Regs - name and port can be anywhere
To summarize - must be at least 4", can be together anywhere, is violation to not follow regs. We put name and port on stern 4" and 9" name on side. Here are the official regs:MARKING INSTRUCTIONS Every documented vessel must be marked with its official number, name and hailing port. OPERATION OF A DOCUMENTED VESSEL WITHOUT PROPER MARKINGS IS A VIOLATION OF U. S. REGULATION. All exterior markings must be in clearly legible letters of the Latin alphabet or Roman or Arabic numerals not less than four inches in height. OFFICIAL NUMBER: The official number awarded by the Coast Guard must be permanently marked in block-type Arabic numerals not less than three inches in height on some clearly visible interior structural part of the hull. The number must be preceded by the abbreviation "NO", and be affixed in a manner which would make alteration, removal or replacement obvious. EXAMPLE: NO. 123456 NAME AND HAILING PORT FOR RECREATIONAL VESSELS: The name and hailing port must be marked together on some clearly visible exterior part of the hull. All exterior markings should not be less than four inches in height.