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MO
Mary O'Brien
FemaleNew Jersey1998–2026
105
Total Finishes
70
Distinct Races
24
States (47%)
1:39:01
PR (7:34/mi)
2:22:06
Average
+0:13:15
Slower (first to last)
Medal House
2004
Rock 'n' Roll Arizona Marathon
1:50:13
#1459 overall#435 gender
2004
NYRR Fred Lebow Half Marathon
1:56:06
#1938 overall#427 gender
2004
NYCRUNS Brooklyn Ice Cream Social Half Marathon
1:56:07
#912 overall#142 gender
2003
Jersey Shore Half Marathon and 2 Mile Run
1:47:43
#188 overall#38 gender
2003
Santa Cruz Half Marathon
1:50:08
#261 overall#71 gender
2003
DEXTER-ANN ARBOR RUN
2:05:10
#1457 overall#471 gender
2002
Jersey Shore Half Marathon and 2 Mile Run
1:48:36
#188 overall#40 gender
2002
Rock ‘n’ Roll Philadelphia Half Marathon
2:19:45
#5814 overall#2156 gender
2000
Women's Half Marathon
2:12:48
#698 overall#697 gender
2000
Life Time Chicago Half Marathon + 5K
2:26:24
#4229 overall#1910 gender
1999
Rock ‘n’ Roll Philadelphia Half Marathon
1:50:34
#2743 overall#614 gender
1998
Kentucky Derby Festival Race Weekend
3:11:36
#6160 overall#2184 gender
Performance Timeline
Complete Race Log
| Year | Race | State | Time | Place |
|---|---|---|---|---|
| 2026 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 3:11:13 | #8550 |
| 2026 | The Louisiana MarathonBaton Rouge | LA | 3:24:26 | #2810 |
| 2026 | Austin MarathonAustin | TX | 3:24:51 | #14096 |
| 2025 | JSRC RunAPaloozaAsbury Park | NJ | 2:13:03 | #1330 |
| 2025 | Runapalooza Asbury ParkAsbury Park | NJ | 2:13:03 | #1338 |
| 2025 | Maine Coast MarathonWells | ME | 2:52:15 | #2326 |
| 2025 | Lost Dutchman MarathonApache Junction | AZ | 3:22:57 | #692 |
| 2025 | Lock 2 Lock Marathon/Half Marathon/10kWilliamsport | MD | 3:28:31 | #142 |
| 2025 | Freedom's RunShepherdstown | WV | 3:33:05 | #241 |
| 2025 | Freedom's RunShepherdstown | WV | 3:33:06 | #241 |
| 2024 | JSRC RunAPaloozaAsbury Park | NJ | 2:05:35 | #1018 |
| 2024 | Runapalooza Asbury ParkAsbury Park | NJ | 2:05:35 | #1012 |
| 2024 | NYRR Fred Lebow Half MarathonNew York | NY | 2:13:27 | #2658 |
| 2024 | Visit Tuscaloosa Half Marathon + 5KTuscaloosa | AL | 2:34:32 | #760 |
| 2023 | Mystic Half Marathon & 10KMystic | CT | 1:39:01 | #68 |
| 2023 | United Airlines NYC HalfNew York | NY | 1:52:06 | #7004 |
| 2023 | NYRR Fred Lebow Half MarathonNew York | NY | 2:11:09 | #3284 |
| 2022 | REVEL Big CottonwoodSalt Lake City | UT | 1:39:43 | #357 |
| 2022 | 2026 National Women's Half Marathon and 8KWashington | DC | 1:55:18 | #263 |
| 2022 | Grandma's MarathonDuluth | MN | 1:55:24 | #1820 |
| 2022 | Jersey Shore Half Marathon and 2 Mile RunHighlands | NJ | 2:04:36 | #237 |
| 2022 | Thanksgiving Day Half MarathonAtlanta | GA | 2:05:51 | #1845 |
| 2022 | Providence MarathonProvidence | RI | 2:48:58 | #1790 |
| 2021 | Frosty Half-MarathonRaynham | MA | 2:42:05 | #376 |
| 2021 | Providence Rhode RacesEast Providence | RI | 3:12:01 | #655 |
| 2020 | Grandma's MarathonDuluth | MN | 1:57:49 | #1068 |
| 2020 | NYRR Fred Lebow Half MarathonNew York | NY | 1:57:58 | #2145 |
| 2020 | 2027 Walt Disney World® Marathon WeekendOrlando | FL | 1:58:54 | #1157 |
| 2019 | Grandma's MarathonDuluth | MN | 1:48:40 | #1258 |
| 2019 | The LESS Popular Brooklyn Half Marathon!Brooklyn | NY | 1:57:43 | #10561 |
