- 1919: First Riverside County Council Summer Camp is held at Gray’s Meadow in Idyllwild. It is here that Claudius Lee Emerson reveals plan to donate land to the Boy Scouts.
- 1920: First Summer Camp held at the property that would become Camp Emerson. Riverside County Council organized in October under the leadership of C.J. Carlson, former Police Chief for the City of Riverside.
- 1921: C.J. Carlson reports that the Council has 46 Troops and over 800 Scouts enrolled.
- 1922: G. Albert Mills becomes Scout Executive, replacing C.J. Carlson, who becomes the Scout Executive of Long Beach Area Council and later Executive of Region 12. Mills would serve only 3 months before becoming the Riverside City Clerk. H.K. Merritt becomes Scout Executive. First Riverside County Council Pow Wow is held.
- 1926: C.B. Cantrell is hired as Scout Executive.
- 1928: Scout Executive C.B. Cantrell resigns. C.K. Radford is hired from Eureka as his replacement.
- 1929: Scout Executive Charles Knight Radford dies in a flight training accident. His flight student was injured but survived. John Leecing is hired as Scout Executive in his place.
- 1931: Council President and citrus industry magnate Fred Stebler is awarded the first Silver Beaver in council history.
- 1937: Carl M. Helmick hired as Scout Executive from the Yuma-Imperial Council, replacing John Leecing. Former Scout Executive C.J. Carlson is leading Region 12.
- 1972: Longtime Scout Executive Carl Helmick retires after 37 years as Scout Executive. John Dudley hired as new Scout Executive. Riverside County Council votes to merge with Arrowhead Area Council # 48, which formed California Inland Empire Council # 45 on January 1, 1973.
In 1954, a Wiyot Clan was formed in Corona, tied to the Temescal District. On June 14, they performed at a Court of Honor for the neighboring Laguna District.
- Arrowhead Area Council # 48
- Balboa Canal Zone Council
- California Inland Empire Council
- Grayback Council # 24 (1952 – 1974)
- Los Angeles Area Council
- Orange County Council
- Orange Empire Council
- Redlands Area Council
- Riverside County and Redlands Council # 45
- Riverside County Council
- San Diego County Council