Ok, lots of completely non-helpful answers. This is only semi-non helpful since I don't have a specific church to offer, but I'd start with the church websites near you. Usually there's a page with a list of the types of groups that meet. Prayer groups, social groups, that kind of thing. See if any of them strike you as being for singles or coed bible studies or even community service.
Here's an example from the National Cathedral.
https://cathedral.org/congregation/ministries-outreach/
This may skew a bit young since it's 20s-30s, but at Holy Trinity in Georgetown.
https://trinity.org/young-adults/
I attend a Catholic parish in Virginia that unfortunately doesn't have what you are seeking. Our parish is a mix of families and senior citizens.
Good luck.