I-751 Mailing Address USCIS Lockbox — Current Rules

Where to Mail Form I-751

USCIS operates multiple lockbox facilities for Form I-751, Petition to Remove Conditions on Residence. The correct mailing address depends on two factors: the state where you live, and whether you are filing with a check or money order versus a credit card payment. Filing to the wrong lockbox does not simply delay your petition — it can cause USCIS to reject the filing outright, meaning your two-year conditional green card expires while the petition sits unprocessed. The difference is a matter of following the current filing chart exactly as published.

Form I-751 removes the conditions on a green card obtained through marriage to a U.S. citizen or lawful permanent resident. The petition must be filed during the 90-day window before the two-year conditional green card expires. USCIS does not accept early filings outside that window, and late filings create a gap in lawful status that triggers removal proceedings. The mailing address is not a minor procedural detail — it is part of the filing itself, and an error here has the same consequence as missing the deadline.

Here's the Honest Answer:

USCIS does not publish one universal lockbox address for I-751. The agency routes filings through regional lockbox facilities to manage volume and distribute workload across service centers. Filing to the wrong lockbox means your petition enters the wrong processing queue, and USCIS does not automatically forward it to the correct facility. The petition is either rejected and returned, or it sits unprocessed until someone notices the error — by which time your conditional status has expired. There is no administrative fix once that happens; you are in removal proceedings, and adjustment of status is no longer an option.

The filing chart on the USCIS I-751 instructions page lists the current lockbox addresses by state. As of 2026, USCIS maintains separate lockbox addresses for petitions filed with a check or money order versus those filed with a credit card charge authorization (Form G-1450). The chart also notes special addresses for applicants filing from U.S. territories or from outside the United States. Every I-751 filer must verify their state on that chart and use the address corresponding to their payment method before sealing the envelope.

The USCIS Lockbox System

A lockbox is not a service center. Lockbox facilities are intake points operated by contractors under USCIS supervision. The lockbox receives the petition, logs it into the case management system, processes the payment, generates the receipt notice, and forwards the file to the appropriate service center for adjudication. The service center that ultimately adjudicates your I-751 is determined by the lockbox routing — you do not choose it directly.

USCIS assigns states to lockbox facilities based on geographic regions and processing capacity. The assignments change periodically as USCIS adjusts workload distribution. An address that was correct in 2024 may not be correct in 2026. The only authoritative source for the current lockbox address is the USCIS I-751 form instructions page, updated each time USCIS publishes a new edition of the form or issues a filing location change. Third-party summaries, older blog posts, and forum advice cannot be trusted — the address you mail to must come from uscis.gov/i-751, verified the week you file.

The lockbox contractor date-stamps the petition on the day it arrives at the facility. That date is your filing date, not the postmark date and not the date USCIS generates the receipt notice. If your conditional green card expires on June 15, filing on June 14 means the petition must arrive at the lockbox by June 14. Certified mail with a tracking number is the only way to prove the arrival date if USCIS later disputes it.

Payment Method and Address Routing

USCIS routes I-751 petitions to different lockbox addresses based on how you pay the filing fee. Petitions filed with a personal check, money order, or cashier's check go to one address. Petitions filed with a credit card authorization (Form G-1450) go to a separate address. The two addresses are geographically distinct facilities — they are not processing variants within the same building.

This split exists because credit card payments require different intake procedures than paper checks. The lockbox processing a credit card payment must validate the card charge before forwarding the file to the service center, which adds a procedural step that does not apply to check payments. USCIS segregates these workflows by routing them to separate facilities.

If you file with a check but mail to the credit card lockbox address, or vice versa, USCIS will reject the petition and return it. The rejection notice will state that the petition was filed at the wrong location. By the time you receive the rejection, resend the petition, and it arrives at the correct lockbox, your conditional status may have already expired. USCIS does not extend the filing window to account for mailing errors.

