What is the address in Maryland to mail IRS Form 1099-Misc?

Are you referring to a 1099-MISC that you received from someone you worked for or the IRS copy that you had sent to someone who did work for you? If it's one you received, then you simply add the amount on your Schedule C or your return and file it as normal. If you are talking about IRS copies of ones that you sent to others, then you would fill out a 1096 form which is simply a total form of all your 1099 forms that you sent out. You attach all copies to the 1096 form and mail it to: Department of the Treasury, Internal Revenue Service Center, Kansas City, MO 64999.