How To Write An Address With A Unit Number

Format addresses with apartment or unit numbers correctly for envelopes and online forms

Address Details

Format Type

Address Style

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How to Format Your Address

Simple steps to create amazing results

Write the Recipient's Name

Start with the full name of the person or business on the first line. Use proper titles like Mr., Ms., or Dr. if appropriate.

Add Street Address and Unit Number

On the second line, write the street number and name, followed by the unit number. Use abbreviations like 'Apt', 'Unit', 'Ste', or '#' before the unit number. Example: 123 Main St Apt 4B.

Complete with City, State, and ZIP

On the final line, include the city name, state abbreviation, and ZIP code. Ensure proper spacing between each element for postal service scanning.

Formatting Best Practices

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Multiple Format Options

Choose between placing the unit number on the same line as the street address or on a separate line, both are accepted by postal services.

Standard Abbreviations

Use recognized abbreviations like Apt, Unit, Ste, Bldg, or # to clearly indicate unit numbers and save space on envelopes and packages.

Proper Placement

Position the unit number after the street address but before the city, state, and ZIP code to ensure accurate mail delivery.

Clear and Legible

Write or print addresses in clear, uppercase letters when possible to help automated sorting systems read and process mail efficiently.

Frequently Asked Questions

Everything you need to know

Where should the apartment number be placed in an address?

The apartment number should be placed on the same line as the street address or on the line directly below it, depending on the format you are using.

Can I include the apartment number on the second line of the address?

Yes, you can place the apartment number on the second line of the address. For example: 123 Main St, Apt 4B.

What is the correct format for an apartment address?

The correct format for an apartment address typically includes the street address followed by the apartment or unit number, city, state or province, and zip or postal code.

What abbreviations can I use for unit numbers?

Common abbreviations include Apt (apartment), Unit, Ste (suite), # (number), Bldg (building), Fl (floor), and Rm (room). All are acceptable for addressing mail.

Do I need a comma between the street address and unit number?

A comma is optional but commonly used. Both '123 Main St, Apt 4' and '123 Main St Apt 4' are correct. Choose whichever is clearer and more readable.

What if my unit number includes letters and numbers?

Simply write the unit number exactly as it appears, such as 'Apt 4B' or 'Unit 12-C'. Include hyphens, letters, and numbers in the correct order for accurate delivery.

Ready to Format Your Address Correctly?

Ensure your mail reaches its destination with properly formatted addresses including unit numbers.