Hi, Mrs.mitchell0985. There are two reasons why QuickBooks adds Colorado to your Tax agencies. One reason is that you ship or perform services at your customer's address in Colorado, and the other reason is that you accidentally created a state tax agency. To remove this, we can make it Inactive in your Sales Tax Settings.
Here's how:
- Open your QuickBooks.
- Go to My Apps, then Sales Tax.
- Head to Sales Tax Settings.
- Under Actions, click the dropdown and select Make Inactive.

If there's an amount created in your Colorado sales tax, refer to this article to learn how to adjust and zero it out: Create or delete a sales tax adjustment in QuickBooks Online.
Feel encouraged to let us know in the comments if you have any other questions or concerns about QuickBooks.