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KO
Karen O'Brien
FemaleNew York1994–2026
86
Total Finishes
54
Distinct Races
17
States (33%)
1:24:31
PR (6:27/mi)
2:44:08
Average
+1:17:05
Slower (first to last)
Medal House
2010
Newport Marathon
2:02:10
#1152 overall#522 gender
2009
Gasparilla Distance Classic Race Weekend
2:35:06
#2795 overall#1358 gender
2009
Adirondack Marathon Distance Festival
3:00:41
#366 overall#250 gender
2008
Rock n Roll Nashville
2:40:24
#14797 overall#8308 gender
2007
Rock ‘n’ Roll Philadelphia Half Marathon
2:09:38
#7802 overall#3033 gender
2007
2027 Walt Disney World® Marathon Weekend
2:43:38
#6822 overall#3461 gender
2006
Tyranena Beer Run
2:06:00
#176 overall#74 gender
2002
Carlsbad Marathon
2:24:19
#2985 overall#1285 gender
2000
LONG ISLAND MARATHON FESTIVAL
2:44:13
#3426 overall#1136 gender
1999
2025 500 Festival Running Events
3:39:58
#17902 overall#8765 gender
1997
2025 500 Festival Running Events
2:08:35
#6676 overall#1558 gender
1994
LONG ISLAND MARATHON FESTIVAL
2:39:45
#5337 overall#1339 gender
Performance Timeline
Complete Race Log
| Year | Race | State | Time | Place |
|---|---|---|---|---|
| 2026 | Game On! Marathon of the Treasure CoastStuart | FL | 2:12:07 | #273 |
| 2026 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 3:44:55 | #14718 |
| 2026 | 2026 Disneyland® Half Marathon Weekend presented by HONDAAnaheim | CA | 3:56:50 | #11835 |
| 2025 | ASICS Susquehanna River Running Festival presented by University of Maryland Upper Chesapeake HealthHavre de Grace | MD | 2:13:50 | #362 |
| 2025 | Susquehanna River Running FestivalHavre de Grace | MD | 2:13:51 | #362 |
| 2025 | Disneyland® Halloween Half Marathon Weekend 2025Anaheim | CA | 3:46:46 | #10872 |
| 2025 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 3:50:43 | #14413 |
| 2025 | 2027 Walt Disney World® Marathon WeekendOrlando | FL | 3:57:54 | #12908 |
| 2024 | United Airlines NYC HalfNew York | NY | 2:17:18 | #18908 |
| 2024 | 2026 Disneyland® Half Marathon Weekend presented by HONDAAnaheim | CA | 3:43:21 | #10333 |
| 2024 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 4:04:01 | #15045 |
| 2024 | 2026 Disney Wine & Dine Half Marathon WeekendOrlando | FL | 4:07:29 | #13524 |
| 2023 | GPS Half MarathonSparks | MD | 2:03:45 | #42 |
| 2023 | Women's Half MarathonNew York | NY | 2:15:09 | #2824 |
| 2023 | Pocantico Hills RacesTarrytown | NY | 2:21:24 | #151 |
| 2023 | Rochester Regional Health Flower City ChallengeRochester | NY | 3:27:01 | #777 |
| 2023 | 2027 Walt Disney World® Marathon WeekendOrlando | FL | 3:32:04 | #11945 |
| 2023 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 3:41:07 | #12548 |
| 2023 | 2026 Disney Wine & Dine Half Marathon WeekendOrlando | FL | 3:42:12 | #11826 |
| 2022 | NCR Marathon & Half MarathonSparks Glencoe | MD | 2:08:50 | #232 |
| 2022 | Key West Half Marathon & 5K, 8K, 10K, Rum Stroll & Beer MileKey West | FL | 2:11:07 | #455 |
| 2022 | GPS Half MarathonSparks | MD | 2:11:32 | #65 |
