If you are looking to buy/sell in Carroll/Frederick Counties, then I have the perfect realtor for you. I have used her twice and she has is the most dedicated, hardest working person I have ever met.
Her name is Jane Sharp and she works with Caldwell Banker. She has been in the business for more than 40 years. She is a die hard conservative and and pro 2A.
Give her a call on her cell. She will give you the royal treatment.
I would recommend Kathy Dixon of the Dixon/Kluge group. They are right by Klee Mill Rd, and have several very experienced agents in all the geographical areas you listed.
As a former Realtor having worked with Kathy and Patti, I can attest to them being incredible at their trade. Kathy's # is 443-745-7351.
When its time for me to buy and sell again, they are who I will call.
Megarms recommendation of Jane Sharp is good as well. I worked with her too.