2003 AC100 Ethan & Dean. Photo: Nick Karnazes. Read Dean Karnazes’ race report here.
| Place | Name | Age | M/F | Finish | City | State | GP | Pre Fin |
|---|---|---|---|---|---|---|---|---|
| 1 | Jorge Pacheco | 34 | M | 18:52.4 | Los Angeles | CA | M1 | 12 |
| 2 | Andy Jones-Wilkins | 36 | M | 20:07.5 | Oakland | CA | M2 | 4 |
| 3 | Guillermo Medina | 28 | M | 20:45.2 | Valley Village | CA | M3 | 10 |
| 4 | Dean Karnazes | 41 | M | 21:21.3 | San Francisco | CA | M4 | 1 |
| 5 | Joseph Kulak | 35 | M | 22:16.2 | Lakewood | CO | M5 | 1 |
| 6 | Craig Thornley | 39 | M | 22:31.3 | Eugene | OR | M6 | 2 |
| 7 | Angel Perez | 32 | M | 22:48.3 | Moreno Valley | CA | M7 | 7 |
| 8 | Adalberto Mendoza | 51 | M | 23:07.3 | Burbank | CA | M8 | 11 |
| 9 | John Pearch | 30 | M | 23:10.5 | Olympia | WA | M9 | 1 |
| 10 | Whit Rambach | 36 | M | 23:52.0 | Los Gatos | CA | M10 | 2 |
| 11 | Rafael Arceo | 35 | M | 24:37.3 | West Covina | CA | M11 | 10 |
| 12 | Diana Finkel | 31 | F | 24:39.1 | South Fork | CO | F1 | 1 |
| 13 | Tracy Bahr | 31 | F | 25:41.2 | Bend | OR | F2 | 2 |
| 14 | Jussi Hamalainen | 56 | M | 26:04:20 | Agoura Hills | CA | M12 | 28 |
| 15 | Wally Hesseltine | 60 | M | 26:23.4 | Lafayette | CA | M13 | 5 |
| 16 | Denis Trafecanty | 60 | M | 26:45.2 | Santa Ysabel | CA | M14 | 4 |
| 17 | Dan Williams | 54 | M | 26:54.3 | Lafayette | CA | M15 | 3 |
| 18 | Bill Kee | 48 | M | 27:05.6 | Ojai | CA | M16 | 5 |
| 19 | David Van Wicklin | 51 | M | 27:07.2 | Foresthill | CA | M17 | 1 |
| 20 | Rod Bien | 31 | M | 27:13.3 | Bend | OR | M18 | 2 |
| 21 | Jimmy Fullerton | 49 | M | 27:15.6 | Pico Rivera | CA | M19 | 5 |
| 22 | Stacey Bunton | 40 | F | 27:17.1 | Portland | OR | F3 | 3 |
| 23 | Wendell Doman | 44 | M | 28:06.1 | Walnut Creek | CA | M20 | 1 |
| 24 | William Ramsey | 50 | M | 28:08.5 | Aliso Viejo | CA | M21 | 10 |
| 25 | Hal Chiasson | 60 | M | 28:38.5 | Sierra Madre | CA | M22 | 6 |
| 26 | Stephen Harris | 49 | M | 28:50.0 | Harbor City | CA | M23 | 11 |
| 27 | Charles Park | 49 | M | 28:55.3 | West Covina | CA | M24 | 1 |
| 28 | Scott Parker | 39 | M | 29:00.1 | Hoover | AL | M25 | 3 |
| 29 | Fenton Cross | 59 | M | 29:01.1 | Flintridge | CA | M26 | 8 |
| 30 | Jack Murray | 42 | M | 29:13.3 | Los Angeles | CA | M27 | 3 |
| 31 | Bob Bachani | 48 | M | 29:41.1 | Tuscon | AZ | M28 | 1 |
| 32 | Troy Limb | 42 | M | 29:41.3 | Pollock Pines | CA | M29 | 3 |
| 33 | Howie Stern | 33 | M | 29:43.2 | Mammoth Lakes | CA | M30 | 9 |
| 34 | Jason Lakey | 28 | M | 29:54.5 | Bishop | CA | M31 | 1 |
