Glass, 37, a Silver Spring activist and former CNN producer, trailed Hucker by 217 votes on primary night and said he would wait until absentee and provisional ballots were counted before making an announcement.
Hucker extended his lead slightly in last week’s first round of absentee-ballot counts. Glass won a slight plurality of the provisional ballots — cast by voters who went to the polls in the wrong precinct or had identification problems — but could not close the gap.
A small number of absentee ballots were left to count when Glass e-mailed supporters Thursday to say he had called Hucker to offer his congratulations.
“I applaud Tom and all the candidates, as each ran a good campaign and collectively helped elevate the conversation about how to tackle our community’s challenges,” Glass wrote. “Now is the time for us all to work together.”
The final ballots were tallied Monday morning. Hucker finished ahead by 222 votes out of 19,971 cast.
During the campaign, Glass contended that he was the candidate most familiar with issues on the ground in District 5, which encompasses Silver Spring and a swath of the eastern county from Takoma Park to Burtonsville.
Hucker, 47, a two-term Maryland delegate, said his legislative experience would give constituents an edge in dealings with the state government in Annapolis and in passing legislation on the County Council.
Three other candidates, Board of Education member Christopher Barclay, Takoma Park activist Terrill North and nonprofit founder Jeffrey Thames, trailed far behind.
Hucker faces no Republican opposition in the November general election.