In the United States polling showed that an estimated 90,000,000 Americans participated in Earth Hour as lights were turned off around the country, including landmarks such as Mount Rushmore, the Las Vegas Strip, the Empire State Building and Niagara Falls.
Di Amerika Serikat, survei menunjukkan bahwa sekitar 90.000.000 warga Amerika Serikat berpartisipasi dalam Earth Hour ketika lampu dipadamkan di seluruh negara ini, termasuk markah tanah seperti Mount Rushmore, Las Vegas Strip, Empire State Building dan Air Terjun Niagara.