**Exhibit 21.1**

 

**List of Significant Subsidiaries of Copano Energy, L.L.C. (as of March 28,2005)**

 
| **Name**                                        | ** ** | **Jurisdiction of Formation** |
|-------------------------------------------------|------------|-------------------------------|
| ** **                                      | ** ** | ** **                    |
| Copano Pipelines Group,  L.L.C.                 |       | Delaware                      |
|                                            |       |                          |
| Copano Houston Central,  L.L.C.                 |       | Delaware                      |
|                                            |       |                          |
| Copano Field  Services/Copano Bay, L.P.         |       | Texas                         |
|                                            |       |                          |
| Copano Field  Services/South Texas, L.P.        |       | Texas                         |
|                                            |       |                          |
| Copano Field Services/Agua  Dulce, L.P.         |       | Texas                         |
|                                            |       |                          |
| Copano Field  Services/Central Gulf Coast, L.P. |       | Texas                         |
|                                            |       |                          |
| Copano Field  Services/Karnes, L.P.             |       | Texas                         |
|                                            |       |                          |
| Copano Field  Services/Upper Gulf Coast, L.P.   |       | Texas                         |
|                                            |       |                          |
| Copano Field Services/Live  Oak, L.P.           |       | Texas                         |
|                                            |       |                          |
| Copano Pipelines/South  Texas, L.P.             |       | Texas                         |
|                                            |       |                          |
| Copano Pipelines/Upper  Gulf Coast, L.P.        |       | Texas                         |
|                                            |       |                          |
| Copano  Pipelines/Hebbronville, L.P.            |       | Texas                         |
|                                            |       |                          |
| Copano Pipelines/Texas  Gulf Coast, L.P.        |       | Texas                         |
|                                            |       |                          |
| Copano Energy  Services/Upper Gulf Coast, L.P.  |       | Texas                         |
|                                            |       |                          |
| Copano Energy  Services/Texas Gulf Coast, L.P.  |       | Texas                         |
|                                            |       |                          |
| Copano NGL Services, L.P.                       |       | Texas                         |
|                                            |       |                          |
| Copano Processing, L.P.                         |       | Texas                         |
|                                            |       |                          |
| Copano/Webb-Duval  Pipeline, L.P.               |       | Delaware                      |
|                                            |       |                          |
| CPNO Services, L.P.                             |       | Texas                         |

 

----