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Apr 20–26
Alexander The Great Marathon·Whidbey Island Marathon·TCS World 10K·Marathon de Nantes·Blackpool Marathon·Rock n Roll Madrid Marathon·Brooklyn Half Marathon·Gettysburg North-South Marathon·Mississauga Marathon·Santiago Marathon·Maui Marathon·Big Sur International Marathon·Jim Thorpe Marathon·Glass City Marathon·Hamburg Marathon·Oklahoma City OKC Memorial Marathon·Eugene Marathon·Gopher Attack Marathon·2Slow4Boston Marathon·Kalamazoo Marathon·London Marathon·Ballarat Marathon
Apr 27–May 3
Wild West Marathon & Ultra·Texas Switchback Trail Race·Brainerd Jaycees Run for the Lakes Marathon·Potomac River Run Marathon·Muddy River Marathon·Miwok 100K·OneAmerica 500 Festival Mini-Marathon·Shiprock Marathon·La Crosse Marathon·IronHorse Marathon·Great Allegheny Ohiopyle Marathon·Blue Cross Broad Street Run·ColleMar-athon·Stramilano Run Generation·Walter Childs Marathon·York Marathon·Prague Marathon·Maas Marathon De La Basse-Meuse·Great Limerick Run·Lilac Bloomsday 12K·Great Birmingham Run·Des Moines Women's Half Marathon·Three Forts Marathon·Georgina Spring Fling Marathon·Charles River Marathon·Eau Claire Marathon·Chicagoland Spring Marathon·Tacoma City Marathon·Pittsburgh Marathon·Belfast City Marathon·Avenue of the Giants Marathon·Cincinnati Flying Pig Marathon·OC Marathon·Toronto GoodLife Marathon·Colorado Marathon·Vancouver Marathon·Long Island Marathon·Lincoln Marathon·Maine Coast Marathon·Hudson Valley Marathon·Providence Rhode Races Marathon
May 4–10
Milton Keynes MK Marathon·Maple Leaf Marathon·Gum Tree 10K·Quicksilver 100K & 50K·Beat the Bridge·Starved Rock Country Marathon·Granite State Marathon·Santa Barbara Wine Country Half Marathon·Greenbrier Half Marathon·Amway River Bank Run·Lake Wobegon Trail Marathon·Cape Town 10K·Run Gatwick·Maratona dell'Isola d'Elba·Geneva Marathon·Leiden Marathon·Pine Tree Marathon·Great Bristol Run·Copenhagen Marathon·Fredericton Marathon
May 11–17
Harpoon 5 Miler·Timp Trail Marathon·Famous Idaho Potato Marathon·RBC Brooklyn Half Marathon·Mattoni Karlovy Vary Half Marathon·Whitefish Marathon·Helsinki City Running Day·Three Hearts Marathon·Madeline Island Marathon·Sehgahunda Trail Marathon·Ogden Marathon·New River Marathon·JH Rhody Run·Sugarloaf Marathon·Navy Bay Bridge Run·Capitol Hill Classic·Bay to Breakers·Riga Marathon·Windermere Marathon·Capital City Marathon·Marine Corps Historic Half·Beer Lovers Marathon·Salzburg Marathon·Steel Rail Marathon & Half·Red Deer Marathon (Woodys RV World Marathon)·Med City Marathon·Colfax Marathon·Cleveland Marathon·Blue Nose Marathon·Epic Marathon·Armed Service Marathon
May 18–24
Gothenburg Half Marathon·Beaverhead Marathon·Glendalough 'Lap of the Gap' Marathon·Bill Snyder Highway Half and 5K·Prince of Wales Alaska Marathon·Bayshore Marathon·Miles on the Mohawk Marathon·Lima Marathon (Maraton De Lima)·Edinburgh Marathon·Boston's Run To Remember Half Marathon·Minocqua Northwoods Escape Marathon·Sudbury Rocks Marathon·Cape Town Marathon·Vermont City Marathon·Calgary Marathon·Ottawa Marathon·Coeur d'Alene Marathon (CDA Marathon)·Buffalo Marathon
May 25–31
Boulder Boulder·Old Colony Marathon·Nutmeg State Marathon·Virginia Wine Country Half Marathon·Stockholm Marathon·Fargo Marathon·Red Island State Marathon·Great Manchester Run·Saskatchewan Marathon·Newport Marathon - Oregon·Carmel Marathon·Rock n Roll San Diego Marathon·Course des Pompiers Marathon
Jun 1–7
Green River Marathon·Utah Valley Marathon·1/2 Sauer 1/2 Kraut Marathon·MISH Waterfront Marathon·La Champenoise 18K·Zip Code 07662 Marathon·Seaside Marathon·Casper Marathon·Steamboat Marathon·Deadwood-Mickelson Trail Marathon·Holy Family Memorial Maritime Marathon·The Great Bangor Marathon and Half·Light at the End of the Tunnel Marathon·Aruba Marathon·XCelsior Marathon·North Olympic Discovery Marathon