| austria | | heligmosomoides polygyrus polygyrus | subspecies | 1 | 0 |
| belgium | walloon region | heligmosomoides polygyrus | species | 15 | 0 |
| canada | | heligmosomoides polygyrus | species | 3 | 0 |
| china | sichuan | heligmosomoides polygyrus | species | 0 | 1 |
| czech republic | | heligmosomoides polygyrus polygyrus | subspecies | 2 | 0 |
| denmark | region of southern denmark | heligmosomoides polygyrus polygyrus | subspecies | 13 | 0 |
| france | | heligmosomoides polygyrus polygyrus | subspecies | 1 | 0 |
| france | centre region | heligmosomoides polygyrus | species | 7 | 0 |
| france | corse region | heligmosomoides polygyrus | species | 6 | 0 |
| france | corse region | heligmosomoides polygyrus corsicum | subspecies | 10 | 0 |
| france | ile-de-france region | heligmosomoides polygyrus | species | 0 | 1 |
| france | languedoc-roussillon region | heligmosomoides polygyrus | species | 8 | 0 |
| greece | | heligmosomoides polygyrus polygyrus | subspecies | 3 | 0 |
| greece | crete region | heligmosomoides polygyrus | species | 16 | 0 |
| greece | crete region | heligmosomoides polygyrus polygyrus | subspecies | 2 | 0 |
| greece | peloponnese region | heligmosomoides polygyrus | species | 3 | 0 |
| greece | thessaly region | heligmosomoides polygyrus polygyrus | subspecies | 2 | 0 |
| guernsey | | heligmosomoides polygyrus | species | 0 | 1 |
| ireland | leinster province | heligmosomoides polygyrus polygyrus | subspecies | 2137 | 0 |
| ireland | northern ireland | heligmosomoides polygyrus polygyrus | subspecies | 82 | 0 |
| italy | | heligmosomoides polygyrus polygyrus | subspecies | 5 | 0 |
| italy | calabria region | heligmosomoides polygyrus | species | 6 | 0 |
| italy | calabria region | heligmosomoides polygyrus polygyrus | subspecies | 2 | 0 |
| italy | liguria region | heligmosomoides polygyrus | species | 13 | 0 |
| italy | liguria region | heligmosomoides polygyrus polygyrus | subspecies | 17 | 0 |
| italy | sardinia autonomous region | heligmosomoides polygyrus | species | 1 | 0 |
| italy | sicily autonomous region | heligmosomoides polygyrus | species | 9 | 0 |
| italy | tuscany region | heligmosomoides polygyrus | species | 14 | 0 |
| luxembourg | | heligmosomoides polygyrus | species | 2 | 0 |
| morocco | | heligmosomoides polygyrus polygyrus | subspecies | 4 | 0 |
| morocco | marrakech-tensift-al haouz | heligmosomoides polygyrus | species | 16 | 0 |
| norway | | heligmosomoides polygyrus | species | 5 | 0 |
| poland | | heligmosomoides polygyrus | species | 6 | 0 |
| poland | | heligmosomoides polygyrus polygyrus | subspecies | 1 | 0 |
| poland | lower silesia province | heligmosomoides polygyrus | species | 0 | 1 |
| poland | silesia province | heligmosomoides polygyrus | species | 0 | 1 |
| portugal | | heligmosomoides polygyrus polygyrus | subspecies | 1 | 0 |
| portugal | porto district | heligmosomoides polygyrus polygyrus | subspecies | 2 | 0 |
| romania | | heligmosomoides polygyrus polygyrus | subspecies | 3 | 0 |
| romania | caras-severin county | heligmosomoides polygyrus polygyrus | subspecies | 2 | 0 |
| russia | | heligmosomoides polygyrus polygyrus | subspecies | 1 | 0 |
| slovakia | | heligmosomoides polygyrus polygyrus | subspecies | 11 | 0 |
| slovakia | bratislava region | heligmosomoides polygyrus | species | 6 | 0 |
| slovenia | | heligmosomoides polygyrus | species | 2 | 0 |
| slovenia | municipality of brda | heligmosomoides polygyrus | species | 1 | 0 |
| slovenia | municipality of kocevje | heligmosomoides polygyrus | species | 1 | 0 |
| slovenia | municipality of vipava | heligmosomoides polygyrus | species | 6 | 0 |
| spain | | heligmosomoides polygyrus polygyrus | subspecies | 2 | 0 |
| spain | andalusia | heligmosomoides polygyrus | species | 5 | 0 |
| spain | asturias | heligmosomoides polygyrus | species | 10 | 0 |
| spain | balearic islands | heligmosomoides polygyrus | species | 50 | 0 |
| spain | castile and leon | heligmosomoides polygyrus | species | 4 | 0 |
| spain | catalonia | heligmosomoides polygyrus | species | 10 | 0 |
| spain | catalonia | heligmosomoides polygyrus polygyrus | subspecies | 3 | 0 |
| spain | navarra | heligmosomoides polygyrus | species | 5 | 1 |
| turkey | | heligmosomoides polygyrus corsicum | subspecies | 5 | 0 |
| turkey | rize province | heligmosomoides polygyrus corsicum | subspecies | 18 | 0 |
| united kingdom | england | heligmosomoides polygyrus | species | 0 | 1 |
| united kingdom | england | heligmosomoides polygyrus polygyrus | subspecies | 37 | 0 |
| united kingdom | northern ireland | heligmosomoides polygyrus | species | 0 | 1 |
| united kingdom | northern ireland | heligmosomoides polygyrus polygyrus | subspecies | 11 | 0 |
| united kingdom | scotland | heligmosomoides polygyrus polygyrus | subspecies | 2 | 0 |
| united kingdom | wales | heligmosomoides polygyrus polygyrus | subspecies | 1 | 0 |
| united states | california | heligmosomoides polygyrus | species | 0 | 1 |