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 | Official name: State of Oklahoma Oklahoma postal code abbreviation: OK You may also be interested in the answers to the following questions: Total area: 181 196 km2 ✅ What is the largest city by population in Oklahoma?- Largest Oklahoma cities by population: Oklahoma City ✅ What is the capital of Oklahoma?- State capital of Oklahoma: Oklahoma City ✅ What is the population of Oklahoma?- Oklahoma state population 2025: 3 791 508 |