How to Write Apartment & Suite Numbers
Standard abbreviations and placement for apartment, unit, suite, and floor details.
Apartment, suite, and unit numbers should be written in Address Line 2 or immediately following the street name in Line 1. Standard postal abbreviations include 'Apt' for Apartment, 'Ste' for Suite, 'Unit' for Unit, and 'Fl' for Floor. Avoid using the pound symbol (#) if possible, as some automated shipping systems strip special characters.
✓ Key Rules at a Glance
- Standard postal abbreviations: Apt, Ste, Unit, Fl, Dept, Bldg.
- Can be written in Address Line 2 or appended to Line 1 (e.g. 150 Broadway Apt 4B).
- Avoid special symbols like '#' or '/' that can break database fields.
- Include building or tower names for large residential complexes.
Online Store Logistics
100 Fulfillment Way
Seattle, WA 98101
Destination Address
Jessica Taylor
150 Broadway
Apt 12B Apartment Number (Apt 12B)
New York, NY 10038
UNITED STATES
Standard Postal Secondary Unit Abbreviations
To keep shipping labels clear and readable for barcode scanners, postal authorities recommend official secondary unit designators:
- Apartment:
Apt 4B - Suite (Offices/Businesses):
Ste 300 - Unit (Condos/Townhomes):
Unit 12 - Floor / Level:
Fl 3orLevel 2 - Building:
Bldg C
Should You Use the '#' Hash Symbol?
While writing #4B is common in handwritten notes, try to avoid using the pound/hash symbol (#) on digital checkout forms.
Some automated order management systems treat # as a special character or URL fragment delimiter, causing the text after # to be truncated or deleted. Use Apt or Unit instead.
❓ Frequently Asked Questions
Can I put Apt 4B on Address Line 1?
Yes! Writing '150 Broadway Apt 4B' on Line 1 is 100% valid and ensures the apartment number won't get cut off on short labels.
What is the difference between Apt, Unit, and Ste?
Apt is for residential apartments, Ste (Suite) is for commercial offices, and Unit is used for condos, townhomes, or industrial spaces.
Check Country-Specific Address Rules
Select a country to view official postal line layouts, required fields, and postcode formats:
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