Okla. Stat. tit. 69, § 69-653: Numerical designation of section lines - System

The State Highway Department shall numerically designate each

section line in the State of Oklahoma according to the following

system:

The first section line running north and south at the west end

of the State shall be designated NS1, each succeeding section line

shall have the number changed in numerical order, the prefix NS

remaining the same, until a number has been assigned to the last

section line paralleling the Arkansas border. In like manner the

first section line running east and west below the northern border

of Oklahoma shall be designated EW1 and each succeeding section line

shall be changed in numerical sequence, the prefix EW remaining the

same until the last section line north of the Red River has been

designated.