Hylaeus mesillae
- kingdom: Animalia
- phylum: Arthropoda
- class: Insecta
- order: Hymenoptera
- family: Colletidae
- genus: Hylaeus
- species: Hylaeus mesillae
Stafford
Connecticut- Forest Park
- Oak Park
- River Forest
Illinois- Carter Lake
Iowa- Bar Harbor
Maine- Adelphi
- Beltsville
- Berwyn Heights
- Boonsboro
- Brookmont
- Charlotte Hall
- Chevy Chase Village
- Chillum
- College Park
- Fort George G Mead Junction
- Frederick
- Friendship Village
- Gambrills
- Greenbelt
- Langley Park
- Maryland City
- Mountain Lake Park
- Oakland
- Princess Anne
- Somerset
- Takoma Park
- University Park
- Williamsport
Maryland- Creve Coeur
Missouri- Omaha
Nebraska- Short Hills
- Smithville
- Wanaque
New Jersey- Las Cruces
New Mexico- Newport
Ohio- Collingdale
- Colonial Park
- Colwyn
- Darby
- Penbrook
- Progress
- Sharon Hill
- Valley Green
Pennsylvania- Wolf Trap
Virginia- Washington, D. C.
Washington, D.C.- Saint Marys
- Terra Alta
West Virginia- Madison
Wisconsin
United States