There are of course highly qualified local real estate agents and brokers who would most likely list your lot for sale on the MLS if it's in a good location and you're not asking too much for it. These licensed agents would advertise your property, show it to prospective customers, write up the sales contract, and most likely not charge you a thing unless and until the property is sold.
Another possibility is to check with private investment companies such as SunSpring Properties LLC that buy and sell their own land, they are not licensed agents or brokers for other owners. If the lot is well located and the price is right they sometimes add to their inventory.
Here's a link to SunSpring's local land for sale websites: