Most people look up “PO Box 4115 Concord CA” for one reason: a letter arrived with that return address, the sender was not obvious from the envelope, and they want to know who sent it and whether it is safe to respond.
This guide answers that as honestly as the public record allows — where the box is held, what can and cannot be verified about who uses it, why the department number matters, and how to check a letter before you pay, reply, or share personal information.
Quick Facts: PO Box 4115, Concord, CA 94524
- Full address as it usually appears: PO Box 4115, Concord, CA 94524
- ZIP Code: 94524 — a PO Box-only ZIP Code for Concord, California
- Post office that holds the boxes for that ZIP Code: Concord Post Office, also called Concord Main
- Post office street address: 2121 Meridian Park Blvd, Concord, CA 94520-9998
- Post office phone: 925-687-0533, or 1-800-ASK-USPS (1-800-275-8777)
- Retail hours: Monday to Friday 9:00 a.m. – 5:00 p.m., Saturday 9:00 a.m. – 2:00 p.m., Sunday closed
- Lobby and PO Box access: Listed as 24 hours a day — check the USPS listing before you travel, as hours can change
- What it is not: Not a house or a walk-in office for the sender. It is a locked mailbox inside a USPS facility.
Where Is PO Box 4115 in Concord, CA?
The 94524 ZIP Code Explained
Concord has several ZIP Codes. Street addresses mainly use 94520 and 94521. ZIP Code 94524 is different: it is used only for PO Boxes at the Concord Post Office. That is why it does not match the building’s ZIP Code — 2121 Meridian Park Blvd uses 94520, while the boxes inside use 94524.
In practical terms:
- If you want to write to the box holder, you use: PO Box 4115, Concord, CA 94524.
- If you want to visit the post office that holds the box, you go to: 2121 Meridian Park Blvd, Concord, CA 94520.
- You cannot visit Box 4115 itself as a member of the public, knock on a door there, or ask the counter staff who rents it. More on that privacy rule below.
The Concord Post Office at 2121 Meridian Park Blvd
The Concord Post Office is the main post office for the city, in Contra Costa County in the East Bay. USPS listings for this location include retail services, bulk mail acceptance, passport services, and pickup of accountable and held mail. If you need to speak to USPS about a letter — damaged, misdelivered, or to refuse it — this is the facility to contact during retail hours.
For more of our practical US guides, see our guide to finding an emergency plumber available 24/7 in the USA.
Who Rents PO Box 4115? What Can Actually Be Verified
Accuracy matters here, because many low-quality lookup pages state a single company name as proven fact, without a source, and often contradict each other. Here is what can be stated responsibly.
USPS Does Not Publicly Disclose PO Box Renters
A PO Box is rented using USPS Form PS 1093. That application information is not a public directory.
Under the Privacy Act of 1974 and USPS disclosure rules in Title 39 of the Code of Federal Regulations, Section 265.6, boxholder information from Form PS 1093 is released only in limited circumstances — for example, to government and law enforcement agencies for official purposes, on a court order, or to process servers in the specific written format USPS requires.
In plain language: USPS will not tell a member of the public who rents Box 4115, and there is no official public register to search. Any site claiming to give the definite, current, sole owner from a free lookup is going further than USPS itself goes.
One Specific, Sourced Association: Dept 922
One department version of this address can be tied to a named company from a reputable source.
The Better Business Bureau (BBB) Business Profile for Portfolio Recovery Associates, LLC — a collections agency headquartered in Norfolk, Virginia — lists among its locations:
PO Box 4115 Dept 922, Concord, CA 94524-4115
The BBB categorises that business under Collections Agencies. That listing is evidence that Portfolio Recovery Associates has used the Dept 922 version of this Concord address as one of its locations. It is not evidence that:
- it is the only user of Box 4115,
- it still uses the box today in exactly the same way, or
- every letter from Box 4115 — whatever department number it carries — came from that company.
