1.a. Atlantic Seabord
1.b. Lower Great Lakes
2. California Region
3. Florida Peninsula
4. Gulf Coast
5. East Central Texas-Red River
6. Southern Piedmont
7. North Georgia-South East Tennessee
8. Puget Sound
9. Twin Cities Region
10. Colorado Piedmont
11.. Saint Louis
12. Metropolitan Arizona
13. Wiltamette Valley
14. Central Oklahoma- Arkansas Valley
15. Missouri-KawValley
16. North Alabama
17. Blue Grass
18. Southern Coastal Plain
19. Salt Lake Valley
20. Central Illinois
21. Nashville Region
22. East Tennessee
23. Oahu Island
24. Memphis
25. El Paso-Ciudad Juarez
Based on 2-child family projection
Source: Jerome P. Pickard, "U.S. Metropolitan Growth and Expansion, 1970-2000, with Population Projections" (prepared for the Commission, 1972).