There are only 59 counties in the whole United States that produce half of U.S. milk, according to the USDA. 

When we look at 25% of the milk production, the number drops significantly. There are only 13 counties that produce 25% of United States milk. Eight of those counties are in California.

1. Tulare, California
2. Merced, California
3. Kings, California
4. Kern, California
5. Stanislaus, California
6. Weld, Colorado
7. Fresno, California
8. Yakima, Washington
9. Maricopa, Arizona
10. Hartley, Texas
11. San Joaquin, California
12. Lancaster, Pennsylvania
13. Madera, California