variable is RPL_THEMES. Theme rankings:For each of the four themes, we summed the percentiles for the variables comprising each theme. We ordered the summed percentiles for each theme to determine theme-specific percentile rankings. The four summary theme ranking variables are: Socioeconomic Status - RPL_THEME1Household Characteristics - RPL_THEME2Racial & Ethnic Minority Status - RPL_THEME3Housing Type & Transportation - RPL_THEME4FlagsCounties and tracts in the top 10%, i.e., at the 90th percentile of values, are given a value of 1 to indicate high vulnerability. Counties and tracts below the 90th percentile are given a value of 0. For a theme, the flag value is the number of flags for variables comprising the theme. We calculated the overall flag value for each county as the total number of all variable flags. SVI Informational VideosIntroduction to CDC Social Vulnerability Index (SVI)Methods for CDC Social Vulnerability Index (SVI)More Questions?CDC SVI 2020 Full DocumentationSVI Home PageContact the SVI Coordinator

Data are shown by region, age, income (including equivalised) group (deciles and quintiles), economic status, socio-economic class, housing tenure, output area classification, urban and rural areas (Great Britain only), place of purchase and household composition.

Household characteristics, including household type, age group of the reference person (the person responsible for housing decisions), employment status of the reference person, visible minority status of the reference person, and degree of difficulty for the household to meet its financial needs, by tenure including first-time homebuyer status, Canada, provinces, population centres, select census metropolitan areas (CMAs) and census agglomerations (CAs).

Main tables from The Effects of Taxes and Benefits on Household Income publication for 1977 onwards.

Household characteristics of dependent children, including the tenure of the household, overcrowding, and the number of adults employed in the household.

Distribution of household total income in constant 2020 dollars by household type (couple family, one-parent family, non-census family households) and characteristics of household members (number of earners and number of people in different age groups).

This layer shows households data from the 2020 Census Demographic and Housing Characteristics. This is shown by Nation, Consolidated City, Census Designated Place, Incorporated Place boundaries. Each geography layer contains a common set of Census counts based on available attributes from the U.S. Census Bureau. There are also additional calculated attributes related to this topic, which can be mapped or used within analysis.   To see the full list of attributes available in this service, go to the "Data" tab above, and then choose "Fields" at the top right. Each attribute contains definitions, additional details, and the formula for calculated fields in the field description.Vintage of boundaries and attributes: 2020 Demographic and Housing Characteristics Table(s): P1, H1, H3, P16, P16B, P16C, P16D, P16E, P16F, P16G, P16H, P16I, P19, P20, PCT5, PCT6, PCT14, PCT14B, PCT14C, PCT14D, PCT14E, PCT14F, PCT14G, PCT14H, PCT14I, PCT15, H14, H9, H12, H15 Data downloaded from: U.S. Census Bureau’s data.census.gov siteDate the Data was Downloaded: May 25, 2023Geography Levels included: Nation, Consolidated City, Census Designated Place, Incorporated PlaceNational Figures: included in Nation layer The United States Census Bureau Demographic and Housing Characteristics: 2020 Census Results 2020 Census Data Quality Geography & 2020 Census Technical Documentation Data Table Guide: includes the final list of tables, lowest level of geography by table and table shells for the Demographic Profile and Demographic and Housing Characteristics.News & Updates This layer is ready to be used in ArcGIS Pro, ArcGIS Online and its configurable apps, Story Maps, dashboards, Notebooks, Python, custom apps, and mobile apps. Data can also be exported for offline workflows. Please cite the U.S. Census Bureau when using this data. Data Processing Notes: These 2020 Census boundaries come from the US Census TIGER geodatabases. These are Census boundaries with water and/or coastlines erased for cartographic and mapping purposes. For Census tracts and block groups, the water cutouts are derived from a subset of the 2020 Areal Hydrography boundaries offered by TIGER. Water bodies and rivers which are 50 million square meters or larger (mid to large sized water bodies) are erased from the tract and block group boundaries, as well as additional important features. For state and county boundaries, the water and coastlines are derived from the coastlines of the 2020 500k TIGER Cartographic Boundary Shapefiles. These are erased to more accurately portray the coastlines and Great Lakes. The original AWATER and ALAND fields are unchanged and available as attributes within the data table (units are square meters).  The layer contains all US states, Washington D.C., and Puerto Rico. Census tracts with no population that occur in areas of water, such as oceans, are removed from this data service (Census Tracts beginning with 99). Block groups that fall within the same criteria (Block Group denoted as 0 with no area land) have also been removed.Percentages and derived counts, are calculated values (that can be identified by the "_calc_" stub in the field name). Field alias names were created based on the Table Shells file available from the Data Table Guide for the Demographic Profile and Demographic and Housing Characteristics. Not all lines of all tables listed above are included in this layer. Duplicative counts were dropped. For example, P0030001 was dropped, as it is duplicative of P0010001.To protect the privacy and confidentiality of respondents, their data has been protected using differential privacy techniques by the U.S. Census Bureau.

