How do I find my Company ID?

Your QuickBooks Online company ID is a unique number we use to identify your company. 

There are two ways to find your Company ID:

First: 

From the Billing & Subscription page
1.     Select the Gear icon on the Toolbar.

2.     Under Your Company, select Account and Settings (or Company Settings).

3.     Select Billing & Subscription. The Company ID will be in green at the top of the Billing & Subscription section.

Second: 

Using keyboard shortcuts

Press Ctrl+Alt+? (for Windows) or Control+Option+? (for Mac). 
A pop-up window will appear with your company ID.

 
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ORIGINAL SOURCE CONTENT HERE:

https://quickbooks.intuit.com/community/Getting-Started/How-do-I-find-my-Company-ID/m-p/185551