The Land Records Division is located on the 3rd Floor of the Fairfax County Courthouse at 4110 Chain Bridge Road, Suite 317, Fairfax, VA 22030. This webpage will provide you your pay-off amount as well as how to calculate your payoff amount if you will be mailing in a check to pay off your auto loan.Call Us 703-788-4800 Monday – Friday: 8 am – 6 pm Saturday: – 9 am – 1 pm Other important numbers Padlock icon Message Us Send a secure email message. A payoff letter provides instructions on how to pay off a loan with a lump sum before the loan term ends. Learn how payoff letters work. Contact the United Bank Customer Service team via Phone Number Support (800)327-9862, or e-mail. If you do not resolve your tax bills on time, we may proceed with collections actions, such as wage liens and bank liens. NextMark Credit Union PO Box 1300. Fairfax, VA 22038-1300. If you have the funds to pay off an installment loan early, request a payoff letter from your lender.