Mike Johnston took the oath of office to become Denver’s 46th mayor at the Ellie Caulkins Opera House in Denver on Monday morning, July 17, 2023. Related Articles Politics | Mike Johnston sworn in as Denver mayor Politics | Denver Mayor Michael Hancock leaves behind accomplishments — and plenty of frustration — after 12 years in charge Politics | Mike Johnston hires chief of staff as he prepares to take over Denver mayor’s office Politics | Denver scrubbed its $40 million migrant crisis plan.