I researched this a few years ago and didnt find that Caitlin Chock had broken 10 but the rest of your list matches what I found. I also included Lynn Bjorkland who ran a comparable time at 3K. Below is the list and narrative I compiled.
9:52.01+ Kim Mortensen, 1996
9:52.5++ Lynn Bjorklund, 1975
9:55.57+ Jordan Hasay, 2008
9:55.95+ Laurynne Chetelat, 2008
9:55.01i Melody Fairchild, 1991
9:56.84i Aisling Cuffe, 2011
"There have only been two high school Sub-10 Two Miles in US history - both run indoors. Melody Fairchild was first in 1991 running 9:55.01 at the national championship and in 2011, Aisling Cuffe, joined her running 9:56.84 at the same meet.
But along with these marks there have been four other Sub-10 equivalents turned over the 3000 and 3200 distances. Before Fairchild, Lynn Bjorklund set the 3000 record of 9:08.60 in 1975 during a US v. USSR dual meet in Kiev. In 1996 Kim Mortensen ran a 9:48.60 3200 in a CIF qualifying round that is recognized as the national record at the distance. And Jordan Hasay and Laurynne Chetelat staged the most thrilling dual at this distance in the 2008 California State Meet with Hasay winning in 9:52.13 to Chetelat's 9:52.51. "
For perspective, keep in mind that when Bjorklund ran that time, most High Schools didn't even have girl's track/cross country (pre- TitleIX). It's as if a runner from the '50's still had one of the best boy's performances ever.
According to Track and Field News lists:
9:52.01+ Kim Mortenson
9:52.5++ Lynn Bjorklund
9:54.22 Aisling Cuffe
9:55.57 Jordan Hasay
9:55.92i+ Melody Fairchild
9:55.95++ Cory Schubert
9:55.95+ Laurynne Chetelat
9:57.85++ Mary Shea
9:59.8++ Cathy Shiro
9:59.9++ Julie Shea
i = indoor
+ = converted 3200 m
++ = converted 3000 m
|The worm in the hole|
It wasn't official, but Emily Sisson ran 9:51.1 in 2010. It was a time trial with men pacing her through 3000. Watched it myself, and she made it look easy.
|where have you been??|
Sisson is running very well. She was the top frosh at NCAA Cross last year while at Wisconsin...ran 15:53 I think in the 5k final at NCAAs to place well...transferred to Providence for her sophomore year and was running very well in cross country (looking like a top 5-10 runner) before strep throat ended her season just before regionals.
She is running the mile this weekend at Terrier against some great competition...I think this could be a breakout track season for her. She looks much leaner and fitter this year than in years past.