different picture from any groupings of States because most of the topographic divisions subdivide States and comprise portions of several States. Delaware, Iowa, Nevada, and the six New England States are the only States that appear in their entirety within their division. Figure 6-5 shows the 19 topographic divisions delineated for the 1900 population census report, and lists the number of counties and statistically equivalent entities in each division.
Figure 6-5. 1900 Census Topographic Divisions Based on Physiography
Number of Counties in Each Topographic Division
| New England Hills | 91 |
| Coast Lowlands | 99 |
| Coastal Plain (east of Mississippi River) | 278 |
| Piedmont Region | 189 |
| Appalachian Valley | 129 |
| Allegheny Plateau | 181 |
| Lake Region | 223 |
| Interior Timbered Region | 293 |
| Mississippi Alluvial Region | 60 |
| Prairie Region | 614 |
| Ozark Hills | 59 |
| Coastal Plain (west of Mississippi River) | 110 |
| Great Plains | 227 |
| Rocky Mountains | 73 |
| Columbian Mesas | 37 |
| Great Basin | 45 |
| Plateau Region | 32 |
| Pacific Valley | 57 |
| Coast Ranges | 31 |
Total Counties and Statistically Equivalent Entities in the Continental United States: 2,828
Statistical Groupings6-15
