I had the same problem. I used Food Grade Diatomacious Earth and they have not come back. They take it back to the nest and kill the entire colony.
Actually the ants do not take the diatomaceous earth back to the colony as Danielle states, however she has the right killer for the ants and most insects for that matter. It's non poisonous so it can't hurt you or your pets. Buy the food grade simply because you might want to actually use it for yourself or pets some day should they get arthritis or other problems. Yup, you can eat it. And people swear it takes all the inflammation out of their joints. You can buy it in Health Food stores or Google it on line. It never gets old because it is already almost as old as our planet. It is simply fossil remains of diatoms.
You don't need much, just a line where they travel.
You might find some YouTube videos on DE.
Here is a tutorial answers your question, it is safe, inexpensive and WORKS even on little red ants: https://www.hometalk.com/36651130/ants-safe-and-effective-cure?r=2
Vinagar kills them