| Business | Phone |
| Energy Management/Conservation 225 E 16th Ave # 650, Denver 80203 | (303) 894-2383 |
| Telecommunications Division 2452 W 2nd Ave # 19, Denver 80223 | (303) 866-2341 |
| Public Utilities Commission 1580 Logan St, Denver 80203 | (303) 894-2000 |
| Oil & Gas Conservation Comm 1120 Lincoln St # 801, Denver 80203 | (303) 894-2100 |