| 2019 | United Airlines NYC HalfNew York | NY | 2:10:41 | #14733 |
| 2019 | B.A.A. Half MarathonBoston | MA | 2:28:32 | #5059 |
| 2019 | Brooks Lake Sammamish Half Marathon presented by REIRedmond | WA | 2:46:08 | #1008 |
| 2019 | St. Jude Memphis Marathon WeekendMemphis | TN | 4:22:21 | #9388 |
| 2018 | Grandma's MarathonDuluth | MN | 1:53:50 | #1750 |
| 2018 | The LESS Popular Brooklyn Half Marathon!Brooklyn | NY | 1:58:04 | #10712 |
| 2018 | Shipyard Old Port Half MarathonPortland | ME | 1:58:37 | #1028 |
| 2018 | United Airlines NYC HalfNew York | NY | 2:05:38 | #11240 |
| 2018 | Boulder Rez HalfBoulder | CO | 2:25:16 | #78 |
| 2018 | Rock 'n' Roll Savannah Marathon & 1/2 MarathonSavannah | GA | 2:27:44 | #3584 |
| 2018 | Star Wars Half Marathon - The Dark SideLake Buena Vista | FL | 2:56:08 | #7628 |
| 2018 | 2026 Disney Wine & Dine Half Marathon WeekendOrlando | FL | 3:35:57 | #10951 |
| 2017 | AF Canyon Half Marathon, 10K & 5KAmerican Fork | UT | 1:47:42 | #424 |
| 2017 | Monterey Bay Half MarathonMonterey | CA | 1:48:20 | #728 |
| 2017 | United Airlines NYC HalfNew York | NY | 1:56:21 | #6922 |
| 2017 | E Murray Todd Half MarathonColts Neck | NJ | 2:04:12 | #277 |
| 2017 | Allianz Richmond Marathon, CarMax Richmond Half Marathon, & Richmond 8kRichmond | VA | 2:38:34 | #6314 |
| 2017 | Horseneck Half & 3.5 MilerWestport | MA | 2:39:21 | #493 |
| 2017 | B.A.A. Half MarathonBoston | MA | 2:45:39 | #5798 |
| 2017 | Rock ‘n’ Roll Philadelphia Half MarathonPhiladelphia | PA | 2:54:24 | #7653 |
| 2016 | Guthrie Wineglass Marathon, Wegmans Wineglass Half Marathon & Williams Toyota Wineglass 5KCorning | NY | 1:56:21 | #426 |
| 2016 | Lincoln MarathonLincoln | NE | 2:27:49 | #6166 |
| 2015 | Greater St. Louis MarathonSt. Louis | MO | 2:17:29 | #3450 |
| 2015 | Austin MarathonAustin | TX | 2:27:54 | #5759 |
| 2015 | Pittsburgh Marathon WeekendPittsburgh | PA | 2:35:13 | #11007 |
| 2015 | Seattle MarathonSeattle | WA | 2:41:52 | #4011 |
| 2015 | B.A.A. Half MarathonBoston | MA | 2:43:32 | #6039 |
| 2015 | South Shore Half Marathon and 5KHanover | MA | 3:27:11 | #1609 |
| 2014 | 17th Annual Myrtle Beach Mini Marathon & Coastal 5KMyrtle Beach | SC | 1:53:21 | #436 |
| 2014 | Get in GearMinneapolis | MN | 1:54:21 | #440 |
| 2014 | Garmin Olathe Marathon, Half Marathon and 10K in the land of OzOlathe | KS | 2:06:20 | #913 |
| 2014 | Pittsburgh Marathon WeekendPittsburgh | PA | 2:24:25 | #9705 |
| 2014 | Hyannis MarathonHyannis | MA | 2:35:00 | #2757 |
| 2013 | Key West Half Marathon & 5K, 8K, 10K, Rum Stroll & Beer MileKey West | FL | 1:53:34 | #207 |
| 2013 | 2025 Disney Princess Half Marathon Weekend presented by CORKCICLE®Orlando | FL | 1:54:34 | #444 |
| 2013 | Ralston Creek Half Marathon & 5KArvada | CO | 1:57:56 | #206 |
| 2013 | Greater St. Louis MarathonSt. Louis | MO | 2:21:52 | #4638 |
| 2013 | Seattle MarathonSeattle | WA | 2:47:42 | #5141 |
| 2012 | Novo Nordisk New Jersey MarathonLong Branch | NJ | 1:50:25 | #978 |
| 2012 | Runner's World Half Marathon and FestivalBethlehem | PA | 2:20:32 | #2323 |
| 2012 | Kirkland Half Marathon & 5KKirkland | WA | 2:26:28 | #770 |
| 2012 | Seattle MarathonSeattle | WA | 2:32:09 | #5229 |
| 2012 | Lost Dutchman MarathonApache Junction | AZ | 2:32:58 | #907 |
