Mason, who was elected sheriff in November, was sworn in by Clerk of Court Stephen Hales as Mason's family, sheriff's deputies and a crowd of supporters watched.
"It's an honor to be in front of you," Mason said. "This is a special day for me and my family."
Mason -- a 28-year veteran of the Sheriff's Office who most recently served as chief deputy -- defeated Democratic candidate Bobby Brittingham in last month's election to take over as head of county law enforcement for Charles Martin, who chose not to run for re-election. Mason thanked Martin, who has held the post for 12 years, and said he hoped his health improved so he could do some traveling in his retirement. In January, Martin publicly disclosed he has Lyme disease and cited that as a reason he wouldn't run again.
Mason, a Republican, thanked his array of supporters, many of whom were in the crowded quarters, as well as those who taught him about police work. He said being elected sheriff meant a lot to him, especially since he lost a sister and his father-in-law during the campaign.
He assured those present that he would continue to ride the county's roads day and night.
"I will continue to make Worcester County safe," he said.
In light of recent fatal accidents on Route 113 in Worcester, Mason said the road's safety would be one of his priorities.
"We've got to do something about 113," he said. "The Worcester County Sheriff's Office will be involved."
Following Mason's installment as sheriff, John Dale Smack III was sworn in as chief deputy of the Sheriff's Office. He said he was looking forward to the opportunity.
"I will do the best I can for you," he said.