| Mobile Infirmary Medical Center | Mobile | Alabama | 36652-2144 | - |
| Arkansas Cancer Research Center at University of Arkansas for Medical Sciences | Little Rock | Arkansas | 72205 | - |
| Alta Bates Comprehensive Cancer Center | Berkeley | California | 94704 | - |
| Providence Saint Joseph Medical Center - Burbank | Burbank | California | 91505 | - |
| Peninsula Medical Center | Burlingame | California | 94010 | - |
| Eden Medical Center | Castro Valley | California | 94546 | - |
| Marin Cancer Institute at Marin General Hospital | Greenbrae | California | 94904 | - |
| Sutter Health - Western Division Cancer Research Group | Greenbrae | California | 94904 | - |
| Saint Rose Hospital | Hayward | California | 94545 | - |
| USC/Norris Comprehensive Cancer Center and Hospital | Los Angeles | California | 90089-9181 | - |
| Alta Bates Summit Medical Center - Summit Campus | Oakland | California | 94609 | - |
| CCOP - Bay Area Tumor Institute | Oakland | California | 94609 | - |
| Highland General Hospital | Oakland | California | 94602 | - |
| Desert Regional Medical Center Comprehensive Cancer Center | Palm Springs | California | 92262 | - |
| Valley Care Medical Center | Pleasanton | California | 94588 | - |
| University of California Davis Cancer Center | Sacramento | California | 95817 | - |
| California Pacific Medical Center - California Campus | San Francisco | California | 94118 | - |
| Doctors Medical Center - San Pablo Campus | San Pablo | California | 94806 | - |
| CCOP - Santa Rosa Memorial Hospital | Sana Rosa | California | 95405 | - |
| Sutter Solano Medical Center | Vallejo | California | 94589 | - |
| Poudre Valley Hospital | Fort Collins | Colorado | 80524 | - |
| Watson Clinic, LLC | Lakeland | Florida | 33804-5000 | - |
| Augusta Oncology Associates - Walton Way | Augusta | Georgia | 30901 | - |
| Curtis & Elizabeth Anderson Cancer Institute at Memorial Health University Medical Center | Savannah | Georgia | 31403-3089 | - |
| Nancy N. and J. C. Lewis Cancer and Research Pavilion at St. Joseph's/Candler | Savannah | Georgia | 31405 | - |
| St. Luke's Mountain States Tumor Institute - Boise | Boise | Idaho | 83712 | - |
| Regional Cancer Center at Memorial Medical Center | Springfield | Illinois | 62781-0001 | - |
| St. Francis Hospital and Health Centers - Beech Grove Campus | Beech Grove | Indiana | 46107 | - |
| Reid Hospital & Health Care Services, Incorporated | Richmond | Indiana | 47374 | - |
| Cancer Center of Kansas, PA - Chanute | Chanute | Kansas | 66720 | - |
| Cancer Center of Kansas, PA - Dodge City | Dodge City | Kansas | 67801 | - |
| Cancer Center of Kansas, PA - El Dorado | El Dorado | Kansas | 67042 | - |
| Kansas Masonic Cancer Research Institute at the University of Kansas Medical Center | Kansas City | Kansas | 66160-7357 | - |
| Cancer Center of Kansas, PA - Kingman | Kingman | Kansas | 67068 | - |
| Southwest Medical Center | Liberal | Kansas | 67901 | - |
| Cancer Center of Kansas, PA - Newton | Newton | Kansas | 67114 | - |
| Cancer Center of Kansas, PA - Parsons | Parsons | Kansas | 67357 | - |
| Cancer Center of Kansas, PA - Pratt | Pratt | Kansas | 67124 | - |
| Cancer Center of Kansas, PA - Salina | Salina | Kansas | 67042 | - |
| Tammy Walker Cancer Center at Salina Regional Health Center | Salina | Kansas | 67401 | - |
| Cancer Center of Kansas, PA - Wellington | Wellington | Kansas | 67152 | - |
| Associates in Womens Health, PA - North Review | Wichita | Kansas | 67203 | - |
| Cancer Center of Kansas, PA - Medical Arts Tower | Wichita | Kansas | 67208 | - |
