2 Sep 2025

FEMA Flood Hazard Zones

The Flood Hazard Zones are extracted from the National Flood Hazard Layer, which is a database that contains FEMA’s flood hazard map data. The database contains flood hazard information and supporting data used to develop the information. The primary flood hazard classification is indicated in the Flood Hazard Zones layer.

Flood zones are geographic areas that FEMA has defined according to varying levels of flood risk and type of flooding. For complete information about different flood zone designations, please visit the Definitions of FEMA Flood Zones web page.

Flood Hazard Zone Descriptions:
  Floodway: The stream channel and that portion of the adjacent floodplain which must remain open to permit passage of the base flood.
  1% Annual Chance Flood Zone: The 100-year or base floodplain.
  0.2% Annual Chance Flood Zone: Area of moderate flood hazard, usually the area between the limits of the 100-year and 500-year floodplains, but also shallow flooding areas (< 1 foot) or flood zones for small drainage areas (< 1 square mile).
  Area with Reduced Risk Due to Levee: Areas protected by levees from the 100-year flood.
  1% Annual Chance Future Considerations: The 100-year floodplain based on anticipated future land-use conditions.
  Area of Undetermined Hazard: Area of undetermined but possible flood hazard, typically occurring in counties with partial flood studies.

This information was acquired by state-level release February, 2020. Data release dates by state range from December 07, 2016 (Vermont) to February 12, 2020 (Utah).

2 Sep 2025

School Shootings

This layer displays the location of school shootings across the country. Shootings are categorized by the situation and the size varies by the number of victims.

2 Sep 2025

Preventable Hospitalization by County, 2019

This layer displays the total number and rate of preventable hospitalization events among Medicare beneficiaries. Preventable hospitalizations include hospital admissions for one or more of the following conditions: diabetes with short-term complications, diabetes with long-term complications, uncontrolled diabetes without complications, diabetes with lower-extremity amputation, chronic obstructive pulmonary disease, asthma, hypertension, heart failure, bacterial pneumonia, or urinary tract infection. Rates are presented per 100,000 beneficiaries.

2 Sep 2025

Socioeconomic Status Vulnerability

The Centers for Disease Control and Prevention (CDC), Agency for Toxic Substances and Disease Registry (ATSDR) Social Vulnerability Index (SVI), or CDC/ATSDR SVI, is a database that helps emergency response planners and public health officials identify, map, and plan support for communities that will most likely need support before, during, and after a public health emergency.
CDC/ATSDR and the HHS Office of Minority Health developed the Minority Health Social Vulnerability Index (Minority Health SVI) to enhance existing resources to support the identification of racial and ethnic minority communities at the greatest risk for disproportionate impact and adverse outcomes due to the COVID-19 pandemic.
The Minority Health SVI is an extension of the CDC/ATSDR SVI that includes additional variables for race, ethnicity, language, medical vulnerability, and health care infrastructure. The Minority Health SVI is grouped into six themes: Socioeconomic Status, Household Composition and Disability, Minority Status and Language, Housing Type and Transportation, Health Care Infrastructure, and Medical Vulnerability. Each theme has a percentile ranking represented as a value between 0 (least vulnerable) and 1 (most vulnerable). An Overall Percentile Ranking combines these themes. For more information visit the Social Vulnerability Index website .

2 Sep 2025

Income from Transfer Payments

Layer displays information about personal income from transfer payments from the Bureau of Economic Analysis (BEA) Local Area Personal Income data series. In personal income, transfer receipts are benefits received by persons for which no current services are performed. They are payments by government and business to individuals and non-profit institutions. Specifically, transfer payment income encompasses all receipts from:

  • Retirement and disability;
  • Medical benefits;
  • Income maintenance benefits (SSI, EITC, SNAP, etc.);
  • Unemployment;
  • Veterans’ benefits;
  • Education and training assistance;
  • Other government benefits;
  • Payments from businesses

For more information, please see the Local Area Personal Income Methodology.

2 Sep 2025

Business Vacancies – 2020 Q4

This layer displays business vacancy rates and total business vacancies in census tracts across the United States. Vacancy rates are reported quarterly.