Active Colorado Local Governments as of November 19, 2009 (18 local governments in Costilla County)
| District Name and Address | LG_ID | Type |
| Blanca, Town of
PO Box 190 Blanca, CO 81123 |
12001 | 5 |
| Blanca/Fort Garland Metropolitan District
PO Box 310 Blanca, CO 81123 |
12002 | 6 |
| Centennial R-1 School District
PO Box 350 San Luis, CO 81152 |
12900 | 99 |
| Costilla Conservation District
PO Box 91 San Luis, CO 81152 |
12006 | 20 |
| Costilla County
PO Box 100 San Luis, CO 81152-0100 |
12003 | 1 |
| Costilla County Ambulance District
PO Box 388 San Pablo, CO 81153 |
12012 | 45 |
| Costilla County Conservancy District
PO Box 42 San Luis, CO 81152 |
12004 | 43 |
| Costilla County Fire Protection District
PO Box 419 San Luis, CO 81152 |
12005 | 8 |
| Costilla County Housing Authority
PO Box 1029 San Luis, CO 81152 |
12011 | 32 |
| Fort Garland Water & Sanitation District
PO Box 309 Fort Garland, CO 81133 |
12007 | 12 |
| Groundwater Management Subdistrict of the Trinchera Water Conservancy District
PO Box 145 Blanca, CO 81123 |
66169 | 18 |
| San Luis Valley Emergency Telephone Service Authority
1205 West Avenue c/o Colorado State Patrol Alamosa, CO 81101 |
64222 | 60 |
| San Luis Valley GIS/GPS Authority
419 San Juan Avenue Alamosa, CO 81101 |
64227 | 47 |
| San Luis Water & Sanitation
PO Box 86 San Luis, CO 81152 |
12008 | 12 |
| San Luis, Town of
PO Box 200 Office of The Town Clerk San Luis, CO 81152 |
12009 | 5 |
| Sierra Grande R-30 School District
17523 Highway 160 Blanca, CO 81123 |
12901 | 99 |
| Spanish Peaks-Purgatoire River Conservation District
3590 E. Main Street Trinidad, CO 81082-5002 |
64224 | 20 |
| Trinchera Water Conservancy District
PO Box 145 Blanca, CO 81123 |
12010 | 18 |
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