United States

• Graybloom Farm Sanctuary - Flat Rock, AL. Tours unavailable, but regular volunteer hours every week.
  Promotes veganism. 

• Full Belly Farm Animal Sanctuary - Lexington, AL (adjacent to the Tennessee border). Availability of tours/visitation unclear, but open for volunteering.
  Promotes veganism.

• Dominion Farm Sanctuary - Fairhope, AL. Availability of tours/visitation unclear, but open for volunteering.
  Promotes veganism, primarily from a religious (Christian) perspective.

• Longleaf Animal Sanctuary in Spanish Fort, AL is very new and so I don't have much information about it nor do I feel it fit to properly include. Watch their website & social media for updates.

• Forget Me Not Farm Sanctuary - Eagle River, AK. Open to the public (tours & volunteering).
  Promotes veganism.

• Aimee's Farm Animal Sanctuary - San Tan Valley, AZ. Open to the public (tours & volunteering).
  Promotes veganism.

• Animal Guardian Network at Healing River Ranch - Camp Verde, AZ. Open to the public (tours & volunteering).
  It is not fully clear if the sanctuary is vegan, but multiple Facebook posts involve explicitily vegan food & some posts includes the text "#vegan".

Pima County

• Sunny Haven Farm Animal Sanctuary - Tucson, AZ. Open to the public (tours).
  Promotes veganism.

• Ironwood Pig Sanctuary - Marana, AZ (outskirts of Tucson). Open to the public (tours & volunteering).
  It is unclear if the sanctuary promotes veganism.

Maricopa County

• Farm Angels Sanctuary - Surprise, AZ. Tours only available to sponsers, open for volunteering.
  Promotes veganism.

• Goats With Horns Animal Sanctuary - Gilbert, AZ. Open to the public (tours & volunteering).
  Promotes veganism.

• Freed Spirits Animal Rescue - Phoenix, AZ. Open to the public (tours & volunteering).
  It is unclear if the sanctuary promotes veganism.

• Better Piggies Rescue - Phoenix, AZ. Open to the public (tours & volunteering).
  Promotes veganism.

• Sunset Farms Sanctuary - Cove, AR. Visitation available via Email, availability of volunteering unclear.
  Promotes veganism.

Northern California

• Animal Place - Grass Valley, CA. Open to the public (tours & volunteering), GFAS Accredited.
  Promotes veganism.

• Love Creek Sanctuary - Grass Valley, CA. Open to the public (camping & volunteering).
  It is unclear if the sanctuary promotes veganism.

• Blackberry Creek Farm Animal Sanctuary - Colfax, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Harvest Home Animal Sanctuary - Stockton, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Rancho Compasión - Marin County, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Alma Bonita Animal Rescue - Morgan Hill, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Goshala BJ Animal Care - Morgan Hill, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Only Sunshine Sanctuary - Elverta, CA (14 miles from Sacramento). Availability of tours/visitation unclear, but appears to be open for volunteering.
  Promotes veganism.

• Rory Pond Rescue Ranch - Wilton, CA. Open to the public (tours & volunteering).
  Promotes veganism

• HartSong Ranch Animal Sanctuary - Greenwood, El Dorado County, CA. Open to the public (tours, camping, & volunteering).
  Promotes veganism.

Solona County

• PreetiRang Sanctuary - Dixon, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Herd & Flock Animal Sanctuary - Vacaville, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Zinger Ranch Farm Sanctuary - Vacaville, CA. Availability of tours/visitaion unclear, but open for volunteering.
  It is unclear if the sanctuary promotes veganism.

• Funky Chicken Rescue - Vacaville, CA. Availability of tours/visitaion unclear, but open for volunteering.
  It is unclear if the sanctuary promotes veganism.

Sonoma County

• Charlie's Acres Farm Animal Sanctuary - Sonoma, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Goatlandia Farm Animal Sanctuary - Sebastopol, CA (15mins west of Santa Rosa). Open to the public (tours & volunteering).
  Promotes veganism.

• Loving Farm Animal Sanctuary - Santa Rosa, CA. Open to the public (tours & volunteering).
  Promotes veganism.

Contra Costa County

• Genevieve's Gentle Hearts Rescue - Alamo, CA (28 miles from San Francisco [SF]). Availability of visitation unclear, but may be open for volunteering if contacted.
  Promotes veganism.

• One Living Sanctuary - Martinez, CA (31 miles from SF). Open to the public (tours & volunteering).
  Promotes veganism.

• Kim's Nurturing Nest Animal Sanctuary - Danville, CA (31 miles from SF). Open to the public (tours & volunteering).
  Promotes veganism.

Central Coast of California

• Martha's Farm Animal Sanctuary - Buellton, CA. Open to the public (tours & volunteering).
  Promotes veganism.

San Luis Obsipo County

• Happy Hen Animal Sanctuary - San Luis Obsipo, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Green Pastures Farm Sanctuary - Arroyo Grande, CA. Availability of tours/visitation unclear, but appears to be open for volunteering.
  Promotes veganism.