Current Lockbox Addresses as of 2026

USCIS publishes the current I-751 mailing addresses on the form instructions page at uscis.gov/i-751. The addresses below reflect the filing chart as of early 2026. These addresses are subject to change without advance notice — confirm them on the USCIS website before you mail your petition.

For applicants in most states filing with a check or money order:
USCIS
Attn: I-751
P.O. Box 4300
Carol Stream, IL 60197-4300

For applicants in most states filing with a credit card (Form G-1450):
USCIS
Attn: I-751
P.O. Box 4380
Carol Stream, IL 60197-4380

For applicants in Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming, Guam, or the Northern Mariana Islands filing with a check or money order:
USCIS
Attn: I-751
P.O. Box 21251
Phoenix, AZ 85036

For applicants in the same states and territories filing with a credit card:
USCIS
Attn: I-751
P.O. Box 20751
Phoenix, AZ 85036

For applicants filing from outside the United States:
USCIS Dallas Lockbox
Attn: I-751
2501 S. State Hwy 121, Business Suite 400
Lewisville, TX 75067

These addresses are snapshots. They will change. USCIS sometimes consolidates lockbox facilities, shifts state assignments between regions, or closes a lockbox and redistributes its caseload. The addresses printed in older I-751 filing guides, shared in online forums, or listed on law firm websites that have not updated their content since 2024 are unreliable. The only address that matters is the one on the current USCIS form instructions the week you file.

What If I Filed to the Wrong Lockbox?

If you realize you mailed Form I-751 to the wrong lockbox address, contact USCIS immediately. Call the USCIS Contact Center at 1-800-375-5283 and explain that the petition was sent to an incorrect facility. USCIS may be able to intercept the filing and reroute it internally, but this is not guaranteed. The agency has no obligation to fix mailing errors, and the outcome depends on how quickly the lockbox staff identifies the problem.

If the petition is rejected and returned, file again immediately at the correct address. Include a cover letter explaining that this is a resubmission due to a mailing error, and attach a copy of the rejection notice if USCIS provided one. Note the original mailing date and the date the petition was returned. This does not preserve your original filing date, but it documents the timeline in case USCIS later questions whether you filed within the 90-day window.

If your conditional green card expires while the petition is in transit or being corrected, you lose work authorization and cannot travel internationally. The automatic extension of status that applies to timely I-751 filers does not apply to filings sent to the wrong address, because USCIS does not consider those filings to be properly submitted until they arrive at the correct lockbox. The gap in status is your responsibility to cure, not USCIS's.

What If My Receipt Notice Lists the Wrong Service Center?

The receipt notice for Form I-751 will list the service center that will adjudicate your petition. This is not necessarily the service center closest to where you live. USCIS assigns I-751 cases to service centers based on workload balancing, not geography. You cannot request a transfer to a different service center, and filing at a specific lockbox address does not control which service center receives your case.

If the receipt notice lists a service center you did not expect, that is not an error. USCIS routes cases internally after the lockbox processes them. The service center listed on the receipt notice is the one that will handle your petition unless USCIS transfers it for administrative reasons during adjudication. Contacting USCIS to request a different service center will not change the assignment and may delay processing while the inquiry is handled.

What If I Need to File from Outside the United States?

Conditional residents who are temporarily or permanently outside the United States when the I-751 filing window opens must still file the petition within the 90-day window. USCIS provides a separate lockbox address for international filers, listed above. Use an international courier service that provides tracking and proof of delivery — standard international mail does not offer the documentation you need if USCIS later disputes the filing date.

Filing from abroad does not change the filing fee, the evidence requirements, or the consequences of missing the deadline. The petition must still include all required supporting documents, and USCIS will schedule the biometrics appointment and any required interview at a U.S. office after you return. If you do not return to the United States for biometrics or the interview, USCIS will deny the petition for failure to appear.

