| Addiction Recovery Centers (Broadway) | Public Health | 303-441-1275 | | |
| Addiction Recovery Centers (Longmont Site) | Public Health | 303-678-6166 | | |
| Addiction Recovery Centers (Valmont/Detox) | Public Health | 303-441-1281 | | |
| Administration | Sheriff | 303-441‑4605 | | |
| Administration (Public Health) | Public Health | 303-441-1100 | | |
| Administrative Services | Administrative Services | 303-441-3525 | | |
| Adolescent Services | Housing and Human Services | 303-441-1000 | | |
| Adopt-A-County Road | Transportation | 303-441-3900 | | |
| Adoption & Foster Care | Housing and Human Services | 303-441-1089 | | |
| Adult Protection | Housing and Human Services | 303-441-1000 | | |
| Air Quality Program | Public Health | 303-441-1564 | | |
| Alcohol Diversion Program | Public Health | 303-413-7547 | | |
| All Emergency Calls | Sheriff | 911 | | |
| Allenspark Transfer Station and Recycling Center | Administrative Services | 303-747-2107 | | |
| Alternative Modes | Transportation | 720-564-2665 | | |
| Animal Control Administration | Sheriff | 303-441‑3626 | | |
| Animal Control to request animal Control Response | Sheriff | 303-441‑4444 | | |
| Assessor's Office | Assessor | 303-441-3530 | | |
| Bad Check Program | District Attorney | Toll Free 1-866-292-3584 | | |
| BEST Program | Community Services | 303-441-3661 | | |
| Bids and Contracts | Administrative Services | 303-441-3525 | | |
| Birth and Death Certificates (Vital Records) | Public Health | 303-441-1100 | | |
| Board of County Commissioners |
Commissioners' Office | 303-441-3500 | | |
| Board of Equalization | Administrative Services | 303-441-4590 | | |
| Body Art Program | Public Health | 303-441-1564 | | |
| Boston Site (Longmont) | Public Health | 303-678-6164 | | |
| Boulder County Prevention Connection | Community Services | 303-441-3839 | | |
| Boulder County Public Trustee | Public Trustee | 303-443-3636 | | |
| Budget Office |
Commissioners' Office | 303-441-4506 | | |
| Building Permits and Inspection | Land Use | 303-441-3925 | | |
| Building Services | Administrative Services | 303-441-3525 | | |
| Bus Stop Enhancement | Transportation | 303-441-4958 | | |
| Business Sustainability Program | Public Health | 303-441-1564 | | |
| Child Abuse and Neglect | Housing and Human Services | 303-441-1000 | | |
| Child Health Promotion (CHP) | Public Health | 303-413-7500 | | |
| Child Support | Housing and Human Services | 303-678-6300 | | |
| Children with Special Needs Program (CSN) | Public Health | 303-413-7500 | | |
| Civil Division | Sheriff | 303-441‑3608 | | |
| Clerk and Recorder's Office | Clerk and Recorder | 303-413-7700 | | |
| Code Enforcement | Land Use | 303-441-3930 | | |
| Coffman Site (Longmont) | Public Health | 303-678-6166 | | |
| Communicable Disease Control Program | Public Health | 303-413-7500 | | |
| Communications Program | Public Health | 303-441-1457 | | |
| Community Health (Boulder) | Public Health | 303-413-7500 | | |
| Community Health (Longmont) | Public Health | 303-678-6166 | | |
| Community Infant Program (CIP) | Public Health | 303-661-0433 *868 | | |
| Community Services | Sheriff | 303-441-3650 | | |
| Coroner's Office | Coroner | 303-441-3535 | | |
| CSU Cooperative Extension Office | Parks and Open Space | 303-678-6238 | | |
| Detective Division | Sheriff | 303-441‑3650 | | |
| Elections | Clerk and Recorder | 303-413-7740 | | |
| Emergency Preparedness Program | Public Health | 303-413-7500 | | |
| Emergency TDD (For Use by Deaf) | Sheriff | 911 | | |
| Environmental Health | Public Health | 303-441-1564 | | |
| Evidence‑Property | Sheriff | 303-441‑3629 | | |
| Fairgrounds | Parks and Open Space | 303-678-6235 | | |
| Family Health (Boulder) | Public Health | 303-413-7500 | | |
| Family Health (Longmont) | Public Health | 303-678-6166 | | |
| Financial and Food Assistance | Housing and Human Services | 303-441-1000 | | |
| Financial Services | Administrative Services | 303-441-3525 | | |
| Floodplain Information | Transportation | 720-564-2659 | | |
| Food Safety Program | Public Health | 303-441-1564 | | |
| Forest Health - Private Land | Land Use | 720-564-2641 | | |
| Fraud Investigations | Housing and Human Services | 303-682-6790 | | |
