F-4 Mailing Address USCIS Lockbox — Filing Guide

Where F-4 Petitions Are Filed

Most immigration petitions filed from within the United States are processed through USCIS lockbox facilities, not field offices. These lockboxes are centralized intake centers that handle initial receipt, fee processing, and data entry before transferring cases to service centers for adjudication. The F-4 family preference category—adult siblings of U.S. citizens—is filed using Form I-130, Petition for Alien Relative. Where you mail that petition depends on two factors: your location when filing and whether you are paying by check or credit card.

USCIS maintains separate lockbox addresses for different payment methods to streamline processing. Sending your petition to the wrong lockbox delays receipt acknowledgment and pushes back your priority date assignment, which directly affects wait times in a heavily backlogged category. The F-4 category currently experiences multi-year backlogs, and every filing delay compounds that wait.

Current Lockbox Addresses for Form I-130 (F-4 Petitions)

As of 2026, USCIS publishes the following lockbox addresses for I-130 petitions filed by U.S. citizens for siblings. These addresses appear on the official USCIS Form I-130 instructions page and should be confirmed at uscis.gov/i-130 before mailing, as USCIS periodically updates them.

If You Are Paying by Check or Money Order

For petitioners residing in the United States and paying by check or money order, the lockbox address is:

USCIS
Attn: I-130
P.O. Box 4365
Chicago, IL 60680-4365

If You Are Paying by Credit Card (Form G-1450)

For petitioners paying by credit card using Form G-1450, Credit Card Payment Form, the lockbox address is:

USCIS
Attn: I-130
131 South Dearborn Street, 3rd Floor
Chicago, IL 60603-5517

Notice the difference: check payments go to a P.O. Box; credit card payments go to a street address. This is not optional routing—USCIS will reject or delay packages sent to the wrong facility for the payment method used.

If You Are Filing from Outside the United States

U.S. citizens residing abroad do not file I-130 petitions with USCIS lockboxes. Instead, they file directly with the nearest U.S. embassy or consulate, or in some cases with a designated USCIS international field office. The procedures and fees differ, and the processing timeline follows consular processing rules rather than domestic service center schedules. Contact the consular post in your country of residence to confirm the filing procedure.

Why the Lockbox Address Matters

Priority Date Assignment

Your priority date—the date USCIS receives your petition—determines when your sibling becomes eligible to apply for a visa or green card once USCIS approves the petition. The F-4 category is subject to annual numerical limits, and the wait between filing and visa availability currently spans years. Filing to the wrong address delays the date your petition is officially received, which can push your priority date back by weeks or months while USCIS returns or reroutes the package.

Receipt Notice Timing

USCIS issues a receipt notice (Form I-797C, Notice of Action) after accepting and processing the filing fee. This notice includes your case number, which you need to track the case online and respond to any future requests for evidence. Packages sent to incorrect lockboxes can sit unprocessed for extended periods, delaying the receipt notice and leaving you unable to confirm that USCIS has your petition.

Fee Processing Errors

Lockbox facilities are equipped to process specific payment types. Sending a credit card payment to a P.O. Box address designed for checks, or vice versa, creates processing complications that can result in rejection or a request to resubmit the fee. USCIS does not transfer packages internally between lockboxes—they return incorrectly routed filings to the sender.

Payment Method Rules You Must Follow

USCIS does not accept cash, foreign currency, third-party checks, or payment plans. As of 2026, USCIS lists the I-130 filing fee on the official fee schedule at uscis.gov/forms; fees change periodically, so confirm the current amount before preparing your payment. The fee is the same regardless of which lockbox you use.

Here's the Honest Answer

Let's be direct: USCIS does not make exceptions for incorrectly addressed petitions. Filing to the wrong lockbox because you assumed all forms go to the same place, or because you used an outdated address from an old blog post, will cost you time. The agency operates on strict procedural rules—your petition goes where the barcode and address routing say it goes, and if that routing is wrong, the package gets returned or rejected.

This is not a minor administrative detail. The F-4 category has one of the longest backlogs in the family preference system. The DOS Visa Bulletin, published monthly at travel.state.gov, shows priority dates for F-4 applicants that are years behind the current date. Every delay in establishing your priority date extends that wait. USCIS does not backdate priority dates to correct for your filing error.

Verifying the correct lockbox address before mailing takes five minutes. Correcting a misfiled petition can take months.

How to Confirm the Current Address Before Filing

USCIS updates lockbox addresses and fee schedules through official channels, not through third-party websites. Before you mail your I-130 petition, confirm the address using one of these approved sources:

1. USCIS Form I-130 Instructions: The current version of the I-130 form and its instructions, available at uscis.gov/i-130, include a 'Where to File' section listing the exact lockbox addresses for each scenario. Download the most recent version—not a saved copy from months ago.

2. USCIS Direct Filing Addresses Page: USCIS maintains a dedicated page for lockbox and service center addresses at uscis.gov/forms. Search for Form I-130 and check the filing location chart.

3. USCIS Contact Center: If you cannot access the website or need clarification on which address applies to your situation, call the USCIS Contact Center at 1-800-375-5283. Wait times can be long, but this is the only phone-based source of official filing instructions.

