Where are the hummingbirds?
My yard is a magnet for hummingbirds. In previous years, hummingbirds would be here (Montgomery County) in full force. My honeysuckle started thriving at least a month ago as well as other plants which attract hummingbirds. Has there been some weather event that has impacted their migration?
Hummingbirds showed up in Maryland at least a couple of weeks ago, so they are here somewhere. You might try contacting your local bird stores to inquire what people are seeing in your area. Or your local Audubon chapters.
And, of course, put out feeders to supplement your supply of nectar plants. Your neighbors may not have enough food sources for them, even if your property is well-stocked.