| Business | Phone |
| County Recorder 301 Wilcox St, Castle Rock 80104 | (303) 660-7469 |
| Douglas Cnty Marriage License 301 Wilcox St, Castle Rock 80104 | (303) 660-7446 |
| Douglas County Accounting 101 3rd St, Castle Rock 80104 | (303) 660-7430 |
| Douglas County Budget 100 3rd St # 130, Castle Rock 80104 | (303) 660-7433 |
| Douglas County Building 100 3rd St, Castle Rock 80104 | (303) 660-7498 |
| Douglas County Co-Op Extension 410 Fairgrounds Rd, Castle Rock 80104 | (720) 733-6930 |
| Douglas County Comm Justice 4000 Justice Way # 2017, Castle Rock 80109 | (303) 660-7552 |
| Douglas County Commissioners 100 3rd St, Castle Rock 80104 | (303) 660-7401 |
| Douglas County Coroner 4000 Justice Way # 1611, Castle Rock 80109 | (303) 814-7150 |
| Douglas County Coroner 407 Jerry St, Castle Rock 80104 | (303) 814-7150 |
| Douglas County Dog Control 355 S Wilcox St, Castle Rock 80104 | (303) 660-7529 |
| Douglas County Fair Info 500 Fairgrounds Rd, Castle Rock 80104 | (720) 733-6941 |
| Douglas County Gov 100 3rd St, Castle Rock 80104 | (303) 660-7400 |
| Douglas County Human Resources 100 3rd St, Castle Rock 80104 | (303) 660-7427 |
| Douglas County Justice 4000 Justice Way, Castle Rock 80109 | (303) 663-7200 |
| Douglas County License Plates 301 Wilcox St, Castle Rock 80104 | (303) 660-7440 |
| Douglas County Planning 100 3rd St, Castle Rock 80104 | (303) 660-7460 |
| Douglas County Public Trustee 301 Wilcox St, Castle Rock 80104 | (303) 660-7417 |
| Douglas County Risk Management 100 3rd St, Castle Rock 80104 | (303) 660-7425 |
| Douglas County Senior Svc 101 3rd St, Castle Rock 80104 | (303) 660-7519 |
| Douglas County Technology Svc 100 3rd St, Castle Rock 80104 | (303) 660-7464 |
| Douglas County Voter Rgstrtn 301 Wilcox St, Castle Rock 80104 | (303) 660-7444 |
| Liquor License Clerk 100 3rd St, Castle Rock 80104 | (303) 660-7408 |