harford county is in region B. I am assuming you are asking about that county.

Region B:
rifle or shotgun: you are allowed 10antlerless and 2antlered You must take 2 antlerless before taking 2nd antlered.
Muzzleloader: same as above 10 antlerless and 2 antlered

But check your dates in the guide or on website above. some days your only allowed to take antlerless deer.

Go to that site and on the left click hunting.