Images posted on social media showed cars being swept along narrow streets by torrents of water.
Muddy waters rushed down roads, houses were flooded and vehicles piled up on top of each other after the Mediterranean island was pounded with rain in just a few hours, video footage showed.
Soldiers used shovels to clear the thick mud from the streets of the town, 60 kilometres (40 miles) east of the island's capital of Palma.
At least another 12 people were still missing after the downpours, local media reported, though emergency services declined to confirm that figure.
One male victim's identity has yet to be confirmed, although authorities believe he was not Spanish.
In an emailed statement, the British government's Foreign Office said: "We are supporting the family of two British people following their deaths in Spain, and will do all we can to assist them at this deeply hard time".
WITH the death toll following the flash flooding in Mallorca already standing at ten, emergency services are concentrating their efforts to find a child and two Germans who are still unaccounted for.
Prosecutors Drop Charge Against Harvey Weinstein From 1 of 3 Accusers
Rather, "it only speaks volumes about the Manhattan D.A.'s office and its mishandling of my client's case". Weinstein's lawyer, Benjamin Brafman, told the judge he believed Evans lied to the grand jury.
Spanish tennis star Nadal, 32, was pictured wearing boots and white gloves, mopping up the floor of a warehouse on Wednesday on the island where he lives. The biggest numbers came from Germany and Britain.
The missing child had been in a vehicle in Sant Llorenc with his mother, who was one of those killed, a spokesman for the central government's representative in the Balearic Islands said. I express my honest condolences to the relatives of the deceased and injured by the serious floods, " Nadal wrote on Twitter on Wednesday.
Other victims were found in Arta and the coastal village of S'illot, where the creek that overflowed reaches the sea.
The flooding forced schools to close and displaced people to shelter in sports halls.
Spanish PM Pedro Sanchez called news of the flooding "devastating" as he visited the area on Wednesday.
The Spanish parliament held a tribute to the victims in the form of a minute's silence. The regional government of the Balearic Islands declared three days of mourning.