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 USCIS

 Attn: N-400  

 P.O. Box 4060

 Carol Stream, IL  60197-4060

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 USCIS 

 Attn: N-400 (Box 4060)

 2500 Westfield Drive 

 Elgin, IL 60124-7836

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 Attn: N-400

 P.O. Box 21251

 Phoenix, AZ 85036-1251

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 Attn: N-400 (Box 21251)

 1820 E. Skyharbor Circle S

 Suite 100

 Phoenix, AZ 85034-4850

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 Attn: N-400

 P.O. Box 660060

 Dallas, TX 75266-0060

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 Attn: N-400 (Box 660060)

 2501 S State Hwy 121 Business

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 Lewisville, TX 75067-8003

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 Attn: N-400

 P.O. Box 4380

 Chicago, IL 60680-4380

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 Attn: N-400 (Box 4380)

 131 S. Dearborn, 3rd Floor

 Chicago, IL 60603-5517