| Name | Address, Zip |
| East Boulder Ditch Company The 1155 Canyon Boulevard | Po Box 119, 80502-0119 |
| Enterprise Irrigating Ditch Company 1155 Canyon Blvd | Po Box 119, 80502-0119 |
| Boulder And Weld Reservoir Company | Po Box 1826, 80502-1826 |
| Davidson Ditch And Reservoir Company | Po Box 119, 80502-0119 |
| Leggett Ditch And Reservoir Company | Po Box 1292, 80502-1292 |
| Baugh Lateral Ditch & Reservoir Company | 4309 State Highway 66, 80504-9629 |
| West Blower Water Users Group Inc | 15415 N 83rd St, 80503-9218 |
| Wr Blower Ditch Company Inc | 15415 N 83rd St, 80503-9218 |
| Bonus Ditch Company | Po Box 771, 80502-0771 |
| South Boulder Canon Ditch Company | Po Box 119, 80502 |
| Boulder & Weld County Ditch Company | Po Box 119, 80502-0119 |
| South Branch Company | Po Box 119, 80502-0119 |
| Last Chance Ditch Co | Po Box 119, 80502-0119 |
| Pleasant Valley Reservoir Fish & Ditch Co | Po Box 119, 80502-0119 |
| Godding Ditch Co | Po Box 119, 80502-0119 |
| Lake Ditch Co | 4358 Hygiene Rd, 80503-9164 |
| Culver Lateral Ditch Co | Po Box 119, 80502-0119 |
| Smith & Emmons Ditch Co | Po Box 119, 80502-0119 |
| Lower Oligarchy Ditch Co | Po Box 119, 80502-0119 |
| Oligarchy Irrigation Company | Po Box 119, 80502-0119 |
| Rough & Ready Irrigating Ditch Company | Po Box 119, 80502 |
| Mckay Lateral Ditch Company | P O Box 119, 80502 |
| Longmont Supply Ditch Company | Po Box 119, 80502 |
| James Ditch Company | Po Box 119, 80502-0119 |
| Niwot Ditch Company | Po Box 771, 80502-0771 |
| Farmers Ditch Company | Po Box 119, 80502-0119 |
| South Tollgate Ditch Company | 4601 Oxford Rd, 80503-8804 |
| Terry Lateral Ditch Company | Po Box 119, 80502-0119 |
| Oligarchy Extension Ditch Company | Po Box 119, 80502-0119 |
| Williamson Ditch Company | 7733 N 73rd St, 80503-8744 |
| Eisele Lateral Ditch Company | Po Box 119, 80502-0119 |
| New Hinman Ditch Company | 6766 N 63rd St, 80503-8852 |
| United Water Company | 401 Main St Unit 1, 80501-5578 |
| North Tollgate Ditch Company | Po Box 119, 80502-0119 |
| |