| 35 | Mike Stephens | 45 | M | 30:07.4 | Simi Valley | CA | M32 | 10 |
| 36 | Tommy Gallagher | 46 | M | 30:15.0 | Reno | NV | M33 | 8 |
| 37 | Keith Richards-Dinger | 21 | M | 30:16.2 | Ridgecrest | CA | M34 | 2 |
| 38 | Jerry Bloom | 50 | M | 30:17.2 | Shingle Springs | CA | M35 | 2 |
| 39 | Barry Fisher | 58 | M | 30:20.1 | Fair Oaks | CA | M36 | 1 |
| 40 | Gary Inouye | 50 | M | 30:40.2 | Monterey Park | CA | M37 | 1 |
| 41 | Julie Wu Hsieh | 29 | F | 30:40.2 | Monterey Park | CA | F4 | 1 |
| 42 | Bobb Ankeney | 50 | M | 30:44.6 | Placerville | CA | M38 | 1 |
| 43 | Jeff Kozak | 29 | M | 30:52.5 | Bishop | CA | M39 | 1 |
| 44 | Steve Teal | 38 | M | 30:52.6 | Phelan | CA | M40 | 1 |
| 45 | Robert Barr | 48 | M | 31:08.5 | Costa Mesa | CA | M41 | 1 |
| 46 | Kevin Lutz | 46 | M | 31:21.6 | Santa Clarita | CA | M42 | 1 |
| 47 | Scott Sullivan | 44 | M | 31:22.4 | Culver City | CA | M43 | 10 |
| 48 | Brent Speers | 45 | M | 31:25.1 | Phelan | CA | M44 | 5 |
| 49 | Garry Curry | 49 | M | 31:25.1 | Boulder | CO | M45 | 26 |
| 50 | Mike Palmer | 49 | M | 31:31.2 | Berkley | CA | M46 | 13 |
| 51 | Curtis B. Davis | 38 | M | 31:37.5 | Ridgecrest | CA | M47 | 2 |
| 52 | Lorraine Sorensen | 53 | F | 31:39.4 | Capitola | CA | F5 | 1 |
| 53 | Catra Corbett-McNeely | 38 | F | 31:40.5 | Fremont | CA | F6 | 1 |
| 54 | Manuel G. Garcia | 54 | M | 31:44.2 | Temple City | CA | M48 | 1 |
| 55 | Charlie Murdach | 34 | M | 31:48.5 | San Francisco | CA | M49 | 1 |
| 56 | John Radich | 49 | M | 31:50.0 | Monrovia | CA | M50 | 6 |
| 57 | Wendy Young | 47 | F | 32:00.4 | Simi Valley | CA | F7 | 2 |
| 58 | Nadia Costa | 32 | F | 32:00.4 | Orinda | CA | F8 | 1 |
| 59 | Larry Hall | 49 | M | 32:02.2 | Lakebluff | IL | M51 | 1 |
| 60 | Dan Bratches | 35 | M | 32:03.4 | Portland | ME | M52 | 1 |
| 61 | Eric Kajiwara | 56 | M | 32:08.6 | Ridgecrest | CA | M53 | 10 |
| 62 | Charlie Mercer | 33 | M | 32:10.5 | Beverly Hills | CA | M54 | 1 |
| 63 | J. R. Young | 44 | M | 32:21.0 | Simi Valley | CA | M55 | 1 |
| 64 | Vicki DeVita | 50 | F | 32:26.1 | Acton | CA | F9 | 2 |
| 65 | Karlheinz Kobus | 37 | M | 32:28.3 | Sinsheim, Germany | GR | M56 | 1 |
| 66 | Tim Sheedy | 54 | M | 32:30.1 | Pasadena | CA | M57 | 2 |
| 67 | Terry Rhodes | 47 | F | 32:35.1 | Reno | NV | F10 | 1 |
| 68 | John Rhodes | 55 | M | 32:35.1 | Reno | NV | M58 | 1 |
| 69 | Kenneth Hubbard | 56 | M | 32:45.3 | Mechanisville | VA | M59 | 1 |
| 70 | Michael Bur | 38 | M | 32:50.3 | Kensington | MD | M60 | 2 |
| 71 | Linda McFadden | 41 | F | 32:56.1 | Modesto | CA | F11 | 1 |