Morels grow in the spring in a wide variety of habitats throughout North America.
A roofer friend was at work in an affluent neighborhood in Queens, NYC, when he saw a troop of morels on his client's manicured lawn. He was so shocked, he almost fell off the roof. But he did bring the mushrooms home and enjoyed them thoroughly. People also find morels in woods, and along the edges of trails.
Old apple orchards, areas near dead elm trees, and regions with limestone in the soil are especially good places to look. Morels sometimes come up in the same place year after year.
Living just north of NYC, I find large quantities of a variety of mushrooms in our many parks, but morels are rare here, or I don't have the eye for them. We find them only rarely on my tours, and people who know where they grow don't give away the locations.