| 2022 | Yonkers MarathonYonkers | NY | 2:15:31 | #170 |
| 2022 | Rochester Regional Health Flower City ChallengeRochester | NY | 3:13:24 | #780 |
| 2022 | 2026 Disney Wine & Dine Half Marathon WeekendOrlando | FL | 3:34:39 | #9660 |
| 2022 | 2027 Walt Disney World® Marathon WeekendOrlando | FL | 3:35:07 | #11183 |
| 2022 | Guthrie Wineglass Marathon, Wegmans Wineglass Half Marathon & Williams Toyota Wineglass 5KCorning | NY | 4:40:45 | #1845 |
| 2021 | Bethany Beach Lifesaving MileBethany Beach | DE | 2:07:18 | #50 |
| 2021 | Schaumburg Turkey Trot Half Marathon & 5KElk Grove Village | IL | 3:00:39 | #890 |
| 2021 | 2026 Disney Wine & Dine Half Marathon WeekendOrlando | FL | 3:29:40 | #8113 |
| 2020 | 3M Half MarathonAustin | TX | 2:09:15 | #3054 |
| 2020 | Austin MarathonAustin | TX | 2:13:17 | #3305 |
| 2020 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 4:14:21 | #20285 |
| 2019 | ASICS Susquehanna River Running Festival presented by University of Maryland Upper Chesapeake HealthHavre de Grace | MD | 2:10:54 | #235 |
| 2019 | Susquehanna River Running FestivalHavre de Grace | MD | 2:10:55 | #235 |
| 2019 | Flying Pig Pump and RunCincinnati | OH | 2:50:59 | #8531 |
| 2019 | Rochester Regional Health Flower City ChallengeRochester | NY | 3:23:38 | #1567 |
| 2019 | Winter Warrior Half Marathon, Quarter Marathon & Half Marathon RelayRochester | NY | 3:32:33 | #526 |
| 2019 | Shoreline Half Marathon & 5KHamlin | NY | 3:38:09 | #410 |
| 2019 | 2026 Disney Wine & Dine Half Marathon WeekendOrlando | FL | 3:52:06 | #12573 |
| 2019 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 3:53:23 | #18936 |
| 2018 | ASICS Susquehanna River Running Festival presented by University of Maryland Upper Chesapeake HealthHavre de Grace | MD | 2:13:14 | #358 |
| 2018 | Susquehanna River Running FestivalHavre de Grace | MD | 2:13:15 | #358 |
| 2018 | 2026 Disney Wine & Dine Half Marathon WeekendOrlando | FL | 3:31:35 | #10430 |
| 2017 | 3M Half MarathonAustin | TX | 1:59:51 | #1868 |
| 2017 | Austin MarathonAustin | TX | 2:09:35 | #2148 |
| 2017 | Race 13.1 BaltimoreBaltimore | MD | 2:22:34 | #750 |
| 2017 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 2:36:30 | #4442 |
| 2017 | Martian Invasion of the RacesDearborn | MI | 2:41:04 | #828 |
| 2016 | MERCY HEALTH GLASS CITY MARATHONToledo | OH | 1:58:09 | #880 |
| 2016 | Monster Mash Marathon & Half MarathonDover | DE | 1:59:38 | #80 |
| 2016 | Race 13.1 BaltimoreBaltimore | MD | 2:03:44 | #374 |
| 2016 | Decker Challenge and Brown Santa 5KAustin | TX | 2:09:06 | #424 |
| 2016 | Rock 'n' Roll Las VegasLas Vegas | NV | 2:18:12 | #6286 |
| 2016 | Navy Air Force Half Marathon & Navy 5-MilerWashington | DC | 2:20:24 | #2894 |
| 2015 | Coastal Delaware Running FestivalDewey Beach | DE | 1:24:31 | #285 |
| 2015 | 3M Half MarathonAustin | TX | 1:55:24 | #1768 |
| 2015 | MERCY HEALTH GLASS CITY MARATHONToledo | OH | 1:55:52 | #864 |
| 2015 | B.A.A. Half MarathonBoston | MA | 2:00:36 | #2821 |
