How to Write Apartment & Suite Numbers

Address Line 2 is an optional field on checkout and shipping forms used for apartment, suite, unit, or floor numbers. Learn what to put in Address Line 2 with visual examples.

Address Line 1 is the primary required address field on checkout forms used for your main street address, house number, and street name. Learn how to format it.

Learn the exact differences between Address Line 1 and Address Line 2 with examples, comparison tables, and form placement rules.

Stuck on a checkout form asking for State or Province? Learn what to enter for countries like the UK, UAE, Pakistan, Singapore, and Romania.

Stuck on a required State field for a country with no states like the UK, Singapore, or UAE? Learn how to fill or bypass mandatory State/Province inputs.

Confused by City, Suburb, or District fields on international shipping forms? Understand which field to fill based on your country's address format.

What is the difference between Billing Address and Shipping Address? Learn how card verification (AVS) works and when they can be different.

Can you enter a PO Box in Address Line 2? Discover when to put PO Box in Line 1 vs Line 2, and why FedEx/UPS reject PO Box deliveries.

What does C/O mean in an address? Learn how to format 'Care Of' (c/o) for packages sent to guests, employees, or family members.

Having trouble filling Address Line 1 and Line 2 on Shein, AliExpress, or Amazon? Learn how to format international addresses for smooth delivery.

Need to fill a US address for Apple ID, iTunes, Steam, or US billing? Learn the standard US address format, 2-letter state codes, and 5-digit ZIP codes.

Does Dubai or the UAE have a ZIP code? Learn how to fill mandatory postal code fields for UAE shipping addresses on Amazon, Shein, and DHL.

Master the UK address format: Learn where to put Building Name, House Number, Post Town, County, and UK Postcode on online shipping forms.

APO, FPO & DPO Military Addresses in Checkout Forms. Use the exact unit, PSC or CMR and box supplied by the recipient.

W-9 & W-8BEN Address Fields: Residence vs Mailing Address. W-8BEN line 3 must identify your actual tax residence, not a PO Box.

Fix Billing Address Mismatches: AVS, Stripe & PayPal. Check the billing street number and ZIP against the issuer’s current records.

International Shipping Addresses for DHL, FedEx & UPS. Check each field’s actual limit; UPS WorldShip address fields allow 35 characters.

Canadian Addresses & Postal Codes in US Checkout Forms. Use the recipient’s real postal code, not the A1A 1A1 pattern.

Japanese Addresses in English: Romaji & Seven-Digit Postcodes. Use the recipient’s supplied romaji spelling rather than inventing a street name.

Ireland Address Format: Counties, Eircodes & Online Forms. The first three characters are the routing key, not a county abbreviation.

German Addresses: House Numbers, c/o & DHL Packstation. Keep Straße and Hausnummer in that order, including any letter suffix.

Gate Codes, Buzzers & Delivery Notes: Address Line 2 Rules. Keep the unit number in the postal address even when you also give instructions.

Registered Agent vs Business Mailing Address on Forms. Read whether the field requests a registered office, physical location or mailing address.

Saudi National Address & SPL Short Address Format. A Short Address has four letters and four digits. Use your registered SPL details, including district and city.

South Korea: English Road Name Address & 5-Digit Postal Code. Use the current five-digit postcode, retaining leading zeros. Preserve building (-dong) and apartment (-ho) identifiers.

Australia: PO Box, Parcel Locker, State Abbreviations & Postcodes. Write suburb, state abbreviation and four-digit postcode together. A PO Box and a Parcel Locker are different delivery services.

Mexico Address Forms: Colonia, Calle, Exterior/Interior & Código Postal. Calle is the street; número exterior is the building number. Preserve all five postal digits, including leading zeros.

Hong Kong Address Without a Postal Code: Checkout Form Fix. Hong Kong does not operate a local postcode system. 00000 and 999077 are not Hong Kong postal codes.

Italy: Via/Piazza, CAP Postal Code, Comune & Province. Write Via or Piazza, street name, then house number. Use the correct province: examples include RM, MI, NA, TO and FI.

Spain: Calle, Número, Piso, Puerta & Código Postal. Calle is the street and número follows the street name. Put the postcode before the locality on an envelope.

Netherlands: Postcode 1234 AB, House Number & Addition. A postcode has four digits and two uppercase letters. Copy huisnummertoevoeging exactly as registered.

Switzerland: Four-Digit PLZ / NPA / CAP Address Format. PLZ, NPA and CAP are language labels for the postal code. Do not append internal database postcode additions to the label.

What Is a ZIP+4 Code? Nine-Digit ZIPs in Checkout Forms. ZIP+4 has five digits, a hyphen and four more digits. Follow the form’s five-digit or ZIP+4 instructions.