Sources
Every figure on this site comes from one of these official publications. Retrieved October 16, 2026.
- Oklahoma County Tax Rates/Millages for 2025 (certified Nov 17, 2025)
- Cleveland County 2025 Tax Levies (dated 10/27/2025)
- Canadian County 2025 Ad Valorem Tax Levies (certified Oct 14, 2025)
- Logan County Tax Levies 2025-2026 (county clerk, certified Oct 15, 2025)
- Oklahoma State University: Oklahoma Ad Valorem Mill Levies, Fiscal Year 2026 (Grady, McClain, Lincoln, Pottawatomie and Kingfisher county tables; compiled from certified county levy reports filed with the State Auditor & Inspector)
- Oklahoma Tax Commission 2024 Ad Valorem Statistics Book (real property assessment percentages by county)
- Logan County: computing property tax (11% assessment ratio)
- Oklahoma County Assessor estimated tax calculator (11% ratio)
- Oklahoma County Assessor (glossary, protests, homestead)
- Cleveland County glossary (12% ratio)
- Cleveland County homestead exemption page
- Canadian County: how property tax is figured (12% ratio, due dates)
- Canadian County homestead exemption page
- Canadian County senior valuation freeze
- OTC Form 921 Homestead Exemption (2026–2027)
- OTC Form 994 Valuation Limitation / Additional Homestead (2026)
- OTC 2026 maximum income for property valuation limitation
- OTC Form 974 Informal Protest (Oklahoma County copy)
- Oklahoma Constitution Art. X §8B (valuation cap)
- 68 O.S. §2876 (valuation notices and protests)
- FEMA Flood Map Service Center
- U.S. Census Bureau Geocoder (address location, county, place and school district)
- Oklahoma County GIS Hub: Tax Parcels Public layer (tax district by parcel)
- Canadian County Public GIS Data: Parcel Data (Public) layer (tax area by parcel)
- City of Norman public Parcels layer (Cleveland County tax district code, Norman area)
- Cleveland County parcels, November 2021 snapshot published by the City of Norman (county-wide tax district group by parcel)
Data last verified against official sources: October 16, 2026.