Decided to do a quick skim of recent references for more Burrowing Owl holders - then did Snowy, Spectacled and screech owls too because why not. I limited what I found largely to AZA or at least traditional zoos, though I also found some raptor and nature centers for these species as well. These should all be on-display animals.
ADD for Burrowing Owl:
Abilene
Caldwell
El Paso
Fort Worth
Maritime Aquarium (CT)
Orange County
Riverbanks
REMOVE
Smithsonian National (previously located in the Bird House, not reported since its 2023 reopening)
ADD for Spectacled Owl:
Gulf Breeze Zoo (FL)
Salisbury
Santa Ana
ADD for Snowy Owl:
Akron
Northwest Trek
Oregon Zoo
VINS (Vermont Institute of Natural Science) (a more obscure facility, but given that Snowy Owls are both well-known and not that common in nature centers I thought I'd mention this one. They have other owls too)
REMOVE
Louisville (appears to have been replaced with Red Panda in 2023)
Brookfield (no recent references, absent from 2022 lists)
ADD for Eastern Screech Owl:
Audubon Aquarium (LA)
Brevard
Busch Gardens Tampa
Dickerson Park
Gladys Porter
Lake Superior (confirmed 2023, ? can be removed)
Lehigh Valley
Lincoln Park
Potawatomi
Sunset Zoo (KS)
ADD for Western Screech Owl:
Oregon Zoo
Wildlife Images (OR) (again, a more obscure facility - mentioned as Western is not a widely held species)
And an incidental holding I came across: Barn Owl at Akron Zoo.