I will attempt this and keep in mind that this is unofficial. It is also not in a particular order.
#1. Attended Buffalo's Bennett High/St. Bonaventure:
https://en.wikipedia.org/wiki/Bob_Lanier (arguably the best player in relation to this thread and maybe even from Upstate NY in general as a Basketball Hall of Famer)
#2. Attended Buffalo's Riverside High/UConn:
https://en.wikipedia.org/wiki/Cliffo...all,_born_1966) (Late bloomer that was arguably UConn's first real star player in the Big East and had longest NBA career on the list)
#3. Attended Greece's Athena High/Syracuse:
https://en.wikipedia.org/wiki/John_Wallace_(basketball) (Was the NY State Player of the Year in 1992)
#4. Attended Albany's Phillip Schuyler High/Utah:
https://en.wikipedia.org/wiki/Luther_Burden (originally from Haines City FL, his nephew lives in the Syracuse area and is a P.A. at a local hospital(also starred at Albany Academy and was a walk on at Canisius)
#5. Attended Rochester's East High/Niagara:
https://en.wikipedia.org/wiki/Al_Butler
https://www.nasljerseys.com/EBA/Players/B/Butler.Al.htm (originally from Birmingham AL, was in the first Parade High School All-American class in 1957 on the first team and worked at a guidance counselor at Monroe Community College)
#6. Attended Rochester's East High(and Seton Hall Prep in NJ)/Seton Hall:
https://en.wikipedia.org/wiki/Walter_Dukes (Drafted in 1953 by the NY Knicks and is first Black NBA player from Upstate NY)
#7. Attended Syracuse's Vocational and later Corcoran High/New Mexico State:
https://en.wikipedia.org/wiki/Jimmy_Collins_(basketball)
https://www.syracuse.com/highschools...sketball-days/ (Was 11th pick in the NBA Draft in 1970 and is arguably the best Basketball player to come from the Syracuse area)
#8. Attended Syracuse's Henninger High/prep school at South Kent School in CT:
https://en.wikipedia.org/wiki/Andray_Blatche (was on team in 2002 that won the NYSPHSAA state championship in Class AA and that lost a close game to nationally ranked Harlem's Rice in the Federation final by 8 points)
#9. Attended Troy High/Xavier:
https://en.wikipedia.org/wiki/Luther_Rackley
https://goxavier.com/honors/hall-of-...her-rackley/75 (originally from Bainbridge GA, an area of that state where many black Upstate NYers have roots. Also played in a couple of movies)
#10. Attended Silver Creek High(Chautauqua County)/St. Bonaventure:
https://en.wikipedia.org/wiki/George_Carter_(basketball)
https://www.buffalosportshallfame.co...george-carter/ (was drafted by teams in 4 professional leagues in 1967)
#11. Attended Liberty High(Sullivan County)/St. Joseph's:
https://en.wikipedia.org/wiki/Maurice_Martin
https://theathletic.com/2024561/2020...eps-the-faith/ (last college game was played at the then Carrier Dome, in a lost to Cleveland state in the 1986 NCAA Tournament)
#12. Attended Shaker High(North Colonie SD in Latham and Brooklyn's Tilden High before that)/North Carolina:
https://en.wikipedia.org/wiki/Sam_Perkins (a McDonald's All American, he played with Michael Jordan at UNC(on the 1982 National Championship team) and played in the NBA from 1984-2001)
#13. Attended Niagara Falls High/Syracuse:
https://en.wikipedia.org/wiki/Jonny_Flynn (was the state's Mr. Basketball in 2007)
#14. Attended Notre Dame-Bishop Gibbons in Schenectady and Albany High/Xavier:
https://en.wikipedia.org/wiki/Lionel_Chalmers (cousin of Mario Chalmers(NBA Champ with Miami Heat)
#15. Attended Bishop Timon in Buffalo/New Mexico and Long Beach State:
https://en.wikipedia.org/wiki/Rickey_Williams
https://www.buffalosportshallfame.co...iams-brothers/ (his brother was the starting point guard on the 1975 Final Four team at Syracuse(attended Buffalo's East High)
#16. Attended Kendall High(Orleans County)/Syracuse:
https://en.wikipedia.org/wiki/Roosevelt_Bouie
Roosevelt Bouie (was a 2nd round pick of the Dallas Mavericks in the 1980 NBA draft, but ended up playing 14 seasons of pro ball in Italy)
#17. Attended Schenectady High and Hargrave Military Academy/Texas:
https://en.wikipedia.org/wiki/James_Thomas_(basketball) (won a NYSPHSAA state title in 1998 and started on the Texas team that lost to the Carmelo Anthony led Syracuse team in the 2003 Final Four)
#18. Attended Rochester's East High/Cincinnati:
https://en.wikipedia.org/wiki/Art_Long
https://basketball.realgm.com/player...g/Summary/1210 (tough big man known for his shot blocking ability, played for Bob Huggins at Cincinnati)
#19. Attended Buffalo's Bennett High/(a couple of community colleges)Hawaii:
https://en.wikipedia.org/wiki/Trevor_Ruffin
https://www.ebay.com/itm/1994-95-NBA...0136834?_ul=AR (a current coach at Health Sciences Charter in Buffalo, played with Charles Barkley in Phoenix and I believe his last college game was against Syracuse in the 1994 NCAA Tournament)
#20. Attended Buffalo's Traditional High(and Notre Dame Prep in MA)/Marquette:
https://en.wikipedia.org/wiki/Lazar_Hayward (ended college career at Marquette as the school's 2nd all time scorer and 5th all time in rebounds)
I'll stop here, but there are actually some others that have been drafted or even played a handful of games in the NBA. Let alone those that are in the NBA now, played overseas and that are in college right now, with a good chance to make an NBA roster in the upcoming years.
I may try to do a list with some ladies as well.