Anaheims are a common sub for poblanos. Depends what the recipe is.
If it's for stuffing, you can even use some bell peppers or cubanelle peppers. If it's an ingredient in something, use a small jalapeno (stripped of ribs and seeds).
Among the chiles commonly available in U.S. supermarkets, Anaheim or New Mexico are probably the best substitutes. A mild jalapeno would probably work, too, though you might want to start out using less of that than the recipe calls for, and increase to taste.
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If it's for stuffing, you can even use some bell peppers or cubanelle peppers. If it's an ingredient in something, use a small jalapeno (stripped of ribs and seeds).