Okla. Stat. tit. 11, § 11-36-220: Notice of maturity of installments

A. The municipal clerk shall, not less than thirty (30) days

and not more than forty (40) days before the maturity of any

installment of an assessment, publish in two (2) successive issues

of a daily newspaper, or in one (1) issue of a weekly newspaper,

which is of general circulation in the municipality, a notice which:

1. Advises the owners of the land affected by the assessment of the

date when the installment and interest will be due;

2. Designates the street, streets, or other public places for

the improvement of which the assessments have been levied; and

3. States that unless the installment and interest shall be

promptly paid, the installment and interest shall bear interest at

the rate of twelve percent (12%) per annum thereafter until paid,

and that proceedings will be taken according to law to collect the

installment and interest.

B. In addition to publication of the notice of maturity of

installments, the municipality may also notify each owner of land

affected by the assessment at his address as shown on the Assessment

Record by mailing a postal card directly to the owner reciting the

facts contained in the published notice, or by mailing to the owner

a copy of the newspaper publication.