The Crowd Counting Consortium (CCC) collects publicly available data on political crowds reported in the United States, including marches, protests, strikes, demonstrations, riots, and other actions.

The CCC emerged out of a collaborative effort by Jeremy Pressman and Erica Chenoweth to provide an accurate estimate of the number of people who participated in the Women's March on Washington (and its affiliated Sister Marchers worldwide) on January 21st, 2017. Several of their colleagues expressed an interest in conducting similar kinds of efforts. Upon recognizing the growing public interest in up-to-date information on crowds -- and in response to requests to continue the effort beyond the Women's March -- they and their volunteer colleagues established the CCC. On April 22, 2017, the CCC began to collaborate with countlove.org, another volunteer group that developed a webcrawler that captures events data from local newspaper and television sites on a daily basis.

We are collecting this data in the public interest and to further scholarly research. We are not formally affiliated with any other efforts to collect data on demonstrations, though we have worked with countlove.org. Anyone who wishes to conduct research using the data is fully responsible for any necessary contact with their own Institutional Review Boards. If you wish to use these data, please include a citation to the “Crowd Counting Consortium.”

Read more about the origins of the project here.

Read Erica and Jeremy's Washington Post article about what they learned from counting the women's march (and why they'll keep counting). For a time, monthly update posts appeared as a series at The Monkey Cage.

Follow us @CrowdCounting.