Do you capitalize addresses on invoices or envelops?

So when filling out a envelope do you say Fourth Floor or fourth floor?

Basically is it better to say

Jan Doe
2323 west America drive
Seattle, WA 98133

Or:
Jan Doe
2323 West America Drive
Seattle, WA 98133

Answer:
it's actually easier for the postal service's scanners to read addresses in all capital block letters (printed instead of cursive) with no punctuation. your mail will get wherever it's going regardless but there's less chance of an error if it's done this way

JAN DOE
2323 WEST AMERICA DRIVE
SEATTLE WA 98133
The second one is correct.
You always capitalize on addresses.
Jan Doe
2323 West America Drive
Seattle, Washington 98133

Thats how I would do it.
Doh!
The second address would be correct. When saying floor you can 4th FL or you can spell it out.
Your second example is correct however, as long as the address is the right, both can apply. The letter or invoice will still get there.

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