Danish species per municipalities.

       
Common Clubtail (Gomphus vulgatissimus)
Denmark
Status: In Denmark stable and spreading to older known localities. Main localities are Gudenåen in Jylland, Susåen and adjacent water ways SC Sjælland and Lynge Grusgrav (Allerød) NE Sjælland. Also stable in the rest of the Nordic region and perhaps even spreading north in Sweden. Better water quality is part of the reason. Appears to show up accidentally far away from known breeding waters.

Not seen:
Endelave
Furesø:
1 accidental record near Søndersø 2014 (https://www.naturbasen.dk/observation?id=1251861), 2 historic records 1905-06.
Gribskov:
Few records north end Esrum Sø 2024 (https://www.naturbasen.dk/observation?id=4874385)
Holbæk:
1 undocumented record Bromølle 2020 (https://www.naturbasen.dk/observation?id=3401091)
Lyngby-Taarbæk:
Historic records Furesøen 1909-36.
Vejen:
Older records lakes near Jels, 1936 and 1991.
Varde:
1 accidental record Blåvand 2020 (https://www.naturbasen.dk/observation?id=3404221)
Vordingborg:
1 accidental record Kalvehave 2022 (https://www.inaturalist.org/observations/120505397)
Østdanmark
Allerød
Furesø
Gribskov
Holbæk
Lyngby-Taarbæk
Næstved
Ringsted
Sorø
Vordingborg
Midtjylland
Favrskov
Horsens
Ikast-Brande
Mariagerfjord
Silkeborg
Skanderborg
Viborg
Syddanmark
Varde
Vejen