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我是H1b，8月中旬到期！孩子是h4,暑假回国，明天回来。目前我延期的资料已经file到Uscis，6月底已经收到receipt notice,是WAC…,明天孩子从国内回来，我要给他办h4延期的孩子，提交的资料邮寄到哪里？我在uscis网站上没有找到，一般都是配偶，没有孩子！

-See: https://www.uscis.gov/i-539-addresses

All other Forms I-539, including: Change of status from A, G, or NATO classifications to another nonimmigrant classification (once an endorsed Form I-566 has been received by applicant); or, A Form I-539 filed separately from a principal’s Form I-129, with the exception of 1) a Form I-539 filed by an H-4 spouse of an H-1B nonimmigrant or filed concurrently with Form I-765 for category (c)(26).; or 2) a Form I-539 filed by P-4 dependents of major league athletes or support personnel. Please see guidance above for instructions on a Form I-539 filed separately by such H-4 spouse or P-4 dependent

USCIS Dallas Lockbox USPS USCIS P.O. Box 660166 Dallas, TX 75266 USPS, express mail and courier deliveries: USCIS ATTN: I-539 2501 S. State Highway 121 Business Suite 400 Lewisville, TX 75067

希望能给指导

今天研究延期，发现最好提前45天，目前我孩子h4距离过期只有30天，是否能成功延期？-Yes.

递交材料时需要做啥准备？

-See I-539 Instructions.