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State guides / OK

Oklahoma property tax appeals

Served

Deadline
In Oklahoma the written protest goes to the county assessor within 30 calendar days of the date the notice of valuation was mailed, and the notice itself has to carry that mailing date. (68 O.S. 2876(E))
First level
County assessor (written protest, 68 O.S. 2876(E))
Next levels
County board of equalization; District court
Source: official text

General information, not legal or tax advice. The notice and local rules control.