Santa Cruz County

• Little Hill Sanctuary - Watsonville, CA. Availability of tours/visitation unclear, but appears to be open for volunteering.
  Promotes veganism.

• Hen Harbor - Felton, CA. Availability of visitation, tours, or volunteering unclear. I'd recommending contacting for additional info.
  Promotes veganism.

Southern California

• Grateful Heart Animal Sanctuary - Big Bear City, CA. Availability of tours/visitaion unclear, but open for volunteering.
  It is unclear if the sanctuary promotes veganism.

San Diego County

• Farm Animal Refuge - Campo, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Saving Hearts & Healing Animals Inc. - Ramona, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• 2 The Rescue Animal Sanctuary - Ramona, CA. Open to the public (tours, camping, & volunteering).
  It is unclear if the sanctuary promotes veganism.

• Steampunk Farm Rescue Barn - Ranchita, CA. Availability of visitation unclear, but may be open for volunteering if contacted.
  Promotes veganism.

Riverside County

• Sale Ranch Animal Sanctuary - Temecula, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Viva Rescue - Menifee, CA. Open to the public (Events, private tours, & volunteering).
  Promotes veganism.

• New Life Animal Sanctuary - Lake Elsinore, CA. Open to the public (volunteering & "visits" via Email).
  It is unclear if the sanctuary promotes veganism.

Los Angeles County

• Kindred Spirits Care Farm - Chatsworth, Los Angeles, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Love Always Sanctuary - Sun Valley, Los Angeles, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Singer Sanctuary - Shadow Hills, Los Angeles, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Buster's Barn - Palmdale, CA. Availability of volunteering unclear, but open for scheduled visits.
  Promotes veganism.

• Farm Sanctuary - Acton, CA. Open to the public (tours & volunteering), GFAS Accredited.
  Promotes veganism.

• Saving Grace Animal Sanctuary - Acton, CA (7 minute drive from Farm Sanctuary). Open to the public (tours & volunteering).
  Promotes veganism.

• The Gentle Barn - Santa Clarita, CA. Open to the public (tours & volunteering).
  Promotes veganism.

• Luvin Arms Animal Sanctuary - Erie, CO. Open to the public (tours & volunteering), GFAS Accredited.
  Promotes veganism.

• Project: THRIVE - Hudson, CO. Open to the public (events for young/school children & volunteering).
  Promotes veganism.

• Good Life Refuge - Longmont, CO. Open to the public (tours & volunteering).
  Promotes veganism.

• Tails of Two Cities Sanctuary - Nederland, CO. Availability of tours/visitation unclear, but open for volunteering.
  It is unclear if the sanctuary promotes veganism.

• Rescued Friends Animal Sanctuary - Fort Collins, CO. Open to the public (tours & volunteering).
  Promotes veganism.

• Mountain View Sanctuary - Walsenburg, CO. Availability of visitation unclear, but may be open for volunteering if contacted.
  Promotes veganism.

• Mountain View Sanctuary - Walsenburg, CO. Availability of visitation unclear, but may be open for volunteering if contacted.
  Promotes veganism.

• Apple Valley Farm Sanctuary - Penrose, CO. Not open for any tours or volunteers currently.
  Promotes veganism.

Adams & Arapahoe County

• Hog Haven Farm - Deer Trail, CO. Open for occasional events & seasonal volunteering.
  Promotes veganism.

• Peaceful Praire Sanctuary - Deer Trail, CO. Open to the public (tours & volunteering, via Email).
  Promotes veganism.

• Rooster Sanctuary at Danzig's Roost - Benett, CO. Requests for tours available via Email, but no publicly available information on volunteering.
  Promotes veganism.

• Broken Shovels Farm Sanctuary - Henderson, CO. Open to the public (tours & volunteering).
  Promotes veganism.

• Freedom Farm Animal Sanctuary - Middlebury, CT. Open to the public (tours & volunteering).
  Promotes veganism. 

• JP Farm Animal Sanctuary - Litchfield, CT. Open to the public (tours & volunteering, via contact form)
  Promotes veganism. 

• Road to Refuge Animal Sanctuary - North Haven, CT. Open to the public (tours & volunteering).
  Promotes veganism. 

• Locket's Meadow Farm - Bethany, CT. Open to the public (tours & volunteering).
  Promotes veganism. 

• The Riley Farm Rescue - Canterbury, CT. Open to the public (tours & volunteering).
  Promotes veganism. 

• Anam Cara Sanctuary Farm in East Haddam is open to the public (scheduled visits via Email & volunteering) but does not meet the inclusion criteria for this website, since they ocassioanlly consume their chickens' eggs & feed their pets animal-based food. I don't care *too much* about the former, although it is technically exploitation, but I definitely care about the latter. Nontheless, you can read this reel where they explain their perspective in the caption, and decide for yourself.

