One can link the UAS Covid-19 Survey National Sample Longitudinal File to a set of external datasources. These include the following:

The COVID Tracking Project

The COVID Tracking Project is a volunteer organization launched from The Atlantic and dedicated to collecting and publishing the data required to understand the COVID-19 outbreak in the United States. Every day, they collect data on COVID-19 testing and patient outcomes from all 50 states, 5 territories, and the District of Columbia. Their dataset is currently in use by national and local news organizations across the US and by research projects and agencies worldwide.


Researchers at the Boston University School of Public Health have compiled data on new and existing state health and economic policies relevant to responding to COVID-19. The database includes information on the dates of physical distancing policies, reopening policies, mask policies, unemployment policies, housing policies, SNAP benefits, and health insurance and telehealth policies. Policy sources are also publicly available to inform coding of additional policy details:

New York Times

The New York Times is releasing a series of data files with cumulative counts of coronavirus cases in the United States, at the state and county level, over time. They are compiling this time series data from state and local governments and health departments in an attempt to provide a complete record of the ongoing outbreak. Since late January, The Times has tracked cases of coronavirus in real time as they were identified after testing. Because of the widespread shortage of testing, however, the data is necessarily limited in the picture it presents of the outbreak.


IHME's COVID-19 projections were developed in response to requests from the University of Washington School of Medicine and other US hospital systems and state governments working to determine when COVID-19 would overwhelm their ability to care for patients. The forecasts show demand for hospital services, daily and cumulative deaths due to COVID-19, rates of infection and testing, and the impact of social distancing, organized by country and state

Opportunity Insights

The Opportunity Insights Economic Tracker combines anonymized data from leading private companies – from credit card processors to payroll firms – to provide a real-time picture of indicators such as employment rates, consumer spending, and job postings across counties, industries, and income groups.

In collaboration with their data partners, they are making this data freely available in order to assist in efforts to inform the public, policymakers, and researchers about the real-time state of the economy and the effects of COVID-19.

Included in our contextual data:

Link to the UAS

We have already linked parts of these data that we consider useful to the respondent ids in the UAS, so that merging of the external data with the longitudinal file only requires a simple merge. The access to the linked external data may require the signing of an additional sensitive data addendum to the data user agreement that was signed upon registration with the UAS. Whether a sensitive data addendum needs to be signed is indicated for each of the datasets listed below. Non-sensitive data can be downloaded directly and linked to the UAS longitudinal datasets on your own computer. For sensitive data we ask that, after we have accepted your signed sensitive data addendum, you let us know which external data you are interested in and we will give you access to the linked file.

It is possible that you would want to link to other parts of the datasets listed above. In that case, we will be happy to provide you with a customized linked dataset, but we need to charge for the cost of that activity. If you have special requirements for the data you need, please get in touch with us by emailing to and we will inform you about feasibility and costs.

DATA ON STATE LEVEL (no sensitive data addendum required)

DATA ON COUNTY LEVEL (sensitive data addendum required)