| argentina | tierra del fuego province | lontra canadensis | species | 0 | 2 |
| argentina | tierra del fuego province | lontra provocax | species | 0 | 2 |
| austria | burgenland | lutra lutra | species | 1 | 0 |
| bangladesh | | lutrogale perspicillata | species | 1 | 0 |
| belarus | | lutra lutra | species | 1 | 0 |
| brazil | amazonas | lontra longicaudis | species | 0 | 1 |
| brazil | amazonas | pteronura brasiliensis | species | 0 | 2 |
| cambodia | | lutrogale perspicillata | species | 3 | 0 |
| canada | | lontra canadensis | species | 1 | 0 |
| canada | british columbia | enhydra lutris | species | 0 | 5 |
| canada | british columbia | lontra canadensis | species | 1 | 3 |
| canada | nova scotia | lontra canadensis | species | 0 | 5 |
| canada | ontario | lontra canadensis | species | 1 | 7 |
| china | | lutra lutra | species | 2 | 0 |
| china | | lutrogale perspicillata | species | 1 | 0 |
| costa rica | | lontra longicaudis | species | 1 | 0 |
| finland | central finland region | lutra lutra | species | 0 | 1 |
| france | pays de la loire region | lutra lutra | species | 0 | 1 |
| french guiana | | lontra longicaudis | species | 4 | 0 |
| germany | | lutra lutra | species | 6 | 0 |
| germany | saxony | lutra lutra | species | 0 | 2 |
| guam | | enhydra lutris | species | 0 | 1 |
| india | | lutra lutra | species | 1 | 0 |
| india | | lutrogale perspicillata | species | 4 | 0 |
| indonesia | | lutrogale perspicillata | species | 1 | 0 |
| indonesia | jambi province | aonyx cinerea | species | 1 | 0 |
| iraq | | lutra lutra | species | 3 | 0 |
| iraq | | lutrogale perspicillata | species | 1 | 0 |
| iraq | kirkuk governorate | lutrogale perspicillata | species | 1 | 0 |
| iraq | maysan governorate | lutrogale perspicillata | species | 1 | 0 |
| ireland | | lutra lutra | species | 2 | 0 |
| israel | southern district | lutra lutra | species | 0 | 1 |
| italy | | lutra lutra | species | 1 | 0 |
| italy | abruzzo region | lutra lutra | species | 42 | 0 |
| italy | emilia-romagna region | lutra lutra | species | 8 | 0 |
| italy | lazio region | lutra lutra | species | 11 | 0 |
| italy | tuscany region | lutra lutra | species | 36 | 0 |
| italy | veneto region | lutra lutra | species | 2 | 0 |
| japan | kanagawa prefecture | lutra lutra | species | 1 | 1 |
| japan | kochi prefecture | lutra lutra | species | 1 | 1 |
| laos | | aonyx cinerea | species | 1 | 0 |
| laos | | lutra lutra | species | 3 | 0 |
| luxembourg | | lutra lutra | species | 0 | 1 |
| malaysia | | lutrogale perspicillata | species | 4 | 0 |
| malaysia | johor | aonyx cinerea | species | 0 | 1 |
| malaysia | johor | lutra sumatrana | species | 0 | 1 |
| malaysia | johor | lutrogale perspicillata | species | 0 | 1 |
| malaysia | kelantan | aonyx cinerea | species | 0 | 1 |
| malaysia | kelantan | lutra sumatrana | species | 0 | 1 |
| malaysia | kelantan | lutrogale perspicillata | species | 0 | 1 |
| malaysia | perak | aonyx cinerea | species | 0 | 1 |
| malaysia | perak | lutra sumatrana | species | 0 | 1 |
| malaysia | perak | lutrogale perspicillata | species | 0 | 1 |
| malaysia | terengganu | aonyx cinerea | species | 0 | 1 |
| malaysia | terengganu | lutra sumatrana | species | 0 | 1 |
| malaysia | terengganu | lutrogale perspicillata | species | 0 | 1 |
| mexico | | lontra longicaudis | species | 23 | 0 |
| mexico | baja california | enhydra lutris nereis | subspecies | 1 | 0 |
| micronesia | | enhydra lutris | species | 0 | 1 |
| myanmar | | lutra lutra | species | 2 | 0 |
| pakistan | sindh province | lutra sumatrana | species | 0 | 1 |
| peru | madre de dios region | pteronura brasiliensis | species | 0 | 1 |
| poland | | lutra lutra | species | 2 | 0 |
| poland | lower silesia province | lutra lutra | species | 0 | 1 |
| poland | silesia province | lutra lutra | species | 0 | 1 |
