Barrow has won 36 of the 41 constituencies announced so far from Saturday's vote. Twelve more remain to be announced, Reuters reports.
Gambia President Adama Barrow is on course for a resounding election win, partial results from the election commission showed on Sunday.
Barrow has won 36 of the 41 constituencies announced so far from Saturday's vote. Twelve more remain to be announced, Reuters reports.
Counting has been underway since Saturday after Gambians voted in the first presidential election in the tiny West African nation since former dictator Yahya Jammeh fled into exile.
Voting finished at 5:00 pm (1700 GMT).
The election is being closely watched as a test of the democratic transition in The Gambia, where Jammeh ruled for 22 years after seizing power in a bloodless coup in 1994.
The ex-autocrat was forced into exile in Equatorial Guinea in January 2017 after Adama Barrow, then a relative unknown, defeated him at the ballot box.
President Barrow, 56, is now running for re-election, and faces five other candidates.
As he voted near the presidential palace, he predicted "the biggest landslide victory in the history of this country," saying "in the next 24 hours my people will be celebrating in the streets".
Polls opened at 0800 GMT, with long lines forming well before dawn in the capital Banjul.
Nearly 500 people lined up around the block at a market in the Banjul neighbourhood of Manjai Kunda, ready for hours of waiting.
"I expect that people vote peacefully," said voter Alice Jarjue, 27.
"Gambia is a peaceful country and we should maintain it that way. If another one (than your candidate) wins, you should respect that."
Babacar Diallo, 48, lined up early to vote.
"It is a very important to vote because we want change," he said. "The times have been hard, the economy is bad."
Many voters in the nation of more than two million people are hoping for an improvement in their living standards.
The Gambia, a sliver of land about 480 kilometres (300 miles) long, which is surrounded by Senegal, is one of the poorest countries in the world.
About half of the population live on less than $1.90 per day, the World Bank says.
The tourism-dependent economy in the former British colony was also dealt a severe blow by the Covid-19 pandemic.
Barrow is running on a continuity ticket, pointing to infrastructure projects completed under his watch, as well as increased civil liberties.
Political veteran Ousainou Darboe is considered by observers to be the leading opposition candidate.
Speaking as he voted in Serekunda, near Banjul, Darboe thanked God, saying "he has given me the strength to conduct my country".
The 73-year-old is a lawyer who has represented opponents of Jammeh, and who ran for president against the former dictator several times.
He also served as foreign minister and then vice president under Barrow, before stepping down in 2019.
Each candidate has their own ballot box at Gambian polls, and voters choose their preferred politician by dropping a marble inside one of the boxes.
The unusual voting method is because of low literacy rates in the country.
Questions over Jammeh's continuing role in politics, and his possible return from exile, have been central themes in the run-up to the election.
The 56-year-old former dictator has also sought to influence the vote, remotely addressing rallies of supporters during the campaign period, FRANCE24 reports.
Jammeh retains significant political support in The Gambia.
Another political camp, however, is pushing for criminal charges against Jammeh for alleged abuses committed under his rule.
Barrow set up a truth commission to probe the alleged abuses after coming to office.
Before hearings ended in May, it heard testimony from hundreds of witnesses about state-sanctioned death squads, witch hunts and forcing bogus cures on AIDS patients.
The commission recommended in November the government pursue criminal charges, in a final report delivered to Barrow but not released to the public.
The names of the officials against whom charges were recommended were also not released.
Criminal charges are politically sensitive given Jammeh's following.