Contact your city's local recycling center or waste-management center, and inquire as to whether they will accept glass-and concrete-countertops for recycling. Often, many city recycling centers will accept popular materials such as your countertop, and they will be able to dispose of it properly. You may need to bring the countertop to a specific location, but a city adviser will be able to direct you to a recycling center drop-off location. Some city recycling programs may allow you to place the countertop at the curb for a curbside recycling pickup.
Visit the Earth911 website, click on the "Construction" link located on the center of the page and then enter your zip code, city or state. The "Construction" link will direct you to locations in your area that accept items used during construction. Read the list of available locations, and contact a recycling center to make sure the center will accept the countertop before you bring your countertop to them.
Place an ad for your countertop in your local newspaper classifieds, on a Internet-based classifieds list, or on your preferred social networking website. List the countertop as "Free" and supply your contact information. Even if the countertop is not in perfect condition, someone may like to use it for a home project and you will help reduce waste entering a landfill while providing someone else with needed materials.