Okla. Stat. tit. 70, § 70-615: Basis of apportionment

The apportionment shall be made to the school districts of the

county on the basis of school population as determined pursuant to

the provisions of Section 56 of this act for the preceding school

year as certified by the State Board of Education. The

Commissioners of the Land Office, in distributing all funds

mentioned in this section, shall draw their order on the State

Treasurer or other officer having custody of such funds, in favor of

the schools of the counties respectively, entitled to school monies,

using electronic funds transfer as defined by the Office of the

Oklahoma State Treasurer: Provided, that the federal appropriation

made shall be apportioned by said Commissioners, to the several

schools, entitled to the same under Act of Congress providing for

said appropriation, in proportion to the number of children of

school age shown by the last federal census.