Colorado Special Districts with Additional Use Tax

It depends. I believe you are referring to the use or sales taxes that States require residents to report sales tax (use tax) when you buy something out-of-state and paid no sales tax.

It would seem that your address would be a consideration of the special districts taxes when purchasing products from online vendors.

Of course it's not possible to know that for sure.  It's up to the individuals to track whether the sales tax is being paid on purchases, and then, if not a taxpayer should enter any amount where sales tax was not charged.  

• CO Consumer Use Tax FAQs

Colorado use tax is calculated by adding up all purchases you made from out of state (or online from a state other than CO) while a resident in Colorado and multiplying that by your 2.9% sales tax rate or if you are in a district with special district taxes then you will use that rate. There is a credit available for sales tax paid to another state on the purchases.  

Leaving the use tax box blank or entering $0 does not absolve you of use tax liability. It’s possible you could face a use tax audit, particularly if you purchased high-dollar items or were running a business.

Colorado says, 'However leaving it blank does not mean that the taxpayer is formally stating there is no use tax liability … The Department's working assumption will be that the taxpayer either had no use tax liability or they chose to report it through one of the other methods available to them.'