Part Ⅰ．New England(6 States)新英格兰地区 1
Part Ⅱ．Middle Atlantic States(6 States)中部大西洋地区 27
Part Ⅲ．The Middle West States(12 States)中西部地区 55
Part Ⅳ．The Southern States(13 States)南方地区 109
Part Ⅴ．The Mountainous States(8 States)西部山区 169
Part Ⅵ．The Pacific States(5 States)太平洋沿岸地区 199
Part Ⅶ．District of Columbia哥伦比亚特区 220