The @cityofdenver Instagram account boasts hundreds of photos of Denver's skyline, popular landmarks and Colorado's natural landscape.
The account has 150,000 followers, and posted photos generally receive thousands of likes.
But the official city of Denver doesn't know who's running the account.
According to KUSA, an unknown person or group has been "squatting" on the account name for years.
Jenny Schiavone, who works for Denver's marketing department, said city officials have tried unsuccessfully for "a while" to find out who's operating the account.
The account, which can easily be mistaken as an official one, also links to a cityofdenver.us website, where the official city of Denver logo is posted.
But Schiavone said no one from the city has made a complaint to Instagram.
"We haven't asked them to give it up, since they had it first, and they really do have fabulous content, but we've asked them not to use our website and logo," Schiavone said.
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