Can oci and renunciation be mailed together

According to the IRS, Form 8832 (Entity Classification Election) and Form 8854 (Initial and Annual Expatriation Statement) can be filed together, but they cannot be mailed together.

Here's what the IRS says:

Here are the mailing addresses:

It's important to note that you should keep a copy of both forms for your records, and you should also keep a copy of the receipts from the IRS showing that you filed the forms.