1951- November 20th, Incorporation of SNOA.

1951-1966- SNOA only provided officials for baseball/softball, basketball, and football.

1966- Wrestling was added to SNOA.

1968- Soccer was added to SNOA.

1969- First Annual SNOA Banquet held, November 17th, 1969.

1972- Legal membership age for SNOA lowered from 21 to 18.

1972- SNOA elected officers became exempt from paying game fee assessment fee.

1973- First women basketball officials join SNOA.

1975- Volleyball was added to SNOA.

1976- Track and Field was added to SNOA.

1977- First two female football officials joined SNOA (Anna Adams + Denise Verret).

1977- Membership voted to separate the offices of SNOA Secretary and Treasurer for the first time, thus creating one additional seat on the Board of Directors. Both the secretary and treasurer positions were elected positions by the membership.

1978- SNOA conducted an association wide survey and the results yielded: 65% of its members were married, 50% were college graduates, the oldest active member was 71 and the average age of all officials was 34 years old.

1982- Due to CCSD budget cutbacks, freshman sports were eliminated for the 1982 school year.

1985- SNOA Soccer official John Kennedy is selected to officiate the NCAA Division 1 Soccer Championship game. Mr. Kennedy was also selected to officiate the 1986 NCAA Championship games as well. John. Kennedy was later inducted into the National Soccer Hall of Fame in 2009.

1990- Swimming was added to SNOA.

1991- Basketball official Mike Brooks is selected to officiate in the NCAA Women's Final Four, which was held in New Orleans, Louisiana.

1997- Former SNOA Basketball official Judy Peterson becomes the first female in SNOA to officiate a Boy’s 3A basketball game. (3A was the highest level in Nevada in 1997).

2000- Basketball official Bobby McRoy is selected to officiate in the Men's NCAA Basketball Tournament, the first ever Nevada basketball official to achieve that level. Mr. McRoy was also selected again in 2010.

2000- Former Softball Umpire Jim Lykins participates in the Sydney Olympic Games as an on-field softball umpire.

2003- 2nd Vice-President was added to the SNOA Board of Control.

2006- SNOA Member Marc Perlman is selected to officiate Super Bowl XL. Mr. Perlman was also selected to officiate Super Bowl XLIII in 2009, and Super Bowl XLIX in 2015 as well.

2008- SNOA Member Joe Burleson participates in the Beijing Olympic Games as an on- field baseball umpire.

2010- Tre Maddox becomes the first ever basketball official from SNOA to officiate a regular season NBA basketball game.

2010- SNOA Member Kelly Gonzales is selected to umpire in the NCAA College World Series.

2012- Girls High School Flag Football is played as a sport full-fledged sport within the Clark County School District and is officiated with SNOA Football Officials.

2016- SNOA Member Darryl Johnson officiates the College Football National Championship game between the Alabama Crimson Tide vs. the Clemson Tigers, which was held in Glendale, Arizona. Darryl Johnson also officiated the 2018 National Championship game between Alabama and Clemson in New Orleans, Louisiana.

2016- SNOA Member Joe Burleson is the home plate umpire for the NCAA National Championship Baseball Game between Coastal Carolina and the University of Arizona. This was the 5th time that Joe Burleson has been selected to umpire in the College World Series.

2021- SNOA Commissioner of Officials, Marc Ratner, is inducted into UFC Hall of Fame. Marc Ratner is also part of the Nevada Boxing Hall of Fame (2012) and the International Boxing Hall of Fame (2016).

2023- SNOA Baseball Umpire Ben Sprague is the home plate umpire for the championship game of the Little League World Series in Williamsport, PA.

2024- NFL Football official Mark Perlman officiated Super Bowl 58 held in Las Vegas at Allegiant Stadium. This was Mark Perlman's 4th Super Bowl officiated.

2024- Basketball official In'Fini Robinson is selected to work the 2024 NCAA Women's Final Four held in Cleveland, Ohio. In'Fini Robinson is the first ever female basketball official from SNOA to officiate in the NCAA Tournament.