As of May 4, 2016 (PDF), The Libertarian Party of Oklahoma has 676 registered members in the state. Oklahoma, Tulsa, Cleveland, and Canadian counties make up the top 4 counties with 192, 126, 71, and 35 registrants respectively.
There are nine counties with registrations between 10-19 Libertarians. There are twenty-one counties with no Libertarians. The other 43 counties have Libertarian registrations in the single digits.
It is tough to make a one to one comparison between these numbers and the last time the Libertarian Party was officially recognized in 2000 as the Oklahoma Election Board did not keep registration records between the January 15 reports in 2000 and 2001. In January 2001, the Libertarian Party had 770 registered members.
Other statistics of note, the American Elect Party still has members but lost one since January, for a total of 12. Registrants for the Democrats, Republicans and Independents all gained in numbers. The Republican party gained the most registrations in the last 4 months.