| 2015 | Austin MarathonAustin | TX | 2:03:14 | #2607 |
| 2015 | St. Michaels Running FestivalSaint Michaels | MD | 2:07:16 | #443 |
| 2015 | Bird-in-Hand Half Marathon, 5K, and Kid's Fun RunBird In Hand | PA | 2:08:11 | #599 |
| 2015 | Key Largo Bridge RunKey Largo | FL | 2:20:44 | #39 |
| 2015 | Binghamton Bridge RunBinghamton | NY | 3:00:42 | #1004 |
| 2014 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 1:56:32 | #480 |
| 2014 | BCS College Station MarathonCollege Station | TX | 1:59:20 | #462 |
| 2014 | Annapolis Running ClassicAnnapolis | MD | 2:09:50 | #1318 |
| 2014 | Divas Half MarathonLeesburg | VA | 2:10:08 | #369 |
| 2014 | Frederick Running FestivalFrederick | MD | 2:10:12 | #2026 |
| 2014 | Love Run Half MarathonPhiladelphia | PA | 2:19:16 | #4697 |
| 2013 | MERCY HEALTH GLASS CITY MARATHONToledo | OH | 1:56:11 | #625 |
| 2013 | Boston's Run To RememberBoston | MA | 2:02:59 | #3403 |
| 2013 | Key Largo Bridge RunKey Largo | FL | 2:32:09 | #105 |
| 2013 | 2026 National Women's Half Marathon and 8KWashington | DC | 3:07:30 | #12909 |
| 2012 | 3M Half MarathonAustin | TX | 1:54:54 | #1678 |
| 2012 | 2026 Disney Wine & Dine Half Marathon WeekendOrlando | FL | 2:35:58 | #5478 |
| 2012 | Cleveland Marathon & Half MarathonCleveland | OH | 2:45:04 | #6212 |
| 2011 | Boston's Run To RememberBoston | MA | 2:20:51 | #3955 |
| 2011 | Kiawah Island MarathonKiawah Island | SC | 2:42:07 | #1922 |
| 2011 | See Jane Run Half MarathonSeattle | WA | 3:02:17 | #1170 |
| 2010 | Newport MarathonNewport | RI | 2:02:10 | #1152 |
| 2010 | 2026 - San Antonio MarathonSan Antonio | TX | 2:14:53 | #7783 |
| 2010 | Rock 'n' Roll Virgina Beach Half MarathonVirginia Beach | VA | 3:35:41 | #14222 |
| 2009 | Gasparilla Distance Classic Race WeekendTampa | FL | 2:35:06 | #2795 |
| 2009 | Adirondack Marathon Distance FestivalSchroon Lake | NY | 3:00:41 | #366 |
| 2008 | Rock n Roll NashvilleNashville | TN | 2:40:24 | #14797 |
| 2007 | Rock ‘n’ Roll Philadelphia Half MarathonPhiladelphia | PA | 2:09:38 | #7802 |
| 2007 | 2027 Walt Disney World® Marathon WeekendOrlando | FL | 2:43:38 | #6822 |
| 2006 | Tyranena Beer RunLake Mills | WI | 2:06:00 | #176 |
| 2002 | Carlsbad MarathonCarlsbad | CA | 2:24:19 | #2985 |
| 2000 | LONG ISLAND MARATHON FESTIVALEast Meadow | NY | 2:44:13 | #3426 |
| 1999 | 2025 500 Festival Running EventsIndianapolis | IN | 3:39:58 | #17902 |
| 1997 | 2025 500 Festival Running EventsIndianapolis | IN | 2:08:35 | #6676 |
| 1994 | LONG ISLAND MARATHON FESTIVALEast Meadow | NY | 2:39:45 | #5337 |
States Raced
1 race 2 races 3-4 races 5+ races
State Breakdown
FLFlorida
24 racesMDMaryland
14 racesNYNew York
14 racesTXTexas
10 racesOHOhio
5 racesCACalifornia
4 racesMAMassachusetts
3 racesINIndiana
2 racesVAVirginia
2 racesILIllinois
1 raceMIMichigan
1 raceWAWashington
1 raceWIWisconsin
1 raceALAlabama
0 racesCTConnecticut
0 racesNCNorth Carolina
0 racesNJNew Jersey
0 races50-State Challenge
17/ 51 states + DC
34 states to go