Firefighters, police officers, ambulance drivers, garbage collectors, mail carriers, crossing guards public-school teachers, school-grounds and maintenance workers, public librarians, bus drivers, and parks and recreation workers are just a few of the city-service people that make a town or city run well. Every day, these and hundreds of other workers labor to make communities across the United States safe, clean, and healthy. Many of these workers are paid for their jobs, but many also volunteer (work without pay) to help their neighborhoods be safe. The government estimates that about 60 million people volunteer each year, most often in religious, educational, youth, or community service organizations. Volunteers commonly perform activities such as firefighting, coaching, campaigning, fundraising, delivering goods, and serving on boards or neighborhood associations.