If you want to see male and female red-winged blackbirds, go to a wetland where Typha angustifolia grow.
I often hear male and female red-winged blackbirds’ voice before I see them. You will understand what I mean by watching this 46-second video. I labeled ♂♀ in this video.
I couldn’t tell if this bird below is a female red winged blackbird or not. This was at Echo Lake Park, Shoreline.
But there is Typha angustifolia at the lake (see the image below). And I saw male red-winged blackbirds there! So I assume these two are female red-winged blackbirds!