Munson, a retired postmaster, served on the Washington County Board of Commissioners from 2002-06.
He said his goal in seeking the House of Delegates seat was to bring more state money to Washington County. "If they don't spend it here, they're going to spend it someplace else," he said.
Jones, 45, of Williamsport, has been a legislative aide for Shank for the past six years.
"I know the process, so I look at this as a good opportunity to be able to move forward," she said.
Jones, a 1980 graduate of St. Maria Goretti High School, has worked in accounting and was active in the PTA at her daughters' school.
Armstrong, 42, who lives north of Hagerstown, was not available Thursday evening, but his wife, Kimmy Armstrong, confirmed he mailed in an application for the position.
In his application letter, Armstrong stressed the importance of fiscal responsibility, affordable health care and funding for education.
Armstrong, a former Maryland State Police employee and the uncle of slain Smithsburg Police Officer Christopher S. Nicholson, said he also hoped to address public safety and violent crime.
McKee, a Republican, represented Subdistrict 2A, which runs west from Cascade and Smithsburg, along the northern part of Washington County, and wraps around Hagerstown as it stretches south to Williamsport.
He announced his resignation Friday in the wake of a police investigation into possible child pornography at his home in Halfway. He held the House of Delegates seat for 13 years.
In Maryland, the central committee in the home county of the delegate or senator vacating the seat recommends a replacement.
The central committee has 30 days to make a recommendation to the governor. The governor then has 15 days to appoint someone.