| Event | Rank | Mark | By | Meet |
| B-400 | 1 | 47.84 | Westlund, Isaac (2015) (Archbishop Murphy, WA) (US#89) | WA 2A State Meet(WA), 2015-05-30(#1) |
| | | National Elites above. State Elites below | | |
| B-400 | 2 | 48.23 | Rhoads, Michael (2016) (Inglemoor, WA) | Shoreline Invitational(WA), 2015-05-02(#1) |
| B-400 | 3 | 48.28 | Croson, Ryan (2015) (Bothell, WA) | Shoreline Invitational(WA), 2015-05-02(#2) |
| B-400 | 4 | 48.42 | Frye, Dejuan (2015) (River Ridge, WA) | WA 2A State Meet(WA), 2015-05-30(#2) |
| B-400 | 5 | 48.51 | Young, Christian (2015) (Pasco, WA) | WA 3A/4A MCC District Championships(WA), 2015-05-15(#1) |
| B-400 | 6 | 49.04 | Moore, Phillip (2015) (Eastmont, WA) | Davis and Sunnyside at Eastmont(WA), 2015-04-22(#1) |
| B-400 | 7 | 49.15 | Gardner, Ethan (2015) (Walla Walla, WA) | WA 4A State Meet(WA), 2015-05-30(#3) |
| B-400 | 8 | 49.16 | Mafilas, Evan (2017) (O'Dea, WA) | WA 3A State Meet(WA), 2015-05-30(#1) |
| B-400 | 9 | 49.20 | Lovercamp, Reid (2015) (Wenatchee, WA) | WA 4A State Meet(WA), 2015-05-30(#4) |
| B-400 | 10 | 49.26 | Woodley, Dominique (2015) (Clover Park, WA) | WA 2A State Meet(WA), 2015-05-30(#3) |
| B-400 | 10 | 49.26 | Barton, Nate (2015) (Kent Meridian, WA) | WA 4A WCD Distict III Championships(WA), 2015-05-23(#1) |
| B-400 | 12 | 49.27 | Ulrich, Jake (2017) (Eastmont, WA) | WA 4A CBBN District Championships(WA), 2015-05-23(#1) |
| B-400 | 13 | 49.35 | Ruiz, Cortez (2015) (Chiawana, WA) | WA 3A/4A MCC District Championships(WA), 2015-05-15(#3) |
| B-400 | 14 | 49.41 | Elmore, Jaleel (2016) (Olympic, WA) | WA 2A WCD District III Championships(WA), 2015-05-23(#1) |
| B-400 | 15 | 49.44 | Stauffer, Nicholas (2015) (Stadium, WA) | WA 4A WCD Distict III Championships(WA), 2015-05-23(#2) |
| B-400 | 16 | 49.46 | Devroe, Dejon (2015) (Oak Harbor, WA) | Lake Stevens @ Oak Harbor(WA), 2015-04-02(#1) |
| B-400 | 17 | 49.53 | Wells, Emmanuel (2016) (Rainier Beach, WA) | Metro Championships(WA), 2015-05-15(#2) |
| B-400 | 18 | 49.64 | Demaris, Will (2015) (Glacier Peak, WA) | WA 3A State Meet(WA), 2015-05-30(#1) |
| B-400 | 19 | 49.68 | Hudson, Ilijah (2017) (Mt Tahoma, WA) | WA 3A WCD/SWD District Championships(WA), 2015-05-23(#1) |
| B-400 | 20 | 49.70 | Brown, Austin (2016) (Tahoma, WA) | Pasco Invitational(WA), 2015-04-18(#3) |
| B-400 | 20 | 49.70 | Rouser, Garrett (2015) (Kingston, WA) | WA 2A State Meet(WA), 2015-05-30(#2) |
| B-400 | 22 | 49.71 | Ryan, Adam (2016) (Camas, WA) | WA 4A State Meet(WA), 2015-05-30(#6) |
| B-400 | 23 | 49.72 | Miller, Nick (2015) (Meridian, WA) | WA 1A Bi-District Finals(WA), 2015-05-23(#1) |
| B-400 | 24 | 49.82 | Carroll, Cameron (2016) (Central Kitsap, WA) | Central Kitsap at South Kitsap(WA), 2015-05-07(#1) |
| B-400 | 25 | 49.88 | Richmond, Jack (2018) (Bellevue, WA) | WA 3A Sea-King District Championships(WA), 2015-05-22(#3) |
| B-400 | 26 | 49.93 | Palmer, Jason (2016) (Federal Way, WA) | Kent-Meridian Invitational(WA), 2015-03-28(#1) |
| B-400 | 27 | 51.41 | Pullin, Aaron (2015) (Centralia, WA) | Arcadia Multis(CA), 2015-04-10(#4) |
| B-400 | 28 | 52.11 | Rodeman, James (2015) (Yelm, WA) | Arcadia Multis(CA), 2015-04-10(#5) |
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| | | See more performances for B-400 | | |
