| Business | Phone |
| Douglas County Assessor 301 Wilcox St, Castle Rock 80104 | (303) 660-7450 |
| Douglas County Sales Tax Info 100 3rd St, Castle Rock 80104 | (303) 660-7340 |
| Douglas County Treasurer 100 3rd St # 120, Castle Rock 80104 | (303) 660-7455 |
| Douglas County Treasurer 301 Wilcox St, Castle Rock 80104 | (303) 660-7455 |