| GENESIS Program | Public Health | 303-413-7529 | | |
| GENESISTER Program | Public Health | 303-678-6139 | | |
| Hazardous Materials Management Facility | Administrative Services | 720-564-2251 | | |
| Health Planning | Public Health | 303-441-1167 | | |
| HIV/STI Outreach Program | Public Health | 303-413-7500 | | |
| Housing Counseling | Housing and Human Services | 720-564-2279 | | |
| Human Resources (Public Health Only) | Public Health | 303-441-1100 | | |
| Human Resources/Jobs | Administrative Services | 303-441-3525 | | |
| Immunization Program | Public Health | 303-413-7500 | | |
| Information Technology | Administrative Services | 303-441-3525 | | |
| Information‑Records | Sheriff | 303-441‑3600 | | |
| Investigation | District Attorney | 303-441‑3700 | | |
| Jail Inmate Visitation | Sheriff | 303-441‑4600 | | |
| Justice System Volunteers | Community Services | 303-441‑3718 | | |
| Juvenile Center | Community Services | 303-441‑3978 | | |
| Laboratory Services | Public Health | 303-413-7426 | | |
| Lafayette Site | Public Health | 720-564-2706 | | |
| Land Use GIS | Land Use | 303-441-3930 | | |
| Local Improvement District | Transportation | 720-564-2655 | | |
| Longmont Probation Office | Courts | 720-564-2555 | | |
| Longmont Site | Public Health | 303-678-6131 | | |
| Long-Term Care Ombudsman | Community Services | 303-441-3199 | | |
| Medicare Ombudsman (Bilingual) | Community Services | 303-678-6113 | | |
| Mobility 4 All | Transportation | 303-441-3906 | | |
| Motor Vehicle | Clerk and Recorder | 303-413-7710 | | |
| Nederland Transfer Station and Recycling Center | Administrative Services | 303-258-7878 | | |
| Neighborhood and Small Business Eco Pass | Transportation | 303-441-4958 | | |
| Non‑Emergency Requests For Sheriff's Dept. Response | Sheriff | 303-441‑4444 | | |
| Nurse-Family Partnership (NFP) | Public Health | 303-413-7554 | | |
| OASOS Program | Public Health | 303-678-6259 | | |
| Parks and Open Space | Parks and Open Space | 303-678-6200 | | |
| Patrol Division | Sheriff | 303-441‑3650 | | |
| Personnel | Sheriff | 303-441‑3638 | | |
| Planning - Development Review Team | Land Use | 303-441-3930 | | |
| Planning - Long Range | Land Use | 303-441-3930 | | |
| Project Self-Sufficiency | Community Services | 303-441-3987 | | |
| Prosecution | District Attorney | 303-441-3700 | | |
| Radon Program | Public Health | 303-441-1564 | | |
| Recording | Clerk and Recorder | 303-413-7770 | | |
| Records Division | Sheriff | 303-441‑3600 | | |
| Recycling Center | Administrative Services | 720-564-2220 | | |
| Resource Conservation | Administrative Services | 720-564-2220 | | |
| Risk Management | Administrative Services | 303-441-3801 | | |
| Road Maintenance | Transportation | 303-441-3962 | | |
| Sales and Use Tax/Financial Services | Administrative Services | 303-441-3525 | | |
| Sexual Abuse Team | Housing and Human Services | 303-441-1000 | | |
| Special Event Permits (Roads) | Transportation | 303-441-4581 | | |
| Sundquist Site (Boulder) | Public Health | 303-413-7500 | | |
| Tobacco Education & Prevention Partnership | Public Health | 303-413-7567 | | |
| Transportation Engineering and Planning | Transportation | 303-441-3900 | | |
| Treasurer's Office | Treasurer | 303-441-3520 | | |
| Tuberculosis (TB) Program | Public Health | 303-413-7500 | | |
| Vector Control Program | Public Health | 303-441-1564 | | |
| Victim Assistance | Sheriff | 303-441-3656 | | |
| Victim Witness Assistance | District Attorney | 303-441-3700 | | |
| Volunteer Services | Public Health | 303-441-1163 | | |
| Warrants Division | Sheriff | 303-441‑3644 | | |
| Water Quality Program | Public Health | 303-441-1564 | | |
| Wellness Services | Community Services | 303-441-4995 | | |
| Wildfire Mitigation - Private Land | Land Use | 303-441-3930 | | |
| Women, Infants, & Children Program (WIC) Boulder | Public Health | 303-413-7520 | | |
| Women, Infants, & Children Program (WIC) Lafayette | Public Health | 720-564-2213 | | |
| Women, Infants, & Children Program (WIC) Longmont | Public Health | 303-678-6130 | | |
| Youth Corps | Parks and Open Space | 303-678-6104 | | |
| Youth Risk Behavior Survey (YRBS) | Public Health | 303-441-1530 | | |