National Volunteer Month is dedicated to recognizing and honoring all the generous contributions volunteers make to worthy causes. Millions of nonprofits and charitable organizations rely on these volunteers who selflessly donate their time and talents.

Now it’s time to say thank you to all the volunteers who make a positive impact throughout the year. It’s also a time to encourage volunteerism to those who are able to help make a difference.

Here are 12 nonprofits who demonstrate how important the role their volunteers play in fulfilling their missions. We are truly inspired by these stories and hope you will be too!