The Chicago Marathon is renowned as one of the fastest marathon courses in the world, offering runners a flat and highly efficient route through the heart of one of America’s greatest cities. Starting and finishing in Grant Park, the course winds through 29 diverse neighborhoods, showcasing Chicago’s iconic architecture, vibrant cultural districts, historic streets, and energetic communities. From the skyscrapers of downtown Chicago to the lively neighborhoods of Lincoln Park, Pilsen, Chinatown, and Bronzeville, runners experience a constantly changing urban landscape backed by the support of more than a million spectators. The combination of minimal elevation change, cool October temperatures, exceptional race organization, and unparalleled crowd support has made the Chicago Marathon a preferred destination for elite athletes chasing records and recreational runners pursuing personal bests alike.