The individuals that haven't been accounted for in the deadly storm have been registered on the Bahamian government's missing persons registry, Carl Smith, a spokesman for the Bahamian National Emergency Management Agency, said at a news conference on Wednesday.
Officials are hopeful that many of those registered as unaccounted for will eventually surface as survivors, Smith added.
On Wednesday, Bahamian officials said 2,500 people were listed on the registry. But as officials began to check the list against government records of people staying in shelters or who have been evacuated, they dramatically reduced the list by 1,200 names.
He said the whereabouts of some survivors remains unknown because the power and communication infrastructure in the hard-hit Abaco Islands -- including a power station at Marsh Harbour that was "completely destroyed" -- has been obliterated.
Dorian slammed the Bahamas as a monster Category 5 hurricane, tying the record for the strongest Atlantic hurricane ever to make landfall.
The hurricane left about 76,000 people homeless and in need of assistance in the Abaco Islands and Grand Bahama Island, where entire neighborhoods were leveled by the storm's 183 mph winds, according to the United Nations.
Food, clean water, shelter, health and sanitation services are in critical need in the aftermath of the hurricane, officials said. Businesses and celebrities are making commitments to assist the Bahamas, and organizations are asking the public to help with the relief efforts.
Reigning Masters golf champion Tiger Woods and singer Justin Timberlake are the latest celebrities to join the relief effort.
Woods tweeted on Thursday that he and Timberlake are partnering with pro golfer Ernie Eles, the international hospitality real estate development company Nexus Luxury Collection, and the luxury resort community The Albany, Bahamas, to establish the ONE Bahamas Fund with $6 million and challenged others to donate and help reach a goal of $12 million.
NBA legend Michael Jordan pledged $1 million to help islanders recover from the hurricane.
"I am devastated to see the destruction that Hurricane Dorian has brought to the Bahamas, where I own property and visit frequently," Jordan said in a statement posted on Twitter on Wednesday by his manager, Estee Portnoy. "My heart goes out to everyone who is suffering and to those who have lost loved ones."
Other celebrities and entrepreneurs such as Rihanna, who hails from the Caribbean island nation of Barbados, and Richard Branson, who owns a home in the Bahamas, have also pledged to help in the recovery.
Relief organizations, including the Red Cross and Mercy Crops, have sent teams and supplies to the Bahamas.
"Over the past several days, I’ve seen firsthand the devastation Dorian has caused on Abaco Islands and Grand Bahama, the two most affected areas. Roads, airports and houses are destroyed and thousands of people have been left without power and with few possessions," Christy Delafield, spokesperson for Mercy Corps, told ABC News.
Delafield said Mercy Corps has been distributing solar lanterns equipped with USB chargers, mosquito nets, tarps and other emergency supplies to survivors, many who lost their homes and all their belongings in the hurricane.
Also helping is 19-year-old pilot Andi Million of Naples, Florida, who along with her flight instructor at the Career Flight Training and Aircraft Rental, flew a plane full of pet supplies and other emergency items to the Abaco Islands on Tuesday.
"It’s hard not to be overwhelmed by the desire to help more and give absolutely everything you have on you at that time," Million wrote in a Facebook post on Wednesday.
Smith said that more than 5,500 people have been evacuated from the Abaco Island and Grand Bahama to New Providence, the most populated Bahamian island, which includes the capital Nassau. He said several thousand people have also been evacuated to the United States.
ABC News' Samara Lynn contributed to this report.