First, it is important to note that some animals can only be hunted during specific seasons in Oklahoma.
That said, hunting without a license could cost you a lot. Residents and non-residents alike are required to buy a hunting license to, at least, support the Wildlife Department.
Special licenses are offered to senior residents, military personnel and people with disabilities. The state of Oklahoma, in general, offers different types of hunting licenses for residents, including a lifetime license and a five-year license.
You can get your license from one of the 700 approved vendors or the Oklahoma Outdoors website.