[Answer] Time in the United States is officially determined by an atomic clock in which city?

Step 1 : Introduction to the question "Time in the United States is officially determined by an atomic clock in which city?"

...The United States' official time is determined by an atomic clock maintained by the National Institute of Standards and Technology in Boulder, Colorado. This atomic clock, known for its incredible precision, serves as the foundation for Coordinated Universal Time (UTC) in the United States. Operational since 1999, this atomic clock measures frequency using a fountain-like movement of cesium atoms, achieving unmatched accuracy. Boulder was chosen for its scientific community and stable environmental conditions, making it an ideal location for the world’s most advanced timekeeping technology.

Step 2 : Answer to the question "Time in the United States is officially determined by an atomic clock in which city?"

Boulder, Colorado:

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