Reply(1) Jefferson County's mask order has been updated to align with the statewide mask order, officials announced Wednesday. (Shutterstock) JEFFERSON COUNTY, CO — Jefferson County updated its mask order Wednesday to allow small, vaccinated groups to gather in low-risk settings without covering their faces. The updated order will remain in effect until June 6. Changes to the mask order include: Masks are required in public indoor settings where 10 or more unvaccinated people or people of unknown vaccination status are present. Masking is not required in indoor public spaces if 80 percent or more of the people present are fully vaccinated (two full weeks after obtaining all required doses of a vaccine) and can provide proof of vaccination.