Boulder is the county seat and most populous city of Boulder County and the 11th most populous city in the U.S. state of Colorado. Boulder is located at the base of the foothills of the Rocky Mountains at an elevation of 5,430 feet. The city is 25 miles northwest of Denver. Wikipedia

Sunnyvale, officially the City of Sunnyvale, is a city located in Santa Clara County, California. As of the 2010 United States Census, the population was 140,095. The city is one of the major cities that make up the Silicon Valley located in the San Francisco Bay Area. Wikipedia