Jacobs found that he could calculate total crowd size by dividing spaces into ... estimating 1.8 million attendees at Obama's first inauguration. In the absence of an official source, multiple ...

Although the National Park Service does not make crowd ... on Inauguration Day in 2017 prior to 11 a.m. was 193,000 trips. By comparison, there were 317,000 rides as of 11 a.m. during Obama's ...