| algeria | | strix aluco mauritanica | subspecies | 2 | 0 |
| argentina | rio negro province | strix rufipes | species | 1 | 0 |
| austria | | strix aluco aluco | subspecies | 40 | 0 |
| austria | | strix uralensis | species | 1 | 0 |
| austria | | strix uralensis macroura | subspecies | 1 | 0 |
| austria | styria | strix aluco | species | 1 | 0 |
| brazil | minas gerais | strix hylophila | species | 1 | 0 |
| cameroon | | strix woodfordii | species | 1 | 0 |
| canada | alberta | strix occidentalis | species | 0 | 1 |
| canada | alberta | strix occidentalis caurina | subspecies | 0 | 1 |
| canada | alberta | strix varia | species | 10 | 0 |
| canada | british columbia | strix varia | species | 0 | 1 |
| canada | nova scotia | strix varia | species | 3 | 0 |
| canada | ontario | strix nebulosa | species | 1 | 0 |
| canada | ontario | strix varia | species | 2 | 0 |
| canada | quebec | strix nebulosa | species | 1 | 0 |
| canada | quebec | strix varia | species | 1 | 1 |
| canada | yukon | strix nebulosa | species | 1 | 0 |
| canada | yukon | strix varia | species | 0 | 1 |
| china | | strix davidi | species | 1 | 0 |
| china | | strix uralensis | species | 3 | 0 |
| czech republic | | strix uralensis | species | 1 | 0 |
| denmark | | strix aluco aluco | subspecies | 30 | 0 |
| finland | | strix aluco aluco | subspecies | 12 | 0 |
| finland | | strix uralensis | species | 2 | 0 |
| finland | | strix uralensis liturata | subspecies | 3 | 0 |
| france | | strix aluco sylvatica | subspecies | 58 | 0 |
| germany | | strix aluco sylvatica | subspecies | 1 | 0 |
| germany | | strix uralensis | species | 1 | 0 |
| germany | berlin | strix aluco | species | 0 | 3 |
| germany | berlin | strix nebulosa | species | 0 | 1 |
| germany | brandenburg | strix aluco | species | 0 | 3 |
| gibraltar | | strix aluco | species | 0 | 1 |
| greece | | strix aluco aluco | subspecies | 24 | 0 |
| hungary | | strix uralensis | species | 1 | 0 |
| iran | razavi khorasan province | strix omanensis | species | 1 | 0 |
| israel | | strix aluco wilkonskii | subspecies | 1 | 0 |
| israel | | strix butleri | species | 2 | 0 |
| italy | | strix aluco aluco | subspecies | 43 | 0 |
| italy | aosta valley autonomous region | strix aluco | species | 1 | 0 |
| italy | calabria region | strix aluco | species | 0 | 1 |
| italy | piemonte region | strix aluco | species | 2 | 0 |
| japan | chiba prefecture | strix uralensis | species | 2 | 0 |
| japan | fukushima prefecture | strix uralensis | species | 1 | 0 |
| japan | hokkaido prefecture | strix uralensis | species | 8 | 0 |
| japan | hokkaido prefecture | strix uralensis japonica | subspecies | 1 | 0 |
| japan | hyogo prefecture | strix uralensis | species | 0 | 1 |
| japan | kanagawa prefecture | strix leptogrammica | species | 1 | 0 |
| morocco | | strix aluco mauritanica | subspecies | 1 | 0 |
| nepal | | strix aluco nivicola | subspecies | 2 | 0 |
| norway | | strix aluco aluco | subspecies | 10 | 0 |
| norway | | strix uralensis | species | 1 | 0 |
| norway | akershus county | strix aluco | species | 1 | 0 |
| norway | finnmark county | strix nebulosa | species | 2 | 0 |
| norway | more og romsdal county | strix aluco | species | 0 | 2 |
| norway | oslo county | strix uralensis | species | 0 | 1 |
| norway | telemark county | strix aluco | species | 1 | 0 |
| portugal | | strix aluco sylvatica | subspecies | 26 | 0 |
| portugal | guarda | strix aluco | species | 1 | 0 |
| russia | irkutsk oblast | strix uralensis | species | 1 | 0 |
| russia | khabarovsk krai | strix uralensis | species | 1 | 0 |
| singapore | | strix aluco | species | 0 | 1 |