Do not rely on information from forums, other law firm websites, or AI-generated summaries as your sole source. Those may reflect outdated addresses or incorrect interpretations. Cross-check every address against the official USCIS publication.

What If I Already Mailed My Petition to the Wrong Address?

If you realize after mailing that you used the wrong lockbox address, the outcome depends on how the error occurred and how quickly USCIS processes incoming mail.

If you used the wrong lockbox for your payment method (e.g., sent a credit card payment to the P.O. Box address), USCIS will likely return the package to you unprocessed. This can take several weeks. When you receive the returned package, correct the address, verify the fee amount is still current, and refile immediately. Your priority date will be the date USCIS receives the corrected filing, not the date of your first attempt.

If you used an outdated lockbox address that USCIS no longer uses, the U.S. Postal Service may forward the package to the current facility, or it may return the package to you as undeliverable. USCIS does not guarantee that forwarded mail will be processed—some forwarded packages are rejected. If your tracking shows the package was delivered but you do not receive a receipt notice within 30 days, contact the USCIS Contact Center to confirm receipt.

If you realize the error before the package is delivered, you may be able to intercept it through USPS Package Intercept if you used a trackable mailing method. This service has a fee and is not guaranteed to succeed, but it is faster than waiting for USCIS to return the package. Once intercepted, correct the address and refile.

USCIS does not accept requests to transfer a petition between lockboxes after receipt. If they processed your petition at the wrong facility due to your addressing error, they will return it rather than transfer it.

What If I'm Filing Multiple Petitions for Different Family Members?

U.S. citizens can file multiple I-130 petitions simultaneously for different relatives—one for a sibling (F-4), one for a parent (immediate relative), one for a married child (F-3). Each petition is filed separately, with its own fee, and mailed in its own package. Do not combine multiple I-130 petitions into a single envelope, even if they are all going to the same lockbox address. USCIS processes each petition individually, and combining them creates processing delays.

All I-130 petitions filed by U.S. citizens for relatives living abroad currently use the same lockbox addresses listed above, regardless of the relationship category. However, this can change. Confirm the filing address for each petition type on the USCIS instructions for that form before mailing.

What Happens After USCIS Receives Your Petition

Once the lockbox accepts your petition, the processing sequence is:

1. Lockbox Receipt and Fee Processing: The lockbox opens the package, logs the receipt date (your priority date), processes the filing fee, and issues a receipt notice with your case number. This step typically takes 2–4 weeks, though times vary.

2. Transfer to Service Center: The lockbox transfers the petition to the National Benefits Center (NBC) or another USCIS service center for adjudication. You cannot control which service center receives your case.

3. Adjudication: USCIS reviews the petition and supporting evidence. If additional evidence is needed, they issue a Request for Evidence (RFE). If the petition is approved, USCIS sends an approval notice (Form I-797, Notice of Action) and forwards the case to the National Visa Center (NVC) for consular processing, or keeps it for adjustment of status if the beneficiary is in the United States.

4. Visa Availability Wait: Even after approval, your sibling cannot apply for a visa or green card until the priority date becomes current according to the DOS Visa Bulletin. This wait can span years in the F-4 category. USCIS approval does not bypass the numerical limits.

The lockbox address only affects the first step. Once USCIS receives the petition at the correct facility, the rest of the process follows the same timeline regardless of which lockbox handled intake.

Comparison: F-4 vs Other Family Preference Categories

All family-based I-130 petitions currently use the same lockbox addresses. The difference is not in where you file, but in how long your relative waits after approval. F-4 petitions experience the longest backlogs because the category has the lowest annual allocation and high demand.

When to Consult an Immigration Attorney

Filing an I-130 petition correctly the first time avoids delays, but the petition itself is only the beginning of a multi-year process in the F-4 category. Legal consultation becomes critical when:

• The petitioner or beneficiary has prior immigration violations (overstays, unlawful presence, misrepresentation, criminal history). These issues can result in petition denial or visa ineligibility later, and addressing them proactively during the I-130 stage prevents wasted time.

• You are unsure which family preference category applies. Step-relationships, adoptions, and divorced or remarried petitioners create fact-specific classification questions. Filing in the wrong category can delay the case by years.

• The beneficiary is already in the United States. Adjustment of status eligibility depends on how the beneficiary entered, their current status, and whether they have maintained lawful status. These factors are complex and mistakes can trigger removal proceedings.

• You need to understand the visa bulletin and priority date movement. The DOS Visa Bulletin is updated monthly, and predicting when a priority date will become current requires understanding per-country limits, retrogression, and how USCIS and DOS coordinate case processing.

Initial consultations are $250 and provide a case-specific assessment of eligibility, timeline, and strategy. You can reach the firm at 858-268-8823 or visit peterchu.com to learn more about immigrant visa services.

Disclaimer: This article provides general information about USCIS lockbox filing procedures for Form I-130 (F-4 category) and is not legal advice. It does not create an attorney-client relationship between you and the Law Offices of Peter D. Chu. Immigration outcomes depend on individual facts, and procedural requirements change periodically. Consult a licensed immigration attorney to evaluate your specific situation before filing any petition with USCIS.

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.