City of Northglenn is: http://www.northglenn.org/taxes City of Westminster is: https://www.ci.westminster.co.us/BusinessServices/SalesTax/Default.asp City of Arvada is: http://arvada.org/business/register-for-sales-and-use-tax-online-filing-and-payment-portal Colorado Business Express is: https://www.colorado.gov/apps/jboss/cbe/ Colorado Sales & Use Tax Rates Booklet: https://www.colorado.gov/pacific/sites/default/files/DR0099.pdf
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