This table contains data on household income, broken down by region and various background characteristics of the household and of the main costwinner. The population consists of all private households with well-known incomes, from which student households of their choice can be excluded. Reference date for the population is 1 January of the reporting year, and reference date for the municipal classification is 1 January 2020.

Data available from 2011 to 2019.

Status of the figures:

The figures in this table for 2011 to 2018 are final. The figures for 2019 are provisional.

Changes as of 19 October 2021:

None, this table has been discontinued.

When are new figures coming?

No longer applicable.

Main tables from The Effects of Taxes and Benefits on Household Income publication for 1977 onwards.

This data product presents the latest household income forecast and estimates for U.S. family farms.

Data on living arrangements of persons in private households including stepfamily status and presence of grandparents, age group and gender, Canada, provinces and territories, census metropolitan areas and census agglomerations, 2021 and 2016 censuses.

This table contains data on household income, broken down by region and various background characteristics of the household and of the main breadwinner. The population consists of all private households with known income, where student households can be optionally excluded. The reference date for the population is January 1 of the year under review, and the reference date for the municipal subdivision is January 1, 2017. Data available from 2011 to 2015 inclusive. Status of the figures: The figures in this table are final. Changes as of November 12, 2018: No longer applicable. This table is followed by the table 'Income households; characteristics, region (2018 classification)'. See section 3. When will new figures be released? Not applicable anymore.

Household characteristics by tenure, for households with usual residents, England and Wales, Census 2021. Data are available at a national, country, region, local authority district, Middle layer Super Output Area and Lower layer Super Output Area level, where possible.

Household income statistics by structural type of dwelling (single-detached house, apartments, other attached dwelling) and household type (couple family, lone-parent family, non-census family households) for Canada, provinces and territories, census divisions and census subdivisions.

Household characteristics by type of household

Household characteristics by type of household

Distribution of household after-tax income in constant 2020 dollars by household type (couple family, one-parent family, non-census family households) and characteristics of household members (number of earners and number of people in different age groups).

This table contains results for households with a relatively low income. The results are broken down into household characteristics such as gender and age of the main breadwinner, and the household composition and main source of income of the household. Two income limits are used for the classification by level of income: the low-income limit and the policy minimum. For these classifications, the number of households is published, both in absolute terms and as a percentage of the total population. The table also contains data on the number of households that had to survive on an income below the used income threshold for a long period of time (4 years and more). The results are used, among other things, in reports on poverty. The data relate to all private households with income as at 1 January of the year under review. Student households and households that only had an income for part of the year were not taken into account. Data available from: 2011. Status of the figures: The figures for the years 2011 - 2020 are final. The figures for 2021 are provisional. Changes as of March 10, 2023: For the periods 2011 to 2013, the figures for Duration of income position: 4 years or longer have been supplemented. Changes as of December 2, 2022: Update with final figures for 2020 and provisional figures for 2021. When will new figures be released? The new figures will be available in December 2023.