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500 S. Gillette Ave.
Gillette, WY 82716
P.O. Box 877
Gillette, WY 82717
Monday - Friday
8 AM - 5 PM
January 1st: All taxable property is listed, valued and assessed for taxation.
March 1st: Second installment of prior year property tax due (delinquent after May 10).
March 1st: Taxpayers must file a listing of taxable personal property with the County Assessor.
March 1st: Land owners must file mineral exemption forms.
On or Before the 4th Monday in April: Assessment schedules are mailed to taxpayers.
4th Monday in May: Qualified veterans (or surviving spouse) shall file for property tax exemption, (if using it for Real Estate Tax).
No Later Than July 31: All special districts inform the Assessor and County Commissioners of the amount of tax to be collected.
3rd Monday in August: County Assessor computes taxes and delivers assessment roll to County Treasurer for collection.
September 1st: First installment of current year property tax is due (delinquent after November 10th unless all taxes are paid by December 31st).
On or Before October 10: County Treasurer sends tax bills, including property description, assessed value and mill levies, to each taxpayer at last known address.