| Cancer Center of Kansas, PA - Wichita | Wichita | Kansas | 67214 | - |
| CCOP - Wichita | Wichita | Kansas | 67214 | - |
| Via Christi Cancer Center at Via Christi Regional Medical Center | Wichita | Kansas | 67214 | - |
| Wesley Medical Center | Wichita | Kansas | 67214 | - |
| Cancer Center of Kansas, PA - Winfield | Winfield | Kansas | 67156 | - |
| Markey Cancer Center at University of Kentucky Chandler Medical Center | Lexington | Kentucky | 40536-0293 | - |
| University of Michigan Comprehensive Cancer Center | Ann Arbor | Michigan | 48109-0942 | - |
| Battle Creek Health System Cancer Care Center | Battle Creek | Michigan | 49017 | - |
| Mecosta County Medical Center | Big Rapids | Michigan | 49307 | - |
| Josephine Ford Cancer Center at Henry Ford Hospital | Detroit | Michigan | 48202 | - |
| CCOP - Grand Rapids | Grand Rapids | Michigan | 49503 | - |
| Lacks Cancer Center at Saint Mary's Health Care | Grand Rapids | Michigan | 49503 | - |
| Metro Health Hospital | Grand Rapids | Michigan | 49506 | - |
| Spectrum Health Hospital - Butterworth Campus | Grand Rapids | Michigan | 49503 | - |
| Holland Community Hospital | Holland | Michigan | 49423 | - |
| Hackley Hospital | Muskegon | Michigan | 49442 | - |
| Munson Medical Center | Traverse City | Michigan | 49684 | - |
| CCOP - Kansas City | Kansas City | Missouri | 64131 | - |
| CCOP - Cancer Research for the Ozarks | Springfield | Missouri | 65802 | - |
| Hulston Cancer Center at Cox Medical Center South | Springfield | Missouri | 65807 | - |
| St. John's Regional Health Center | Springfield | Missouri | 65804 | - |
| Saint Louis University Cancer Center | St Louis | Missouri | 63110 | - |
| Billings Clinic - Downtown | Billings | Montana | 59107-7000 | - |
| CCOP - Montana Cancer Consortium | Billings | Montana | 59101 | - |
| Hematology-Oncology Centers of the Northern Rockies - Billings | Billings | Montana | 59101 | - |
| Northern Rockies Radiation Oncology Center | Billings | Montana | 59101 | - |
| St. Vincent Healthcare Cancer Care Services | Billings | Montana | 59101 | - |
| Bozeman Deaconess Cancer Center | Bozeman | Montana | 59715 | - |
| St. James Healthcare Cancer Care | Butte | Montana | 59701 | - |
| - | Great Falls | Montana | 59405 | - |
| Great Falls Clinic - Main Facility | Great Falls | Montana | 59405 | - |
| St. Peter's Hospital | Helena | Montana | 59601 | - |
| Glacier Oncology, PLLC | Kalispell | Montana | 59901 | - |
| Kalispell Medical Oncology at KRMC | Kalispell | Montana | 59901 | - |
| Kalispell Regional Medical Center | Kalispell | Montana | 59901 | - |
| Community Medical Center | Missoula | Montana | 59801 | - |
| Guardian Oncology and Center for Wellness | Missoula | Montana | 59804 | - |
| Montana Cancer Center at St. Patrick Hospital and Health Sciences Center | Missoula | Montana | 59807 | - |
| Montana Cancer Specialists at Montana Cancer Center | Missoula | Montana | 59807-7877 | - |
| Good Samaritan Cancer Center at Good Samaritan Hospital | Kearney | Nebraska | 68848-1990 | - |
| Interlakes Oncology/Hematology PC | Rochester | New York | 14623 | - |
| James P. Wilmot Cancer Center at University of Rochester Medical Center | Rochester | New York | 14642 | - |
| Wayne Memorial Hospital, Incorporated | Goldsboro | North Carolina | 27534 | - |
| McDowell Cancer Center at Akron General Medical Center | Akron | Ohio | 44307 | - |
| CCOP - Dayton | Dayton | Ohio | 45429 | - |
| David L. Rike Cancer Center at Miami Valley Hospital | Dayton | Ohio | 45409 | - |
| Good Samaritan Hospital | Dayton | Ohio | 45406 | - |
| Grandview Hospital | Dayton | Ohio | 45405 | - |
| Samaritan North Cancer Care Center | Dayton | Ohio | 45415 | - |
| Veterans Affairs Medical Center - Dayton | Dayton | Ohio | 45428 | - |
| Blanchard Valley Medical Associates | Findlay | Ohio | 45840 | - |
| Charles F. Kettering Memorial Hospital | Kettering | Ohio | 45429 | - |
| Middletown Regional Hospital | Middletown | Ohio | 45044 | - |
| UVMC Cancer Care Center at Upper Valley Medical Center | Troy | Ohio | 45373-1300 | - |
| Ruth G. McMillan Cancer Center at Greene Memorial Hospital | Xenia | Ohio | 45385 | - |
| Legacy Mount Hood Medical Center | Gresham | Oregon | 97030 | - |
| Providence Milwaukie Hospital | Milwaukie | Oregon | 97222 | - |
| CCOP - Columbia River Oncology Program | Portland | Oregon | 97225 | - |
| Legacy Emanuel Hospital and Health Center & Children's Hospital | Portland | Oregon | 97227 | - |
| Legacy Good Samaritan Hospital & Medical Center Comprehensive Cancer Center | Portland | Oregon | 97210 | - |
| Northwest Cancer Specialists at Rose Quarter Cancer Center | Portland | Oregon | 97227 | - |
| Oregon Health & Science University Cancer Institute | Portland | Oregon | 97239-3098 | - |
| Providence Cancer Center at Providence Portland Medical Center | Portland | Oregon | 97213-2967 | - |
| Providence St. Vincent Medical Center | Portland | Oregon | 97225 | - |
| Salem Hospital Regional Cancer Care Services | Salem | Oregon | 97309-5014 | - |
| Legacy Meridian Park Hospital | Tualatin | Oregon | 97062 | - |
| Hollings Cancer Center at Medical University of South Carolina | Charleston | South Carolina | 29425 | - |
| Roper St. Francis Cancer Center at Roper Hospital | Charleston | South Carolina | 29401 | - |
| CCOP - Greenville | Greenville | South Carolina | 29615 | - |
| Christine LaGuardia Phillips Cancer Center at Wellmont Holston Valley Medical Center | Kingsport | Tennessee | 37662 | - |
| U.T. Cancer Institute at University of Tennessee Medical Center | Knoxville | Tennessee | 37920-6999 | - |
| Danville Regional Medical Center | Danville | Virginia | 24541 | - |
| Southwest Virginia Regional Cancer Center | Norton | Virginia | 24273 | - |
| St. Joseph Cancer Center | Bellingham | Washington | 98225 | - |
| Olympic Hematology and Oncology | Bremerton | Washington | 98310 | - |
| Columbia Basin Hematology | Kennewick | Washington | 99336 | - |
| Skagit Valley Hospital Cancer Care Center | Mount Vernon | Washington | 98273 | - |
| Fred Hutchinson Cancer Research Center | Seattle | Washington | 98104 | - |
| Group Health Central Hospital | Seattle | Washington | 98112 | - |
| Harborview Medical Center | Seattle | Washington | 98104 | - |
| Minor and James Medical, PLLC | Seattle | Washington | 98104 | - |
| Polyclinic First Hill | Seattle | Washington | 98122 | - |
| Swedish Cancer Institute at Swedish Medical Center - First Hill Campus | Seattle | Washington | 98122-4307 | - |
| University Cancer Center at University of Washington Medical Center | Seattle | Washington | 98195-6043 | - |
| Cancer Care Northwest - Spokane South | Spokane | Washington | 99202 | - |
| Northwest Cancer Specialists at Vancouver Cancer Center | Vancouver | Washington | 98684 | - |
| Southwest Washington Medical Center Cancer Center | Vancouver | Washington | 98668 | - |
| Wenatchee Valley Medical Center | Wenatchee | Washington | 98801-2028 | - |
| Welch Cancer Center at Sheridan Memorial Hospital | Sheridan | Wyoming | 82801 | - |