What happens if I forget my apartment number on a delivery?

If your building is small (2–4 units), the courier might figure it out from mailboxes or a small directory. In larger buildings (5+ units), the package will typically be marked undeliverable and returned to the facility. Contact the carrier immediately to provide your apartment number.

Can the carrier look up my apartment number based on my name?

Rarely. Most carriers don't have access to building resident databases. In very small buildings with labeled mailboxes, a courier might match your name, but this is unreliable. Don't count on it.

Will my package be held at the post office if the apartment is missing?

Possibly. If the package is undeliverable due to missing apartment, it will be held at the local post office or carrier facility for 5–15 days. You can pick it up with your photo ID and tracking number.

How fast do I need to act after noticing the missing apartment number?

Within 24 hours of shipment. The faster you act, the better the chance the carrier can add the apartment number before the delivery attempt. After 48 hours, the package is likely already at the local facility and it may be too late.

Can I add my apartment number to an order after it shipped?

Not through the retailer (too late). But you can contact the carrier directly and ask them to add the apartment number to the delivery instructions. This works about 60–80% of the time if you act quickly.

Missing Apartment Number? Here's What Happens & How to Fix It

You entered your street address perfectly — 123 Main Street, Chicago, IL 60601. But you forgot the apartment number: Apt 4B. Now the package has no idea which of the 20 units you're in.

A missing apartment number is one of the most common address problems, and the outcome depends heavily on your building type and carrier. In a small building, you might be fine. In a large complex, your package will almost certainly be marked undeliverable.

Here's what happens, what you can do, and the fastest way to get your package.

What It Means

A missing apartment number means the carrier has your street address but no way to identify which specific unit within the building.

What happens depends on the building:

Small building (2–4 units):

Courier may figure it out from mailboxes with names
Or from a small directory at the entrance
May deliver successfully

Medium building (5–20 units):

Courier may attempt delivery if there's a front desk or locker
May check mailboxes for matching names
Uncertain; depends on carrier and building

Large building (20+ units):

Almost certainly marked undeliverable
No way for courier to determine which unit
Returns to facility

Gated community or complex:

No unit number = package can't even get past the gate
Undeliverable in nearly all cases

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Why It Happens

Why apartment numbers get forgotten:

1. Auto-filled address without unit number Browser autofill pulled the street address but not the apartment number.

2. Separate address fields confuse the user Some checkout forms have "Address Line 1" and "Address Line 2" (where apartment goes). People fill Line 1 and skip Line 2.

3. Presumed it wasn't necessary People assume the carrier will figure it out — which is only true in very small buildings.

4. Retailer's website truncated the address The shipping label cut off the apartment number due to character limits.

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5. Moving and still entering old unit number habits Just moved to a new building and forgot to include the unit number.

How Long It Lasts

If the building has a front desk, locker, or concierge:

Normal delivery; no delay
Package held at front desk

If the building has visible mailboxes with names:

Courier may match your name to mailbox
Small chance of success; 1–2 day delay if courier investigates

If the building is small (2–4 units):

Courier may knock on each door
1 day delay at most

If the building is large with no directory:

Package immediately undeliverable
Held at facility for 5–10 days
Returned to sender
Total: 1–3 weeks before reorder

Urgency: Contact carrier within 24 hours — the window for correction is tight.

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Should You Be Concerned?

Yes — especially in large buildings.

Missing apartment numbers are serious because:

The carrier can't guess which unit
There's usually no system to look up resident names
Large buildings mean high uncertainty
Return-to-sender is common

Act quickly:

If you notice within 2 hours of ordering, contact retailer
If shipped, contact carrier and provide unit number
If tracking shows undeliverable, act within 24 hours

Better scenario (small buildings): Less concerning — courier may figure it out.

Worst scenario (large buildings, gated communities): Nearly certain problem.

What You Can Do

Step 1: Confirm the missing apartment number

Check your order confirmation email
If the apartment number is truly missing, proceed
Know your full address including Apt/Unit/Suite number

Step 2: Contact the retailer (if within 2 hours of order)

Call immediately: "My shipping address is missing the apartment number. It should be Apt 4B, 123 Main Street, Chicago, IL 60601."
If order hasn't shipped: They can add it for free
If shipped: Proceed to Step 3

Step 3: Contact the carrier

Call or use online tools:

USPS:

1-800-275-8777
Say: "My package [tracking number] is missing the apartment number. The full address is Apt 4B, 123 Main Street, Chicago, IL 60601."
They can add the apartment number to the delivery instructions

UPS:

1-800-742-5877 or UPS My Choice
Request intercept with complete address including apartment number
Cost: $0–30 depending on where package is in transit

FedEx:

1-800-463-3339 or FedEx Delivery Manager
Request address update with apartment number
May be free if the package hasn't reached the local facility

DHL:

1-800-225-5345
Request address completion with apartment number

Step 4: If the package is hold at facility

Pick up from facility with photo ID and tracking number
No apartment number needed when collecting yourself
Bring the full address for reference

Step 5: Prevent recurrence

Update saved addresses to include apartment number
Always check "Address Line 2" for apartments at checkout
Verify address appears complete before submitting

When to Contact the Carrier

Contact the carrier if:

You realized the apartment number is missing and the package has shipped
Tracking shows undeliverable or address issue
You want to add apartment number before first delivery attempt

Carrier contacts:

USPS: 1-800-275-8777
UPS: 1-800-742-5877
FedEx: 1-800-463-3339
DHL: 1-800-225-5345

Related guides:

What Happens If an Apartment Number Is Missing?