| portugal | castelo branco district | lutra lutra | species | 0 | 1 |
| russia | | lutra lutra | species | 4 | 0 |
| russia | kamchatka krai | enhydra lutris | species | 0 | 2 |
| singapore | | aonyx cinerea | species | 3 | 0 |
| south korea | | lutra lutra | species | 7 | 0 |
| spain | | lutra lutra | species | 1 | 0 |
| spain | andalusia | lutra lutra | species | 0 | 2 |
| spain | asturias | lutra lutra | species | 1 | 1 |
| spain | basque country | lutra lutra | species | 0 | 1 |
| spain | catalonia | lutra lutra | species | 0 | 1 |
| spain | extremadura | lutra lutra | species | 0 | 2 |
| spain | madrid | lutra lutra | species | 0 | 1 |
| taiwan | | lutra lutra | species | 6 | 0 |
| thailand | | aonyx cinerea | species | 2 | 0 |
| thailand | | lutrogale perspicillata | species | 1 | 0 |
| thailand | ranong province | aonyx cinerea | species | 0 | 1 |
| thailand | ranong province | lutra sumatrana | species | 0 | 1 |
| thailand | ranong province | lutrogale perspicillata | species | 0 | 1 |
| united kingdom | | lutra lutra | species | 5 | 0 |
| united kingdom | england | lutra lutra | species | 0 | 20 |
| united kingdom | scotland | lutra lutra | species | 0 | 4 |
| united kingdom | wales | lutra lutra | species | 40 | 7 |
| united states | | enhydra lutris | species | 1 | 0 |
| united states | | enhydra lutris nereis | subspecies | 1 | 0 |
| united states | | lutra environmental sample | species | 3 | 0 |
| united states | alaska | enhydra lutris | species | 5 | 33 |
| united states | alaska | enhydra lutris kenyoni | subspecies | 0 | 8 |
| united states | alaska | enhydra lutris nereis | subspecies | 0 | 5 |
| united states | alaska | lontra canadensis | species | 0 | 8 |
| united states | california | enhydra lutris | species | 0 | 63 |
| united states | california | enhydra lutris kenyoni | subspecies | 0 | 3 |
| united states | california | enhydra lutris nereis | subspecies | 1 | 29 |
| united states | california | lontra canadensis | species | 1 | 1 |
| united states | california | lontra longicaudis | species | 0 | 1 |
| united states | florida | enhydra lutris | species | 0 | 2 |
| united states | florida | lontra canadensis | species | 1 | 1 |
| united states | florida | lontra longicaudis | species | 0 | 1 |
| united states | georgia | lontra canadensis | species | 0 | 2 |
| united states | illinois | lontra canadensis | species | 0 | 2 |
| united states | louisiana | lontra canadensis | species | 0 | 3 |
| united states | massachusetts | enhydra lutris | species | 0 | 1 |
| united states | mississippi | lontra canadensis | species | 0 | 1 |
| united states | new jersey | lontra canadensis | species | 0 | 1 |
| united states | new mexico | lontra canadensis | species | 0 | 1 |
| united states | new york | lontra canadensis | species | 10 | 4 |
| united states | north carolina | lontra canadensis | species | 0 | 4 |
| united states | ohio | lontra canadensis | species | 0 | 2 |
| united states | oklahoma | lontra canadensis | species | 0 | 3 |
| united states | oregon | lontra canadensis | species | 0 | 6 |
| united states | pennsylvania | lontra canadensis | species | 0 | 1 |
| united states | south carolina | lontra canadensis | species | 1 | 0 |
| united states | tennessee | lontra canadensis | species | 0 | 1 |
| united states | virginia | lontra canadensis | species | 0 | 1 |
| united states | washington | enhydra lutris | species | 0 | 9 |
| united states | washington | enhydra lutris kenyoni | subspecies | 0 | 1 |
| united states | washington | enhydra lutris nereis | subspecies | 0 | 1 |
| united states | washington | lontra canadensis | species | 0 | 7 |
| united states | wisconsin | enhydra lutris | species | 0 | 1 |
| united states | wisconsin | lontra canadensis | species | 0 | 3 |
| united states | wyoming | lontra canadensis | species | 0 | 1 |
| vietnam | | lutrogale perspicillata | species | 1 | 0 |