The Sanders County Commissioners Office reports there have been three confirmed COVID-19 cases.
This marks the first three confirmed cases in Sanders County residents.
The State of Montana confirmed the test results on Monday.
Sanders County Public Health staff have initiated contact tracing procedures.
Another Montana county that had previously not seen any COVID-19 cases -- Sweet Grass -- reported its first case on Tuesday morning.
A dozen Montana counties had not recorded a confirmed VODI-19 case as of Tuesday.