(a) For the purpose of allotment and assignment, the United States is divided into three zones as follows:
(1) Zone I consists of that portion of the United States located within the confines of the following lines drawn on the U.S. Albers Equal Area Projection Map (based on standard parallels 29\1/2\[deg] and 45\1/2\[deg]; 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 37[deg]49[min] and west longitude 80[deg]12[min]30[sec]; 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 43.5[deg] parallel; thence east along this parallel to the United States-Canada border; thence southerly and following that border until it again intersects the 43.5[deg] 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 Sec. 73.699.)
(2) Zone II consists of that portion of the United States which is not located in either Zone I or Zone III, and Puerto Rico, Alaska, Hawaiian Islands and the Virgin Islands.
(3) Zone III consists of that portion of the United States located south of a line, drawn on the United States Albers Equal Area Projection Map (based on standard parallels 29.50 and 45.50 North American datum), beginning at a point on the east coast of Georgia and the 31st parallel and ending at the United States-Mexican border, consisting of arcs drawn with a 241.4 kilometer (150 mile) radius to the north from the following specified points: ------------------------------------------------------------------------
North West
(a)......................................... 29[deg]40[mi 83[deg]24[mi
n]00[sec] n]00[sec](b)......................................... 30[deg]07[mi 84[deg]12[mi
n]00[sec] n]00[sec](c)......................................... 30[deg]31[mi 86[deg]30[mi
n]00[sec] n]00[sec](d)......................................... 30[deg]48[mi 87[deg]58[mi
n]00[sec] n]30[sec](e)......................................... 30[deg]00[mi 90[deg]38[mi
n]00[sec] n]30[sec](f)......................................... 30[deg]04[mi 93[deg]19[mi
n]30[sec] n]00[sec](g)......................................... 29[deg]46[mi 95[deg]05[mi
n]00[sec] n]00[sec](h)......................................... 28[deg]43[mi 96[deg]39[mi
n]00[sec] n]30[sec](i)......................................... 27[deg]52[mi 97[deg]32[mi
n]30[sec] n]00[sec]------------------------------------------------------------------------
When any of the above arcs pass through a city, the city shall be considered to be located in Zone II. (See Figure 2 of Sec. 73.699.) [28 FR 13660, Dec. 14, 1963, as amended at 33 FR 15422, Oct. 17, 1968; 50 FR 23697, June 5, 1985; 51 FR 44070, Dec. 8, 1986]