| 2012 | Cleveland Marathon & Half MarathonCleveland | OH | 2:59:55 | #6781 |
| 2012 | Divas Half Marathon & 5kWestbury | NY | 3:30:23 | #2547 |
| 2011 | Ocean City Running, 5k, Half MarathonOcean City | MD | 2:08:06 | #675 |
| 2011 | 2026 Disneyland® Half Marathon Weekend presented by HONDAAnaheim | CA | 2:27:44 | #4933 |
| 2009 | DEXTER-ANN ARBOR RUNDexter | MI | 2:07:13 | #1829 |
| 2009 | St. Jude Rock 'n' Roll SeattleSeattle | WA | 2:22:00 | #7775 |
| 2008 | United Airlines NYC HalfNew York | NY | 1:53:25 | #3049 |
| 2008 | DEXTER-ANN ARBOR RUNDexter | MI | 2:03:28 | #1485 |
| 2008 | 2025 500 Festival Running EventsIndianapolis | IN | 2:17:11 | #13765 |
| 2008 | Rock 'n' Roll Las VegasLas Vegas | NV | 2:49:09 | #5952 |
| 2007 | United Airlines NYC HalfNew York | NY | 1:57:30 | #4223 |
| 2007 | Detroit Free Press MarathonDetroit | MI | 2:04:58 | #1825 |
| 2007 | Dayton River Corridor ClassicDayton | OH | 2:15:57 | #446 |
| 2006 | Liberty Waterfront Half Marathon and 5K RunJersey City | NJ | 1:39:46 | #271 |
| 2006 | Novo Nordisk New Jersey MarathonLong Branch | NJ | 1:59:35 | #688 |
| 2006 | United Airlines NYC HalfNew York | NY | 2:05:17 | #5968 |
| 2006 | Nookachamps Winter RunsMount Vernon | WA | 2:15:20 | #250 |
| 2006 | Rock ‘n’ Roll Philadelphia Half MarathonPhiladelphia | PA | 2:22:51 | #8698 |
| 2006 | Detroit Free Press MarathonDetroit | MI | 2:49:29 | #4084 |
| 2005 | The LESS Popular Brooklyn Half Marathon!Brooklyn | NY | 1:54:39 | #1533 |
| 2005 | NYRR Fred Lebow Half MarathonNew York | NY | 1:59:29 | #2572 |
| 2005 | DEXTER-ANN ARBOR RUNDexter | MI | 2:13:44 | #1639 |
| 2005 | Capital City MarathonOlympia | WA | 2:40:42 | #810 |
| 2004 | Rock 'n' Roll Arizona MarathonPhoenix | AZ | 1:50:13 | #1459 |
| 2004 | NYRR Fred Lebow Half MarathonNew York | NY | 1:56:06 | #1938 |
| 2004 | NYCRUNS Brooklyn Ice Cream Social Half MarathonBrooklyn | NY | 1:56:07 | #912 |
| 2004 | DEXTER-ANN ARBOR RUNDexter | MI | 2:11:40 | #1654 |
| 2004 | Mercer Island Rotary Half MarathonMercer Island | WA | 2:13:35 | #962 |
| 2003 | Jersey Shore Half Marathon and 2 Mile RunHighlands | NJ | 1:47:43 | #188 |
| 2003 | Santa Cruz Half MarathonSanta Cruz | CA | 1:50:08 | #261 |
| 2003 | DEXTER-ANN ARBOR RUNDexter | MI | 2:05:10 | #1457 |
| 2002 | Jersey Shore Half Marathon and 2 Mile RunHighlands | NJ | 1:48:36 | #188 |
| 2002 | Rock ‘n’ Roll Philadelphia Half MarathonPhiladelphia | PA | 2:19:45 | #5814 |
| 2000 | Women's Half MarathonNew York | NY | 2:12:48 | #698 |
| 2000 | Life Time Chicago Half Marathon + 5KChicago | IL | 2:26:24 | #4229 |
| 1999 | Rock ‘n’ Roll Philadelphia Half MarathonPhiladelphia | PA | 1:50:34 | #2743 |
| 1998 | Kentucky Derby Festival Race WeekendLouisville | KY | 3:11:36 | #6160 |
States Raced
1 race 2 races 3-4 races 5+ races
State Breakdown
NYNew York
19 racesNJNew Jersey
11 racesWAWashington
9 racesMAMassachusetts
7 racesMIMichigan
7 racesPAPennsylvania
7 racesMNMinnesota
5 racesCACalifornia
3 racesCOColorado
2 racesGAGeorgia
2 racesMDMaryland
2 racesMEMaine
2 racesMOMissouri
2 racesOHOhio
2 racesTXTexas
2 racesUTUtah
2 racesCTConnecticut
1 raceDCDistrict of Columbia
1 raceILIllinois
1 raceINIndiana
1 raceKSKansas
1 raceKYKentucky
1 raceNENebraska
1 raceTNTennessee
1 race50-State Challenge
24/ 51 states + DC
27 states to go