Arkansas

organizations—there’s a national one—that will let you post the dogs with photos and full descriptions. You post by state and can post by breed.
You can try Facebook as there are many dog activists there. Google under dog rescue groups or again labradors. Some people volunteer to cross post dogs. Sometimes a group will even arrange transport.
The trick is to vet any responses, look up the groups. You should charge a rehoming fee particularly if they have up to date shots. If you don’t you could get a psycho, a person with no way to care for them, a backyard breeder, a dog fighter using them for bait.
Also check out any no-kill rescues, usually grassroots, locally.
Are they full grown? Puppies?
Your local animal care and control may or may not be a high kill shelter. Some make efforts to rehome through mobile adoptions and advertising, but many do not.
If you know the name of an animal care and control, see if Facebook lists a friends’ group for that shelter. They might help you promo the dogs.
Get pictures ready. Yes, you can use free classified ads, but charge a fee. I can look for and give you the names of some registries. They post for free. Craigslist can be iffy, but with proper vetting and stipulating a charge, some good homes can be found. If you can send me photos and descriptions I can post on my page. I have many contacts, but of course, they are trying to place dogs too. Do up flyers. You can find free places with templates online.
It is work, I know. I can try to help in the promoting. You can message me. Any neighborhood newsletters? You can sign up free and post there online. I live in Northern CA. I used to post and promo dogs and help rehome.