ESA Overview

Since 1973, over 2,000 species have been listed as 'Threatened' or 'Endangered' under the Endangered Species Act (ESA). The Fish and Wildlife Service (FWS) provides a detailed description of the listing process. Below, you can explore the number of domestic listed species by year as of

1228

Endangered Species

375

Threatened Species

30

Candidate Species

68

Proposed for Listing

Timeline of Listings

This chart tracks the number of species listings over time.


Click on a timepoint to see the species listed in a particular category that year.

Listings by Taxonomic Group

The bar chart breaks down the number of listed species by taxon and listing status.

The treemap organizes this information hierarchically, and can be used to visualize the breakdown of taxa within specific FWS Regional Offices. Box sizes correspond to the number of listed species.


Click here for instructions.

Listings by Region

The bar chart breaks down the number of listed species by FWS Regional Offices and listing status.

The treemap organizes this information hierarchically to visualize how listings for specific taxa are distributed among FWS Regional Offices. Box sizes correspond to the number of listed species.


Click here for instructions.

Geography of Listings

This map shows the number of listed species in each U.S. county based on data from the U.S. Fish and Wildlife Service. It can be used to identify 'hot spots' - areas with a high concentration of listed species - such as southern California.


Distributions of Listed Species

The majority of listed species occupy limited ranges. The top graph illustrates the distribution of listed species' range sizes, in terms of the number of U.S. counties in which they occur.


Similarly, most counties have few listed species, although this distribution is less skewed than the sizes of species' ranges. In 75% of U.S. counties, there are 8 or fewer listed species.