Meetup counts over 100,000 members of 166 civic hacking meetups around the world. The groups included here vary in how technical they are, but you can always count on meeting people and contributing to projects, regardless of whether or not you can code.
It is a collective of people using their skills to create things for the public good. Sometimes this involves tech, sometimes community organising, sometimes it's just talking about and understanding a problem from different points of view.
The Code for America Brigade Network is a national alliance of community organizers, developers, and designers that are putting technology to work in service of our local communities.