I found a list online - not just for MCPS of course:
https://blog.prepscholar.com/academic-honors-examples-college-application
Advanced Placement (AP) Awards
AP International Diploma (APID)
AP Scholar
AP Scholar with Distinction
AP Scholar with Honor
DoDEA AP Scholar
International AP Scholar
National AP Scholar
State AP Scholar
IB Awards
IB Diploma
IB Middle Years Programme (MYP) Certificate
National Awards
Governor’s Volunteer Award
National Student Volunteer Award
President’s Award for Educational Achievement
President’s Award for Educational Excellence
President’s National Service Award
PSAT Awards
National Hispanic Scholar
National Merit Commended Student
National Merit Finalist
National Merit Scholar
National Merit Semifinalist
School-based National Merit Scholarship winner
School-Based Awards
Foreign language award
High class rank (e.g., top 10%)
Honor roll/GPA award
National Honor Society membership
Perfect Attendance Award
School-specific award
School subject-specific award
Student of the Month/Term/Year
Subject-specific Honor Society membership (e.g., Science Honor Society)
Competitions and Contests
Award for high placement (1st, 2nd, 3rd, or 4th) or participation in any major (academic) contest, such as the following:
AAN Neuroscience Research Prize
Academic Decathlon
Academic Triathlon
American Regions Mathematics League (ARML)
B.E.S.T. Robotics Design contest
Conrad Spirit of Innovation Challenge
Davidson Fellows Scholarship
Doodle 4 Google
Google Science Fair
Intel International Science and Engineering Fair (ISEF)
International BioGENEius Challenge
International Chemistry Olympiad
International Mathematical Olympiad
International Photography Awards (IPA)
Kids Philosophy Slam
LifeSmarts
Microsoft Imagine Cup
MIT INSPIRE
MIT THINK Scholars Program
Model UN
National Academic League
National Academic Quiz Tournament
National Economics Challenge by CEE
National Geographic Bee
National Geographic Student Photo Contest
National High School Mock Trial Championship
National Science Bowl
National Science Olympiad
PhysicsBowl
Quiz Bowl
Regeneron Science Talent Search (STS)
Regional/National Junior Science and Humanities Symposium
Scholastic Art & Writing Awards
Toshiba/NSTA ExploraVision Awards
University Interscholastic League (UIL)
Miscellaneous Awards (These go under Extracurriculars I think)
Boy Scouts/Eagle Scouts awards
Employee of the Month
Girl Scouts awards
Merit scholarships for college
Musical performance award
National Novel Writing Month (NaNoWriMo) winner
National Poetry Writing Month (NaPoWriMo) winner
Publications (such as short stories, art pieces, essays, etc.)
Volunteer award
Work award or promotion
One I don't see listed but I think could be a school based award would be if a student received an award in the school's Science Fair?