The county tally (not yet verified) has been posted at the SBE website for the number of signatures received from MD Petitions last Thursday, June 30th. Go here to see what they have so far. You can click on the verification for May 31st or click on the summary of those delivered on June 30th—74,980!
Top counties are Baltimore, Anne Arundel and Harford. Less populace counties that beat Montgomery were Carroll, Frederick and Washington. Where were the Montgomery County Republicans?
Last time it was fun to see the counts as they came in daily, so visit the SBE website often!
Update: Scott S. has a very informative analysis of the numbers posted by Cecil Calvert, here.