Treat the BBB listing as a useful clue for Dept 922 mail, not as a complete answer for all mail from the box.
Why the Department Number Is Your Biggest Clue
Look again at your envelope. Many letters from this address do not show just “PO Box 4115.” They show a line above it, such as:
- Dept 922 PO Box 4115
- Dept 555 PO Box 4115
- Another Dept number followed by PO Box 4115
Large mailers use department numbers as internal routing codes — for a client, account type, campaign, or the unit that should receive your reply. Two letters can share the same box and have different purposes, separated only by that Dept line. So do not identify your sender from the box number alone. Identify them from the letter inside.
Why You Might Receive Mail From a Concord PO Box
A sender does not need to live or work in Concord to receive mail there. Businesses rent boxes in other cities for return mail, payments, disputes, and processing. Individuals rent them for privacy or a stable address. Common legitimate reasons include:
- A debt collection letter. If the letterhead inside names a collections agency, states an amount, and names an original creditor, this is the most likely category for Dept 922 mail, given the BBB listing described above. The letter itself — not the envelope — should confirm it.
- An account or billing notice. A company you have an account with may use a central PO Box for replies, disputes, or documents, even if its head office is in another state.
- A data breach or legal notice. Companies sometimes must notify large numbers of people by post, often from a central processing address.
- A reply address for a form. Benefits, insurance, and membership paperwork commonly directs replies to a PO Box set up for that form.
- Mail for someone else. The letter may be for a previous occupant or someone with a similar name.
None of these proves a letter is genuine. Scammers copy the format of real official letters because it makes people act quickly.
How to Check Whether Mail From PO Box 4115 Is Legitimate
Work through these steps in order, before you pay anything or call any number printed only in the letter.
1. Read the Letter Inside, Not Just the Envelope
The letter should give you the sender’s full legal name, a reference number, the reason for writing, and what you are asked to do. If there is no clear sender name inside, treat it with extra caution. Note the Dept number, date, and any deadline, and keep the envelope — postmarks can matter if you dispute the letter.
2. Verify the Sender Independently
Do not rely only on a phone number, website, or QR code printed in a suspicious letter. Instead:
- Find the company’s official website independently and compare its contact details with the letter.
- If it claims to be from a bank, agency, or creditor you deal with, contact them using the number on your card, statement, or official app — not the number in the letter.
If the sender cannot be found outside the letter, do not send money or personal information.
3. If It Is a Debt Letter, Use Your Validation Rights
Under the Fair Debt Collection Practices Act (FDCPA), a collector’s validation notice should state the amount owed and the creditor’s name, and you generally have 30 days from receiving it to dispute the debt in writing and request verification, as the Consumer Financial Protection Bureau (CFPB) explains.
If you dispute in writing within that window, keep copies, send it by a method with proof of delivery, and the collector should pause collection on the disputed amount until it provides verification. Do not admit to or part-pay a debt you do not recognise until you have checked it.
The Office of the Comptroller of the Currency (OCC) warns that fake debt collection is a real fraud type: scammers impersonate collectors, invent debts, and use threats of arrest or immediate action. Real collectors may not threaten arrest for a civil debt, refuse written verification, or demand payment only by gift card, wire, or prepaid card. Those are red flags, whatever the return address.
4. Watch for General Mail Scam Warning Signs
Be suspicious if a letter from any PO Box:
- Demands urgent payment to avoid arrest, benefit loss, or account closure within hours
- Asks for your full Social Security number, bank login, or card details by return post, phone, or a linked website
- Promises a prize, lottery win, or inheritance in exchange for a fee
- Contains a check you were not expecting and asks you to deposit it and forward part of the money
- Uses a government-sounding name but gives only a PO Box and a mobile-style contact number
- Has spelling, formatting, or company details that do not match the organisation it claims to be from
A PO Box alone is not a sign of a scam. Legitimate businesses and individuals use them for privacy and security — the benefit USPS promotes for the service. The warning sign is pressure plus secrecy plus an unusual payment method, not the box.
