In order to carry out the purposes and provisions of this title, the city and adjacent territory within one and one-half miles of the corporate boundaries of the city is divided into the following districts:
A - 1 Agricultural
R - 1 Single-family residence
R - 2 Two-family residence
R - 3 Multiple family residence
B - 1 Commercial
I - 1 Light industrial
I - 2 Heavy industrial
I - 3 Hazardous industrial
M - 1 Mobile home
(Ord. 81-11 Art. III § 1, 1980).