§  73.205   Zones.

   For the purpose of allotments and assignments, the United States is
   divided into three zones as follows:

   (a) Zone I consists of that portion of the United States located within
   the confines of the following lines drawn on the United States Albers
   Equal Area Projection Map (based on standard parallels 291/2DEG and
   451/2DEG; North American datum): Beginning at the most easterly point
   on the State boundary line between North Carolina and Virginia; thence
   in a straight line to a point on the Virginia-West Virginia boundary
   line located at north latitude 37DEG49' and west longitude 80DEG12'30";
   thence westerly along the southern boundary lines of the States of West
   Virginia, Ohio, Indiana, and Illinois to a point at the junction of the
   Illinois, Kentucky, and Missouri State boundary lines; thence northerly
   along the western boundary line of the State of Illinois to a point at
   the junction of the Illinois, Iowa, and Wisconsin State boundary lines;
   thence easterly along the northern State boundary line of Illinois to
   the 90th meridian; thence north along this meridian to the 43.5DEG
   parallel; thence east along this parallel to the United States-Canada
   border; thence southerly and following that border until it again
   intersects the 43.5DEG parallel; thence east along this parallel to the
   71st meridian; thence in a straight line to the intersection of the
   69th meridian and the 45th parallel; thence east along the 45th
   parallel to the Atlantic Ocean. When any of the above lines pass
   through a city, the city shall be considered to be located in Zone I.
   (See Figure 1 of § 73.699.)

   (b) Zone I-A consists of Puerto Rico, the Virgin Islands and that
   portion of the State of California which is located south of the 40th
   parallel.

   (c) Zone II consists of Alaska, Hawaii and the rest of the United
   States which is not located in either Zone I or Zone I-A.

   [ 29 FR 14116 , Oct. 14, 1964, and  31 FR 10125 , July 27, 1966, as amended
   at  48 FR 29504 , June 27, 1983]