For the purpose of this Chapter, the City of St. John, Missouri, is divided into the following Zoning Districts:

Zoning Map. The boundaries of these districts are hereby established as shown on "St. John Zoning Map" which accompanies and is hereby declared to be a part of this Chapter. All district classifications, however, need not appear on the Zoning Map at one time. Said map, with all subsequent amendments thereto, supersedes all prior zoning maps of the City. Official copies of said map shall be maintained in the Office of the City Clerk and the Director of Public Works and shall be public record. All subsequent amendments to the Zoning Map shall be designated on said official copies. The Director of Public Works may, at his discretion, cause the "St. John Zoning Map" and its official copies thereof to be photographed, microphotographed, photostated or reproduced on film. Said maps, when so reproduced, shall be deemed to be an original record for all purposes.

The Board of Adjustment shall interpret the provisions of this Chapter. Any area within the geographical boundaries of the City of St. John, Missouri, which is added to or becomes a part of the City shall be in the "R-1" Residence District classification until changed by ordinance designating another district classification to such area.

Where uncertainty exists with respect to the boundaries of the various districts as shown on the Zoning Map, the following rules shall apply:

Whenever any street, alley, or other public way is vacated by the City Council of the City of St. John, Missouri, the St. Louis County Council, or the State of Missouri, the zoning districts adjoining or on each side of such street, alley, or public way shall automatically be extended to the centerline of such vacation and all area included in the vacation shall then be subject to all applicable regulations of the extended districts.