Illinois has a statewide manufacturer-funded electronics take-back program. So do dozens of other states. Missouri does not.
No Missouri law requires manufacturers to fund collection programs, and no statewide take-back quota applies to residents or businesses. If you are searching for a government-run drop-off site mandated by a state e-waste regulations Missouri law, you are unlikely to find one the way you might across the border in Illinois.
That absence means that the responsibility for responsible disposal falls more squarely on the individual generator, whether that is a household, a business IT department, a school district, or a municipality. You can still recycle electronics responsibly in Missouri, but you have to seek out the right channels rather than rely on a statewide infrastructure to catch your materials.
The regulations that do govern electronics recycling Missouri residents and businesses are primarily carried through from federal law, specifically the framework administered by the U.S. Environmental Protection Agency under the Resource Conservation and Recovery Act, commonly known as RCRA.