Look for local volunteer programs

Volunteering with a local non-profit will improve your relationship with the community. It's also easier to network and get good word-of-mouth marketing when you affiliate yourself with a local charity.

I recommend: Search for a local charity by zip code at 1-800-Volunteer.org. Local Independent Charities of America is a membership of 700 small charities; see if there's one near you. VolunteerMatch is the most comprehensive database of volunteering opportunities, with multiple search options. 

Get hooked up with a national or international volunteer organizations

If you're running your business at an enterprise-level, you might benefit more from having a relationship with one of the big non-profits. Besides holding fund raisers or volunteering locally, you can also get a team together to participate in runs/walks to raise money and awareness for various causes. Larger contributions usually means publicity for your company.

I recommend: Habitat for Humanity International, Make-a-Wish Foundation of America, United Way, the Salvation Army, the American Cancer Society and the American National Red Cross are all large non-profits that have corporate giving opportunities for you to contribute to, as well as local volunteer opportunities in most areas.

Take your team overseas and volunteer abroad

If your budget allows, overseas volunteering could be the best team building exercise your employees ever dreamed of.

I recommend: Search the database at VolunteerAbroad. If you know that you and your employees want to volunteer in Africa, go to UK-based VolunteerAfrica. Cross-Cultural Solutions offers the chance to take a "working vacation" for 1-12 weeks in more than 12 different countries.