Through closed-circuit TV cameras, the room where it's happening is viewable to the public.
Observers from both parties have also been overseeing the process.
By late afternoon former Vice President Joe Biden was leading President Trump by more than 8,300 votes.
State results showing Biden with a substantial lead over Trump in mail-in and absentee ballots in Bucks County.
More than 130,000 of those ballots been counted so far.
By midday election officials reporting some 28,000 mail-in and absentee ballots left to count.
The overall number increasing by about 7,000 ballots as mail arrived and dropbox ballots began being processed.
"We're very very close to the finish line," said chairman of the county's election board Commissioner Bob Harvie.
Harvie said now it's a matter of sorting out those ballots that arrived after Election Day, provisional and ballots that could be contested later.
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As long as there is no clear indication mail-in ballots were mailed after the polls closed on Election Day they can be counted, at least for now.
"It's really getting into the weeds at this point, the minutiae of all sorts of things and that's why I'm saying not really going to be finished until that process is done," Harvie said.
Demonstrators with the Count Every Vote movement say they are willing to wait for it.
They staged a march outside the Elections Board office.
"It is a completely non-partisan issue. It is an American issue. We all have a vote and the vote needs to be counted," said Kierstyn Zolfo, Indivisible Bucks County.