Okla. Stat. tit. 47, § 47-1-106: Business district

The territory contiguous to and including a highway when within

any six hundred (600) feet along such highway there are buildings in

use for business or industrial purposes, including but not limited

to hotels, banks, or office buildings, railroad stations and public

buildings which occupy at least three hundred (300) feet of frontage

on one side or three hundred (300) feet collectively on both sides

of the highway.