Code of Alabama
Chapter 6 - Airport Zoning.
Section 4-6-4 - Authority of Counties and Municipalities to Adopt Regulations; Zoning Jurisdiction of Counties and Municipalities.

(a) Counties. - In order to prevent the creation or establishment of airport hazards, any county having an airport hazard area within its zoning jurisdiction, as hereinafter defined, may adopt, administer and enforce, under the police power and in the manner and upon the conditions hereinafter prescribed, airport zoning regulations for such airport hazard area, which regulations may divide such area into zones, and within such zones specify the land uses permitted and regulate and restrict the height to which structures and trees may be erected or allowed to grow.
The zoning jurisdiction of the county is hereby declared to be all unincorporated areas in the county, except within the police jurisdiction of any municipality and the area within two miles of an airport owned or operated by a municipality when said municipality exercises or declares its intention to exercise zoning control over these areas; provided, that when by local acts the jurisdiction of zoning regulations is limited to the corporate limits of a city, this chapter shall not confer any further territorial jurisdiction on such city or its planning board or boards.
(b) Municipalities. - Any municipality having an airport hazard area within its zoning jurisdiction, as herein defined, is hereby granted the same powers contained in subsection (a) of this section.
The zoning jurisdiction of any municipality, zoning under the authority of this chapter, may include, in addition to the corporate area of said municipality, the area within the police jurisdiction of such municipality and the area lying within two miles of the boundary of any airport owned or operated by said municipality; except, that where a local act limits the territorial jurisdiction of a city planning board to the corporate limits of a city, this chapter limits zoning jurisdiction to such corporate limits.
The provisions of this section shall not apply to counties having a population of not less than 54,500 nor more than 56,000 according to the most recent federal decennial census.

Structure Code of Alabama