| 911 Emergency | | 911 |
| Adventure Park USA | | 301-865-6800 |
| Allegheny Power | | 800-255-3443 |
| Animal Control Center | | 301-694-1546 |
| | after hours | | 301-694-1544 |
| Appraiser | Briggs & Associates | | 301-447-3110 |
| | Six & Associates | | 301-694-5626 |
| Assessments | | 301-694-2040 |
| Board of Education | | 301-644-5000 |
| C. Burr Artz Library | | 301-694-1630 |
| City Cab | | 301-662-2250 |
| Comcast Cable | | 888-266-2278 |
| County Commissioners | | 301-694-1100 |
| Department on Aging | | 301-694-1605 |
| Detention Center | | 301-694-2550 |
| Development Commission | | 800-248-7296 |
| Economic and Community | | 301-694-1058 |
| Family Partnership | | 301-846-2206 |
| Fed Ex | | 800-463-3339 |
| Frederick Area Bridal Network | | 301-698-2650 |
| Frederick City Water & Sewer | | 301-694-1421 |
| Frederick Community College | | 301-846-2400 |
| Frederick County Board of Education | | 301-644-5000 |
| Frederick County Circuit Court | | 301-694-1976 |
| Frederick County Employment Opportunities | | 301-600-9000 |
| Frederick County Office of Permits | | 301-631-2313 |
| Frederick County Public Library | | 301-694-1630 |
| Frederick County Sheriff | | 301-694-1046 |
| Frederick County Waste Department | | 301-694-1848 |
| Frederick County Water & Sewer | | 301-694-1126 |
| Frederick Gas | | 301-662-2151 |
| Frederick Magazine | | 301-662-8399 |
| Frederick Memorial Hospital | | 240-566-3300 |
| Frederick News Post | | 301-662-1177 |
| Frederick Police Department | | 301-694-2100 |
| Frederick.com | | 301-514-3901 |
| Health Services | Information | | 301-694-1029 |
| Heating & Air Conditioning | Frederick Air, Inc | | 301-663-0300 |
| Hood College | | 301-663-3131 |
| Hotline Numbers | AIDS Hotline | | 800-342-2437 |
| | Alcoholics Anonymous | | 301-662-0544 |
| | Ambulance Emergency | | 301-662-7655 |
| | Crisis Intervention Hotline | | 301-662-2255 |
| | Maryland Poison Center | | 800-492-2414 |
| | Narcotics Anonymous | | 301-662-3263 |
| | Parents Stressline | | 301-662-2255 |
| | Runaway Hotline | | 800-231-6946 |
| | Substance Abuse Center | | 301-694-1780 |
| | Suicide Crisis Line | | 301-662-2255 |
| Human Relations | | 301-694-1109 |
| Human Resources | | 301-694-1070 |
| Job Training Agency | | 301-846-2255 |
| Landfill | | 301-694-1848 |
| Locksmith | Gene's Lock Service | | 301-662-1280 |
| Maryland Motor Vehicle Administration | | 800-950-1682 |
| Maryland State Police | | 301-644-4151 |
| Mount Saint Mary's University | | 301-447-6122 |
| Parks and Recreation | | 301-694-1646 |
| Permits and Inspections | | 301-631-2313 |
| Planning and Zoning | | 301-694-1134 |
| Public Storage | | 877-788-2028 |
| Radon Testing | Ed Sanbower | | 301-676-5351 |
| Recycling | | 301-696-2960 |
| Register of Wills | | 301-663-3722 |
| Social Services | | 301-694-4555 |
| Substance Abuse Center | | 301-694-1780 |
| Termite Inspector | Advanced Pest Control | | 877-724-7241 |
| Title/Settlement Co. | Signature Settlements | | 301-695-1235 |
| TransIT Service of Frederick County | | 301-694-2065 |
| Uhaul | | 800-468-4285 |
| UPS | | 800-742-5877 |
| US Postal Service | | |
| Verizon | | 301-954-6260 |
| Voice/TDD Numbers | C. Burr Artz Library | | 301-631-3787 |
| | County Commissioners | | 301-694-1100 |
| | Fire and Ambulance Emergency | | 911 |
| | Frederick County Personnel | | 301-694-1070 |
| | Frederick County Police Emergency | | 911 |
| | Frederick County Recreation | | 301-694-2936 |
| Wall Street Journal | | 800-975-8609 |
| We Sell It 4U on eBay | | 301-695-3229 |
| Well & Septic Testing | Advanced Pest Control | | 877-724-7241 |
