The City Council may from time to time amend, supplement, or change by ordinance the boundaries of the districts or the regulations herein established. A public hearing shall be held by the City Council before adopting any proposed amendment, supplement, or change, notice of which hearing shall be given by publication one (1) time in the official paper of the City of Blue Mound, stating the time and place of such hearing, which time shall not be earlier than fifteen (15) days from the date of publication.

Written notice of all public hearings on proposed changes in classification shall be sent to all owners of property or to the person rendering the same for City taxes, affected by such proposed changes of classification, and to all owners of property, or to the person rendering the same for City taxes, located within two hundred feet (200') of any property affected thereby, within not less than ten (10) days before such hearing is held. Such notice may be served by using the last known address as listed on the City tax roll and depositing the notice, postage paid, in the United States Post Office. This shall also be the method of notice for all public hearings of the Board of Adjustment.

If a protest against an amendment, supplement, or change has been filed with the City Secretary, duly signed and acknowledged by the owners of twenty (20) percent or more, either of the area of the lots included in such proposed changes or all property within two hundred feet (200') of all boundaries of the proposed change, such amendment, supplement, or change shall not become effective except by a favorable vote of three-fourths (3/4) of all members of the City Council.