More people were found to have been affected by the virus, which is known to cause stomach pain and diarrhea.
Currently, 47 patients are quarantined, while 147 others have recovered and returned to work.
None of the Olympic athletes were infected by the virus, the committee noted.
The organizing committee earlier said in a statement that a survey of tap water, food staff and food items is under way to trace the route of transmission.
According to the Korean Center for Disease Control and Prevention, norovirus has been found in 94 people linked to the Horeb Odaesan Youth Training Center, including those who ate food from the center but don’t live there.
Analysis of the center’s water discovered fecal coliform bacteria.
After the training center stopped providing meals, requested frequent hand washing and promoted the use of hand sanitizer, “the norovirus infection reduced considerably,” the KCDC said in a statement.
The illness has spread from the Pyeongchang area to Gangneung, the coastal city hosting several indoor events at the Games.
No athletes are known to have been infected.
A day earlier, 158 people infected by norovirus were reported.