Once you've paid off a loan, you should expect to get paperwork from your loan services provider documenting this fact. If you don't, contact them and ask for it. This can be useful in situations where the loan payment is left on your credit report even after it's paid off: the documentation will help you clear the record.
Loan services are designed to provide you with the help that you need, in a variety of ways. Some locations will only provide a special need, for example mortgages. Others are much more versatile and can fill virtually any type of loan you may be after. When it comes to selecting the right one, consider what each can provide for you.