In Delaware itself, we could not locate any vegan farm animal sanctuaries. But here are the closest ones:

Rose Bridge Farm & Sanctuary

Skylands Animal Sanctuary & Rescue

Freedom Farm Animal Rescue - only facebook, visits every saturday

Whispering Rise Farm & Animal Sanctuary

• CJ Acres Animal Rescue Farm - Keystone Heights, FL. Open to the public (tours & volunteering).
  Promotes veganism. 

• Kindred Spirits Sanctuary - Citra, FL. Open to the public (tours & volunteering).
  Promotes veganism. 

• Critter Creek Farm Sanctuary - Gainesville, FL. Open to the public (tours & volunteering).
  Promotes veganism. 

• Little Bear Sanctuary - Punta Gorda, FL. Open to the public (tours & volunteering).
  Promotes veganism. 

• Rooterville Animal Sanctuary - Melrose, FL. Open to the public (tours & volunteering).
  Promotes veganism. 

• Yesahcan Sanctuary - Lake City, FL. Open to the public (tours & volunteering), GFAS Accredited.
  Promotes veganism. 

• Florida Rescue Farm - Duette, FL. Open to the public (tours & volunteering).
  Promotes veganism. 

• Peacefield Farm Sanctuary - Newberry, FL. Open to the public (events & volunteering).
  Promotes veganism. 

• Love Life Animal Rescue & Sanctuary - Myakka City, FL. Open to the public (events & volunteering).
  Promotes veganism. 

• ​​Noah's Ark Potbellied Pig Sanctuary - New Port Richey, FL. Open to the public (Visits via Email & volunteering).
  It is not fully clear if the sanctuary is vegan, but multiple Facebook posts include the text "#vegan".

• Aguacate Sanctuary & Rescue - Miami, FL. Open to the public (tours & volunteering).
  Promotes veganism. 

• Cudabears Lair Animal Sanctuary - Sebring, FL. Closed to the public, but available for "education and events" and volunteering.
  It is unclear if the sanctuary promotes vegan. 

• BB’s Animal Rescue & Nature Sanctuary (B.A.R.N.S.) - Bushnell, FL. Closed to the public, but available for "education and events" and volunteering.
  It is unclear if the sanctuary is vegan, but posts about attending vegan festivals and some of the language used on their website indicates they likely are. 

• useless animal farm sanctuary

• delmar farm

• Ark Rescue in Live Oak 

• Fandango Sanctuary

• Ladybug Farm Sanctuary

• Sanctuary at Soledad

• Lemondrop Farm Sanctuary & Community Outreach

• Full Circle Farm Sanctuary - Warm Springs, GA. Open to the public (tours & volunteering), GFAS Accredited.
  Promotes veganism.

• Freedom Acres Rescue - Oxford, GA. Open for visitation, availability of volunteering unclear.
  Promotes veganism.

• Farm of the Free Animal Sanctuary - Good Hope, GA. Open to the public (tours & volunteering), GFAS Accredited.
  Promotes veganism.

• Outsiders Farm & Sanctuary - Bowersville, GA. Open to the public (tours & volunteering)
  Promotes veganism.

• Flying Pigs Animal Sanctuary - Cairo, GA. Open to the public (events & volunteering, availability of tours unclear).
  Promotes veganism.

• Sweet Olive Farm - Winterville, GA. Open to the public (tours & volunteering)
  Promotes veganism.

haven't gotten around to properly formatting/check info and veganity:

five freedom farm (has dogs and cats too, promotion of veganism unclear, one of founders is veg the other is vegan, but they rarely speak about it).

Everymay farm

• Leilani Farm Sanctuary - Haʻikū, Maui, HI. Open to the public (tours & volunteering).
  Promotes veganism.

• Magical Creatures Sanctuary - Laupahoehoe, Hawaiʻi Island, HI. Open to the public (tours & volunteering), GFAS Accredited.
  Promotes veganism.

• Aloha Animal Sanctuary - Kāneʻohe, Oʻahu, HI. Open to the public (tours & volunteering).
  Promotes veganism.

• Kaua'i Animal Education Farm - Kapaʻa, Kauaʻi, HI. Open to the public (tours & volunteering).
  It is unclear if the sanctuary promotes veganism.

• FPG Plant & Animal Sanctuary - Mountain View, Hawaiʻi Island, HI. Open to the public (tours & volunteering).
  Promotes veganism.

• Idaho Farm Animal Sanctuary - Boise, ID. Closed to the public; no visitation or volunteering.
  Promotes veganism.

• Lina Lou's Farm Sanctuary - Meridian, ID.  Availability of tours/visitation unclear, but open for volunteering.
  It is unclear if the sanctuary promotes veganism.

• Dominifarm Animal Sanctuary - Kuna, ID. County restrictions do not currently allow for visitors, but the sanctuary is open for volunteering.
  It is unclear if the sanctuary promotes veganism.

• Wedrose Acres Animal Sanctuary - Gridley, IL. Open to the public (tours & volunteering).
  Promotes veganism.

• Kamins Farm Sanctuary - Gridley, IL. Open to the public (scheduled events & volunteering).
  Promotes veganism.

•