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HOLIDAY & SPECIAL EVENTS CALENDAR

All Oklahoma County Government offices will be closed on 2024 Holidays (observed) and 2025 Holidays (observed). For the Meeting schedule, or to research Agendas, visit the County Legistar (You will be taken away from the website).

06Apr

Property Valuation Appeal Deadline

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Apr 06, 2026 — Apr 06, 2026 (UTC-06:00) Central Time (US & Canada)

A taxpayer may file a appeal if the valuation of property has not increased or decreased from the previous year if the appeal is filed on or before the first Monday in April. Such appeal shall be made upon a form prescribed by the Oklahoma Tax Commission.

Elections & Community Events - Voting and election dates. Community events where the public is welcomed to attend.

IAAO Courses - Please visit the Oklahoma County IAAO Chapter web page for more information.

Important Dates - This category includes deadlines & important dates.

Observed Holidays - All Oklahoma County Government offices will be closed.

Notice - This category includes notices and reminders.

US Holidays - Nationally recognized days of significance.