Statewide Delegates: Proportional - the candidates are awarded delegates in proportion to the percentage of votes received. - a 15% threshold is required to receive delegates. Congressional District Delegates: Proportional - the candidates are awarded delegates in proportion to the percentage of votes received. - a 15% threshold is required to receive delegates.
Source for Popular Vote data: Oklahoma State Election Board. Official Results Presidential Preferential March 1, 2016 - For President, Oklahoma State Election Board (https://www.ok.gov/elections/Election_Info/2016_March_PPP_Election.html) (accessed 05 Mar 2016)