Deputies arrived at Easterday Farms after a worker discovered the first two bodies around 5 a.m. on farmland southeast of Nine Canyon Road and Coffin Road. The third body was discovered by deputies, Lieutenant Chuck Jones said.
The bodies have not been identified, and it was not known how they died.
"We're so early into the investigation, we really have a lot of work to do," said Lt. Jones.
Investigators told KEPR News that it could be days for a full investigation to take place.
Workers in the area say they're frightened, and hope to have answers soon.
"We feel curious, we feel scared, we feel nervous, we feel worried," said Eugenia Lopez.
Lopez works with her daughter at Easterday Farms, and arrived at 5 a.m. to find police swarming the area. Lopez worries whose bodies were found, and that the person responsible is working with them on the same farm.
"I asked if they were working here, or who they are, and the guy says, 'Well we don't know exactly who (it is),'" Lopez said. "They're going to find out, but they don't know why the bodies are here, and they don't know if they were working here too."
Benton County Coroner John Hansens says the names of the victims were not being released because family has yet to be notified.
Hansens says an autopsy is scheduled for Monday morning.