What to Do About Unwanted or Suspicious Mail
- If the letter is not for anyone at your address: Write “Not at this address — return to sender” on the unopened envelope and put it back in outgoing mail. Do not open mail addressed to someone else.
- If you recognise the sender and the matter is yours: Deal with them through independently verified details, and keep a written record.
- If you suspect mail fraud: Report it to the U.S. Postal Inspection Service at uspis.gov and to the Federal Trade Commission at ReportFraud.ftc.gov. Keep the letter and envelope as evidence.
- If a collector will not verify a debt: Complain to the CFPB and your state attorney general, and log calls and letters with dates.
- If you sent money or shared information: Contact your bank quickly, place a fraud alert or credit freeze, and report the loss to the FTC and local law enforcement.
Do not throw a suspicious letter away before noting the sender, Dept number, date, and reference number — investigators and advisers will ask for them.
How to Rent Your Own PO Box at the Concord Post Office
If you want the same privacy and stable address, you can rent a PO Box online through the official USPS PO Boxes page, search for the Concord location, and check sizes and availability. USPS describes the process as:
- Apply online or in person. Online, find, reserve, and pay for a box at a post office near you. In person, complete PS Form 1093 at the counter.
- Verify your identity. Take your completed application and two forms of acceptable U.S. identification to the post office where your box is located, within 30 days of an online application.
- Collect your keys or combination. Once a retail associate verifies your identity, you will receive your box keys or lock combination.
- Choose a size and term. Most post offices offer five sizes, from extra small to extra large, for terms of 3, 6, or 12 months. Price depends on size and location, so check the Concord price in the USPS search. USPS also notes optional Street Addressing for packages from other carriers at some locations, subject to availability.
You can also confirm current retail hours, services, and box availability for this specific facility on the USPS location page for the Concord Post Office before you visit.
Frequently Asked Questions
What is PO Box 4115, Concord, CA 94524?
It is a numbered, locked USPS mailbox — Box 4115 — held at the Concord Post Office in Concord, California. Mail to it uses the PO Box-only ZIP Code 94524, while the post office building itself is at 2121 Meridian Park Blvd, Concord, CA 94520.
Who sent me a letter from PO Box 4115, Concord, CA?
USPS does not publicly disclose PO Box renters, so the box number alone cannot tell you. The Better Business Bureau lists Portfolio Recovery Associates, LLC, a collections agency, at the Dept 922 version of this address. For any other Dept number, or to confirm your letter, read the sender name printed inside the letter and verify that company independently.
Is mail from PO Box 4115 Concord CA a scam?
Not automatically. A PO Box is a normal mailing address used by legitimate businesses and individuals. Check the letter for pressure tactics, unusual payment demands such as gift cards or wire transfers, and a sender you cannot verify independently. If it is a debt letter, use your right to request written validation before paying.
What should I do if I get a debt letter from this address?
Keep the letter and envelope, note the Dept number and deadline, and verify the sender through contact details you find independently. If you do not recognise the debt, dispute it in writing within 30 days of the validation notice and request verification. Do not pay a debt you do not recognise just because a letter looks official.
Can I visit PO Box 4115 or find out who rents it at the post office?
No. You can visit the Concord Post Office at 2121 Meridian Park Blvd during retail hours for USPS services, but counter staff cannot give you a box holder’s private information. USPS releases boxholder information only in limited legal and official circumstances, such as a court order or a qualifying law enforcement or process-server request.
The Bottom Line
PO Box 4115, Concord, CA 94524 is a real USPS box at the Concord Post Office, 2121 Meridian Park Blvd, using the PO Box-only ZIP Code 94524. That much is verifiable.
Who sent your specific letter is in your hands, not in a lookup site. Check the Dept number, read the letterhead, note the BBB listing for Dept 922, verify the named sender independently, and use your validation and reporting rights if anything does not add up.
