You, as a sponsor, should indicate your country of domicile in item 5 of Part 4 “Information about you (sponsor)”. In general terms, a country of domicile is the country where you live, work and maintain your principal residence. According to the regulations, a sponsor who completes Form I-864 must be domiciled in the USA. But in certain cases, a person living outside the USA can claim a U.S. domicile for the purposes of filing Form I-864, Affidavit of Support.
If you are not currently living in the United States, you may still meet the domicile requirement if you can submit evidence to show that one of the following conditions applies:
– You are employed by certain organization (for example, the U.S. Government, international organizations, international U.S. firm, religious denomination) which presupposes long trips and living abroad.
– You are living abroad temporarily, but you intend to return to your home in the USA. If you are currently living abroad, you must prove that your trip overseas is temporary and that you keep ties to the USA after departing. Examples of proof may include: records of paying U.S. state or local taxes; having property in the United States; maintaining bank or investment accounts in the USA, etc.
– You intend in good faith to reestablish your domicile in the USA no later than the date of the intending immigrant’s admission or adjustment of status.
Meanwhile, if your place of residence and/or mailing address is not in the United States, but your country of domicile is the USA, you must attach an explanation and documentary evidence indicating how you meet the domicile requirement.