Okla. Stat. tit. 47, § 1-154
The territory contiguous to and including a highway not comprising a business district when the property on such highway for a distance of three hundred (300) feet or more is in the main improved with residences or residences and buildings in use for business.
Laws 1961, HB 556, p. 319, § 1-154, eff. September 1, 1961.