Within the Association of Junior Leagues International (AJLI), there are a number of independently organized League groups. The Junior League of Napa-Sonoma is part of AJLI's NorCal RenoHon region comprised of member organizations in Northern California, Nevada and Hawaii. League leaders from the region meet four times a year to collaborate on training, planning and brainstorming.

NorCalRenoHon's member Leagues are:

Fresno, CA
Honolulu, HI
Monterey County, CA
Napa-Sonoma, CA
Oakland-East Bay, CA
Palo Alto - Mid Peninsula, CA
Reno, NV
Sacramento, CA
San Francisco, CA
San Jose, CA