| State | District | Founded | Notes |
|---|
| California | Fresno Irrigation District | 1920 | Distribution canals in the Fresno County |
| California | Imperial Irrigation District | 1911 | Distribution canals in the Imperial Valley |
| California | Turlock Irrigation District | 1887 | First Irrigation District in California |
| California | Merced Irrigation District | 1919 | Distribution canals in the Merced County |
| California | Nevada Irrigation District | 1921 | Nevada County and portions of Placer and Yuba Counties |
| California | South San Joaquin Irrigation District | 1909 | Southern San Joaquin County |
| California | Westlands Water District | 1952 | San Joaquin, Kings, and Fresno Counties |
| Nevada | Truckee–Carson Irrigation District | 1918 | Supports agriculture in Lyon County and Churchill County |
| New Mexico | Carlsbad Irrigation District | 1949 | Declared a National Historic Landmark in 1964 |
| New Mexico | Middle Rio Grande Conservancy District | 1925 | Rio Grande in the Albuquerque Basin section |
| Ohio | Miami Conservancy District | 1914 | Great Miami River and its tributaries |
| Ohio | Muskingum Watershed Conservancy District | 1933 | Muskingum River Watershed |
| Oregon | Central Oregon Irrigation District | 1918 | Provides irrigation water for Central Oregon |
| Oregon | Tumalo Irrigation District | 1922 | Provides irrigation water for Tumalo |
| Utah | Jordan Valley Water Conservancy District | 1951 | Mainly operates in Salt Lake County. [3] Called Salt Lake County Water Conservancy District until 1999 |
| Washington | Quincy-Columbia Basin Irrigation District | 1910 [4] | Delivers irrigation water to farmland in the Columbia Basin |