"Mermaids -- those half-human, half-fish sirens of the sea -- are legendary sea creatures," read the online statement from the National Ocean Service (NOS).
The agency, charged with responding to natural hazards, received letters inquiring about the existence of the sea maidens after the Discovery Channel's Animal Planet network broadcast "Mermaids: The Body Found" in May.
The show "paints a wildly convincing picture of the existence of mermaids, what they may look like, and why they've stayed hidden... until now," a Discovery Channel press release says.
Conversely, the US government declaration offered no conclusive proof to deny the existence of mermaids.
The statement comes after another government agency, this time the US Centers for Disease Control and Prevention (CDC), declared there was no conclusive evidence for the existence of zombies.