That information wouldn't be directly included, but some account has to post the hit. That account is either associated with some company or some person who works for some company.
"Find city, county, state in this list and post in the three boxes "City" "County" "State" in the web form." is literally all the information required for this task. All of the rest can be handled by Amazon's staff, or more likely automated processes. The turker need not know for whom they do the work, or why. They could be processing marketing communications, or census returns, or credit card applications, or literally anything else where an address may be used.
So it's simply a fact of the platform that mTurkers know who they are working for.