| AmeriPath |
| State | City | Street Address | Zip | Telephone |
| FL | Palm Beach Gardens | 7111 Fairway Drive Suite 400 | 33418 | 1 (561) 330-6565 |
| | | | | |
| Athena Diagnostics |
| State | City | Street Address | Zip | Telephone |
| MA | Worcester | 377 Plantation Street | 01605 | 1 (800) 394-4493 |
| | | | | |
| Dermpath Diagnostics |
| State | City | Street Address | Zip | Telephone |
| FL | Palm Beach Gardens | 7111 Fairway Drive, Suite 400 | 33418 | 1 (866) 467-7546 |
| | | | | |
| ExamOne |
| State | City | Street Address | Zip | Telephone |
| KS | Lenexa | 10101 Renner Boulevard | 66219 | 1 (913) 888-1770 |
| | | | | |
| Focus Diagnostics |
| State | City | Street Address | Zip | Telephone |
| Product manufacturing: |
| CA | Cypress | 11331 Valley View Street | 90630 | 1 (562) 240-6500 |
| Reference laboratory and Clinical Trials: |
| CA | Cypress | 5785 Corporate Avenue | 90630 | 1 (714) 220-1900 |
| | | | | |
| MedPlus |
| State | City | Street Address | Zip | Telephone |
| OH | Mason | 4690 Parkway Drive | 45040 | 1 (513) 229-5500 |
| | | | | |
| Quest Diagnostics Nichols Institute |
| State | City | Street Address | Zip | Telephone |
| CA | San Juan Capistrano | 33608 Ortega Highway | 92675 | 1 (949) 728-4000 |
| CA | Valencia | 27027 Tourney Road | 91355 | 1 (800) 421-7110 |
| VA | Chantilly | 14225 Newbrook Drive | 20151 | 1 (800) 336-3718 |
| | | | | |
| Quest Diagnostics Administration Offices |
| State | City | Street Address | Zip | Telephone |
| NJ | Madison (Headquarters) | 3 Giralda Farms | 07940 | 1 (800) 222-0446 |
| PA | Collegeville | 1201 South Collegeville Road | 19426 | 1 (610) 454-6000 |
| | | | | |
| Quest Diagnostics Clinical Trials |
| State | City | Street Address | Zip | Telephone |
| PA | Collegeville | 1201 South Collegeville Road | 19426 | 1 (800) 209-9816 |
| CA | San Juan Capistrano | 33608 Ortega Highway | 92690 | 1 (800) 209-9816 |
| CA | Northridge | 8550 Balboa, Suite 195 | 91325 | 1 (800) 209-9816 |
| | | | | |
| Quest Diagnostics Major Laboratory Facilities |
| State | City | Street Address | Zip | Telephone |
| CA | Sacramento | 3714 Northgate Boulevard | 95834 | 1 (916) 927-9900 |
| CA | San Jose | 967 Mabury Road | 95133 | 1 (408) 288-9850 |
| CA | West Hills | 8401 Fallbrook Avenue | 91304 | 1 (818) 737-6000 |
| CO | Denver | 695 South Broadway | 80209 | 1 (303) 899-6000 |
| CT | Wallingford | 3 Sterling Drive | 06492 | 1 (203) 949-5500 |
| FL | Miramar | 10200 Commerce Parkway | 33025 | 1 (954) 378-5000 |
| FL | Tampa | 4225 East Fowler Avenue | 33617 | 1 (813) 972-7100 |
| GA | Tucker | 1777 Montreal Circle | 30084 | 1 (866) 709-0772 |
| IL | Schaumburg | 506 East State Parkway | 60173 | 1 (847) 885-2010 |
| IL | Wood Dale | 1355 Mittel Boulevard. | 60191 | 1 (630) 595-3888 |
| KS | Lenexa | 10101 Renner Boulevard | 66219 | 1 (866) 697-8378 |
| KY | Lexington | 2277 Thunderstick Drive | 40505 | 1 (859) 299-3866 |
| MA | Cambridge | 415 Massachusetts Avenue | 02139 | 1 (617) 547-8900 |
| MD | Baltimore | 1901 Sulphur Spring Road | 21227 | 1 (410) 247-9100 |
| MI | Auburn Hills | 4444 Giddings Road | 48326 | 1 (248) 373-9120 |
| MO | St. Louis | 2040 Concourse Drive | 63146 | 1 (866) 697-8378 |
| NE | Lincoln | 1001 South 70th Street, Suite 111 | 68510 | 1 (866) 697-8378 |
| NJ | Teterboro | One Malcolm Avenue | 07608 | 1 (201) 393-5000 |
| NV | Las Vegas | 4230 Burnham Avenue | 89119 | 1 (702) 733-7866 |
| NY | Syosset | 575 Underhill Boulevard | 11791 | 1 (516) 677-3800 |
| OH | Cincinnati | 6700 Steger Drive | 45237 | 1 (513) 353-6000 |
| OR | Portland | 5220 NE 122nd Avenue
| 97230 | 1 (503) 306-1000 |
| PA | Horsham | 900 Business Center Drive | 19044 | 1 (215) 957-9300 |
| PA | Pittsburgh | 875 Greentree Road | 15220 | 1 (412) 920-7600 |
| PR | Bayamon | Carretera # 2 Km. 11.8 | 00960 | 1 (787) 787-8892 |
| PR | Rio Piedras | 881 Muñoz Rivera Avenue | 927 | 1 (787) 474-2900 |
| PR | San Juan | Calle Las Marias #214
Urb. Hyde Park | 927 | 1 (787) 751-7773 |
| TX | Irving | 4770 Regent Boulevard | 75063 | 1 (972) 916-3200 |
| TX | Houston | 5850 Rogerdale | 77072 | 1 (713) 877-6000 |
| WA | Seattle | 1737 Airport Way S., Suite 200 | 98134 | 1 (206) 623-8100 |