Evidence and Filing Requirements

Form I-751 requires documentary evidence proving that the marriage on which the conditional green card was based is genuine and was not entered into for immigration purposes. The petition must include evidence spanning the entire two-year conditional residence period. USCIS evaluates whether the couple has commingled their lives in ways consistent with a real marriage — joint financial accounts, joint ownership of property, joint lease or mortgage, shared bills, insurance policies naming each other as beneficiaries, birth certificates of children born to the marriage, and affidavits from people who know the couple.

The filing fee for Form I-751 is set by USCIS regulation and changes periodically. As of 2026, confirm the current fee on the USCIS fee schedule at uscis.gov/forms before you mail your petition. Filing with an incorrect fee amount will cause USCIS to reject the petition. If you file with a check, make it payable to "U.S. Department of Homeland Security" — never abbreviate it, and never use a personal shorthand.

The petition must be filed jointly by both spouses unless you qualify for a waiver. Waivers are granted when the marriage ended in divorce, the U.S. citizen or permanent resident spouse is deceased, or the conditional resident was subjected to battery or extreme cruelty. Waiver filings have different evidence requirements and are adjudicated under different standards. The lockbox address for waiver filings is the same as for joint filings, but the waiver basis must be clearly stated on the form and supported by documentation.

Processing After the Lockbox

Once the lockbox processes your I-751 petition and forwards it to the assigned service center, USCIS will mail a receipt notice to the address you listed on the form. The receipt notice confirms that USCIS received the petition, lists the receipt date (your filing date), provides a case number for tracking, and extends your conditional green card and work authorization for 24 months from the card's original expiration date. This extension is automatic for timely filers — you do not need to request it separately.

The 24-month extension applies only to I-751 filers whose petitions were timely filed and accepted by USCIS. It does not apply if the petition was filed late, rejected for insufficient payment, or sent to the wrong address. The extension notice itself is a sticker on the back of the receipt notice that you carry with your expired conditional green card. Together, they prove lawful status for employment verification, travel, and other purposes during the adjudication period.

USCIS will schedule a biometrics appointment after issuing the receipt notice. Biometrics appointments are mandatory and must be attended in person at a USCIS Application Support Center. If you cannot attend the scheduled appointment, submit a request to reschedule through the USCIS Contact Center or by following the instructions on the appointment notice. Missing the biometrics appointment without rescheduling will cause USCIS to deny the petition.

If USCIS requires an interview, you will receive an interview notice listing the date, time, and location. Not all I-751 petitions are interviewed. USCIS schedules interviews when the submitted evidence does not clearly establish that the marriage is bona fide, when the couple has been married for less than two years at the time of filing, or when USCIS identifies inconsistencies in the petition or prior immigration filings. Both spouses must attend the interview unless the petition is based on a waiver.

Legal Disclaimer

This article provides general information about USCIS lockbox addresses and Form I-751 filing procedures. It is not legal advice and does not create an attorney-client relationship between the reader and the Law Offices of Peter D. Chu or any attorney. Immigration outcomes depend on individual facts, case-specific evidence, and the application of federal regulations that change frequently. Do not rely on this article as a substitute for consultation with a licensed immigration attorney who can review your specific situation and provide guidance tailored to your case. For personalized assistance with Form I-751 or any other immigration matter, contact an immigration attorney directly.

The Law Offices of Peter D. Chu offers consultations for conditional residents preparing to file Form I-751. The consultation fee is $250. During the consultation, an attorney will review your marriage-based green card history, evaluate your evidence file, explain the joint filing or waiver process, and answer questions about lockbox filing procedures and adjudication timelines. To schedule a consultation, call 858-268-8823 or visit peterchu.com. The office is located at 4615 Convoy Street, San Diego, CA 92111, and is open Monday through Friday, 8:30 AM to 5:30 PM.

Schedule a consultation with the Law Offices of Peter D. Chu — 4615 Convoy St, San Diego, CA 92111 · 858-268-8823 · Mon–Fri, 8:30 AM–5:30 PM. Consultation fee: $250.