Of course, there are many, many more volunteer organizations, ranging from political, environmental, animal rescue and so forth.
Tree People: Caring for trees and nature in Los Angeles. The People Concern: Volunteer to serve meals to the homeless on the West Side. They show rescued animals on Main Street in Santa Monica every Sunday.
Much Love Animal Rescue: Guys, there are tons of women who volunteer for animal rescue organizations. 
Habitat for Humanity: Build houses for the poor. Orange County Sierra Singles: For singles in O.C. The Sierra Club Los Angeles: Volunteer to help the environment in Los Angeles. Heal the Bay: Has volunteer cleanup events. The goal is to beautify parts of the Compton community.
The Compton Initiative: This is a HUGE event that happens every few months. Hope for LA: Has a calendar where you can sign up for volunteer opportunities around L.A. Here are some organizations to volunteer with:
There are tons of great young single people who sacrifice their nights and even weekends to volunteer. It’s hard to think of a place where you’d meet a better type of person than at a volunteer event.