| slovakia | | strix uralensis | species | 1 | 0 |
| slovenia | | strix uralensis | species | 2 | 0 |
| south africa | | strix woodfordii woodfordii | subspecies | 1 | 0 |
| south korea | | strix aluco | species | 11 | 0 |
| south korea | | strix uralensis | species | 1 | 0 |
| spain | | strix aluco | species | 20 | 0 |
| spain | | strix aluco sylvatica | subspecies | 36 | 0 |
| spain | basque country | strix aluco | species | 0 | 1 |
| spain | catalonia | strix aluco | species | 0 | 1 |
| spain | galicia | strix aluco | species | 0 | 6 |
| spain | madrid | strix aluco | species | 0 | 1 |
| sweden | | strix uralensis | species | 3 | 0 |
| sweden | dalarna | strix aluco | species | 1 | 0 |
| sweden | gavleborg | strix uralensis | species | 1 | 0 |
| sweden | norrbotten | strix nebulosa | species | 1 | 0 |
| sweden | stockholm | strix aluco | species | 2 | 0 |
| sweden | vasternorrland | strix nebulosa | species | 1 | 0 |
| switzerland | | strix aluco | species | 14 | 0 |
| taiwan | | strix aluco yamadae | subspecies | 2 | 0 |
| united kingdom | | strix aluco sylvatica | subspecies | 18 | 0 |
| united kingdom | england | strix aluco | species | 0 | 3 |
| united kingdom | scotland | strix aluco | species | 0 | 1 |
| united states | alabama | strix varia | species | 0 | 2 |
| united states | california | strix nebulosa | species | 0 | 1 |
| united states | california | strix occidentalis | species | 0 | 9 |
| united states | california | strix occidentalis caurina | subspecies | 3 | 4 |
| united states | california | strix occidentalis occidentalis | subspecies | 0 | 6 |
| united states | california | strix varia | species | 0 | 2 |
| united states | florida | strix varia | species | 9 | 2 |
| united states | georgia | strix varia | species | 7 | 2 |
| united states | idaho | strix nebulosa | species | 0 | 1 |
| united states | kansas | strix varia | species | 6 | 0 |
| united states | louisiana | strix varia | species | 4 | 1 |
| united states | maine | strix varia | species | 7 | 0 |
| united states | maryland | strix varia | species | 1 | 0 |
| united states | michigan | strix varia | species | 5 | 0 |
| united states | minnesota | strix nebulosa | species | 2 | 0 |
| united states | minnesota | strix varia | species | 5 | 0 |
| united states | mississippi | strix varia | species | 3 | 3 |
| united states | nebraska | strix varia | species | 5 | 0 |
| united states | nevada | strix nebulosa | species | 0 | 1 |
| united states | nevada | strix occidentalis | species | 0 | 4 |
| united states | nevada | strix occidentalis occidentalis | subspecies | 0 | 3 |
| united states | new jersey | strix varia | species | 5 | 0 |
| united states | new mexico | strix occidentalis | species | 1 | 0 |
| united states | new york | strix varia | species | 1 | 0 |
| united states | north carolina | strix varia | species | 10 | 0 |
| united states | ohio | strix varia | species | 6 | 0 |
| united states | ohio | strix varia varia | subspecies | 1 | 0 |
| united states | oregon | strix occidentalis | species | 3 | 3 |
| united states | oregon | strix occidentalis caurina | subspecies | 0 | 3 |
| united states | oregon | strix varia | species | 6 | 1 |
| united states | tennessee | strix varia | species | 4 | 0 |
| united states | texas | strix occidentalis | species | 0 | 1 |
| united states | texas | strix occidentalis caurina | subspecies | 0 | 1 |
| united states | texas | strix varia | species | 5 | 0 |
| united states | washington | strix occidentalis | species | 3 | 1 |
| united states | washington | strix occidentalis caurina | subspecies | 0 | 1 |
| united states | washington | strix varia | species | 5 | 0 |