根据移民局网站信息:
If you live in:
Alaska, Arizona, California, Colorado, Hawaii, Idaho, Illinois, Indiana,
Iowa, Kansas, Michigan, Minnesota, Missouri, Montana, Nebraska, Nevada,
North Dakota, Ohio, Oregon, South Dakota, Utah, Washington, Wisconsin,
Wyoming, Guam or the Commonwealth of the Northern Mariana Islands
File your application at the:
USCIS Phoenix Lockbox
For U.S. Postal Service (USPS) deliveries:
USCIS
PO Box 21281
Phoenix, AZ 85036
For Express mail and courier deliveries:
USCIS
Attn: AOS
1820 E. Skyharbor Circle S
Suite 100
Phoenix, AZ 85034
我用USPS Priority Mail (overnight service),写的是最后一个地址。第二天就到了。
GOOD LUCK.