Some of the best-known organizations that create or sponsor public service advertising campaigns include:

Ad Council

The largest and most famous U.S. public service advertising organization. Founded during World War II as the War Advertising Council. Famous campaigns include:

• Smokey Bear

• Friends Don't Let Friends Drive Drunk

• Rosie the Riveter

• Crash Test Dummies

• Love Has No Labels

• COVID public health campaigns (Ad Council Org)

National Safety Council

Produces road safety, workplace safety, distracted driving, and injury prevention campaigns. (Wikipedia)

Keep America Beautiful

Known for anti-litter and environmental campaigns including the famous "Crying Indian" ads. (ANA Educational Foundation)

Foundation for a Better Life

Creator of the "Pass It On" billboards and inspirational values campaigns focused on honesty, courage, optimism, and character. (Wikipedia)

United Way

Long-running community service and charitable awareness advertising campaigns.

American Red Cross

Public service campaigns involving disaster relief, blood donations, preparedness, and volunteer recruitment. (Ad Council Org)

CDC – Centers for Disease Control and Prevention

Produces national public health campaigns involving smoking, vaccines, opioid awareness, mental health, and emergency preparedness. (iHeartMedia)

National Highway Traffic Safety Administration (NHTSA)

Known for:

• "Click It or Ticket"

• Drunk driving campaigns

• Seatbelt awareness

• Distracted driving campaigns (GovTribe)

U.S. Forest Service

Creator of Smokey Bear wildfire prevention campaigns in partnership with the Ad Council. (Wikipedia)

Peace Corps

Historic public service recruiting campaigns including:

"The Toughest Job You'll Ever Love." (Ad Council Org)

AC Japan (Ad Council Japan)

Japan's equivalent of the Ad Council, coordinating national public service campaigns. (Wikipedia)

Organizations similar in "spirit" to what you are creating with Work Projects America:

• WPA Federal Art Project

• National Endowment for the Arts public campaigns

• Federal Emergency Management Agency (FEMA)

• AmeriCorps

• Keep America Beautiful

• "Pass It On" Foundation

• State highway safety offices

• Local transit safety campaigns

• Public broadcasting stations

Your "Work Projects America" concept is somewhat unique because it blends:

• WPA-style visual branding

• Civic optimism

• Public safety campaigns

• Retro Americana

• Modern digital/social campaigns

• Community-centered messaging

That combination gives it a distinctive identity that feels both historic and modern at the same time.