Goodwill's 65 North Georgia stores closed on March 23 and they stopped taking donations on April 19, she said.
When the remaining stores reopened the next week, Goodwill asked people to hold onto their donations to give shoppers time to buy the excess inventory.
They started taking donations again on May 18, Hawkins said.
"There were literally several of our properties ... where there were lines around the building, around the property, with folks wanting to drop things off," she said.
Only about a quarter of the stores are currently operating.
Maj. Gary Wilson, who oversees the stores in the Salvation Army's southern territory, told CNN that the money from the stores pays for its addiction recovery programs that have still been going on during the pandemic.
"I don't know if folks really realize how important these stores are to us," he said.
Spring is typically their biggest time of year for donations and many local administrators were able to keep doing collections while their stores were closed.
"The different centers had to be rather innovative and start figuring out how they could store these properly," Wilson said. Some rented trailers or had warehouses to handle the overflow.
Focus on safety
Both organizations said they are doing everything they can to limit contact during the donation process.
People who drive up don't even have to get out of their cars -- they just pop open their trunk and workers in personal protective equipment collect the donations and leave a receipt.
The Salvation Army also has a contact-free pickup, so people can arrange to just leave their donations on their porch.
That service has been pretty popular, Wilson said, adding that a few areas in his territory -- which runs from Maryland and West Virginia, down to Florida and west to Oklahoma and Texas -- are seeing donation levels that are approaching normal levels at the stores that are open.
"It seems like whatever we're opening, folks are really coming out and supporting us and I hope in return, they're also getting the good deals they were looking for to help them through this tough time also," Wilson said.
Once the donations are collected workers put them aside and no one touches them for at least 24 hours to reduce the risk of contact with any virus that might be on the surfaces. Then the donations are cleaned and sanitized before they're put out on the sales floor.
Hawkins said Goodwill workers have increased cleaning in their stores and have used an eco-friendly mist to treat merchandise and surfaces.
"We're constantly cleaning those high touch areas, wiping things down and making sure that folks are safe and that our merchandise is safe," she said.