Nearly 37.8 million Americans watching at home viewed President Barack Obama’s oath of office and inaugural speech between the hours of 10:00 a.m. and 5:00 p.m. ET on January 20, 2009. This is the most viewed inauguration since the record of 41.8 million viewers who watched Ronald Reagan’s 1981 inauguration.

This is the first inaugural since Nielsen began tracking time-shifted viewing, and this year’s data is based on Live + Same Day, meaning incremental viewing during the same broadcast day is included.

Download the complete report.

President Date HH Rating Households Viewers P2+ Barack Obama January 20, 2009 -Tues 25.5 28,906,061 37,793,008 Ronald Reagan January 20, 1981-Tue 37.4 29,100,000 41,800,260 Richard Nixon January 20, 1969 – Mon 33.5 18,870,000 27,007,700 Jimmy Carter January 20, 1977-Thu 31.5 22,430,000 34,127,090 Richard Nixon January 20, 1973-Sat 28.5 18,470,000 32,950,900 Bill Clinton January 20, 1993-Wed 24.5 22,758,111 29,721,041 Ronald Reagan January 20, 1985-Sun 22.3 18,925,556 25,053,886 George W. Bush January 20, 2001-Sat 20.8 21,346,400 29,008,200 George H.W. Bush January 20, 1989-Fri 20 18,106,000 23,316,325 Bill Clinton January 20, 1997-Mon 17.1 16,515,000 21,583,000 George W. Bush January 20, 2005-Thu 11.8 12,928,709 15,536,652

RELATED: Nielsen Online traffic data for News, Current Event, and Video Streaming on Inauguration Day.