Certified Wildlife Habitat
Is there any other organization that will provide signage or certify a garden as a "Wildlife Habitat"? besides the National Wildlife Federation
There are other programs similar in scope, all encouraging environmental stewardship. Sometimes there is a small fee for the signage.
One is called the Baywise Program, which is facilitated by Maryland/County Master Gardeners. More on that here: https://extension.umd.edu/baywise/program-certification
This page from Maryland's Wild Acres program is a great resource itself and also lists additional programs: