If you are getting paid from multiple individuals or businesses, then you are self employed. You can list your home address/phone number since that's where you work from.
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I agree with the answers provided by the attorneys here.
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I also agree with my colleagues that you should mention this information under the employment category and list yourself as self-employed. Be sure that you have listed this income on your personal income taxes as well.
There is a question on the N-400 regarding have you paid your taxes, etc. Make sure you are complying with the requirements noted in that question on the N-400, before you file the form with USCIS.