NSSP Participation and Coverage


The map below shows participation in NSSP as of March 31, 2020, with 59 sites (47 states and the District of Columbia).

Participation Map

Definitions: NSSP consolidates facilities that provide data under a single data administrative authority called a site administrator. These facilities and single-site administrator constitute a site.



NSSP data covers about 73% of all emergency department visits in the United States.

NSSP publishes data for emergency department (ED) visit coverage each quarter. As of June 30, 2020, data from EDs covered about 73% of all ED visits in the country. There were 5,292 facilities, including 3,530 EDs from 59 sites (47 states and the District of Columbia), actively contributing data to the NSSP BioSense Platform. For detailed information on our calculations for estimating ED coverage, please visit this page.

Page last reviewed: August 12, 2020