The various districts as set forth in this chapter and their boundaries are shown on the “Official Zoning District Map” of the City, which is on file in the office of the Clerk, and which, with all amendments, changes and extensions thereof and all legends, symbols, notations, dimensions, references and all other matters shown thereon, is a part of this chapter. There is only one “Official Zoning District Map.” It is attested by the original signatures of the Mayor and Clerk. All copies or reproductions thereof are junior thereto. The boundaries of the various districts established by this chapter are street lines, alley lines, property lines, lot lines, or other lines shown on the Official Zoning District Map. Where boundaries are approximately indicated as property or lot lines, the true locations of such lines shall be taken as boundary lines. Where the distance to any boundary line from a street line, property line or lot line is indicated by a dimension on the Official Zoning Map, such measurement shall control. The City is divided into districts known as:

      A-1   Agricultural

      R-1   Single-Family Residential

      R-2   Two-Family Residential

      R-3   Multiple-Family Residential

      M-1   Mobile Home Residential

      PUD   Planned Unit Development

      C-1   Central Business District

      C-2   General Commercial District

      C-3   Central Business Implement District

      I-1   General Industrial District

      1-2   Heavy Industrial District

All territory hereafter annexed to the City shall be classified R-1 until such classification is subsequently changed by an action of the Planning and Zoning Commission and the Council.