While a concept artist can average a salary of $74,663 per year, or $35.9 per hour, there are many opportunities for concept artists to make more. For example, in Bellevue, WA you might make $96,416 per year. Other high-paying locations include Mesa, AZ, Novato, CA, and Dallas, TX.
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The Creative Group puts together a salary guide every year for those in creative careers. You can probably find the information you are looking for here: https://www.roberthalf.com/creativegroup/salary-center-for-creative-and-marketing-professionals.