In this research note, we introduce and describe the collection of data on mask mandates in the United States. We detail the collection protocol as well as tools for accessing the data and offering feedback on amendments to the data. We present introductory visualization of the data. This project is part of a continuing effort to collect vital information about public policy interventions during the COVID-19 pandemic.

More on this topic

BFI Working Paper·Mar 10, 2026

Work from Home and Fertility

Cevat Giray Aksoy, Jose Maria Barrero, Nicholas Bloom, Katelyn Cranney, Steven J. Davis, Mathias Dolls, and Pablo Zarate
Topics: COVID-19, Health care, Technology & Innovation
BFI Working Paper·Mar 10, 2025

The Curious Surge of Productivity in U.S. Restaurants

Austan Goolsbee, Chad Syverson, Rebecca Goldgof, and Joe Tatarka
Topics: COVID-19, Employment & Wages, Industrial Organization
BFI Working Paper·Feb 10, 2025

Policy Interventions and China’s Stock Market in the Early Stages of the COVID-19 Pandemic

Steven Davis, Dingqian Liu, Xuguang Simon Sheng, and Yan Wang
Topics: COVID-19, Financial Markets