Every electric power, hydroelectric power, every telegraph, telephone, or long distance telephone company shall include in each return made by it the following particulars:

(1) The number of miles of right-of-way in the state belonging to such company and the number of miles of right-of-way along public roads or on government land or on or along the streets of incorporated cities and towns used by such company, showing the number of miles of each class separately and by what authority such use is granted;

(2) The total length of all transmission lines or telephone or telegraph lines, stated by the number of miles of poles and the number of miles of towers, whether poles are treated or untreated, and description of towers as to size and height, the number of miles of wire, of each material constructed, stated according to the number of miles of each class and size of wire, the number of miles of conduit or of cable, stated according to the number of pairs of wire or other capacity, and the voltage capacity of each electric transmission line shall be stated;

(3) The total length of all lines of said company, whether within or outside of the state; and

(4) The total length of so much of said lines as are within this state and the length of its lines in each of the counties, cities, towns, school districts, or other tax districts of this state into or through which its lines extend, stated according to the number of miles of towers, the number of miles of poles, the number of miles of each class of wire, and the number of miles of each size of conduit or cable. Electric transmission lines shall, in addition to the foregoing state their mileage according to the voltage capacity of each line.