Goldfinch or Pine Siskin?

Smaller than a sparrow.

You have several American Goldfinches still in their winter clothes. The Pine Siskins would be browner and have streaking on the front, with only a hint of yellow in the wing feathers. Also you have an American Tree Sparrow in the upper right of the second picture.

Awesome! Thank you! Nice to put a name to that Sparrow too :) I have an awful time with Sparrows, even with a birding book they almost all look alike....

You're welcome. :)

I used to say all Sparrows look alike, so I wasn't going to bother. Well, they turned out being the species I have the easiest time identifying (for the most part). Some of that is because we have so many that consistently come to our property and feeding area that I can practice more often. Gulls and sandpipers on the others hand...

I looked again and still see American Tree. Look at the rusty patch further back from the eye. A Chipping's would be black.
https://www.allaboutbirds.org/guide/spp_photos.aspx?ss=2&sppid=151&keepThis=true&TB_iframe=true&height=488&width=875

It is possible, but not common to have Chippings in Ontario quite yet. I've seen no reports in Iowa of them so far this year. Also, I think I see the hint of that black spot on the breast.

We had about 2 dozen Sparrows, a couple different kinds, overwinter here. Maybe because we feed them twice a day? So if they aren't supposed to be back yet, maybe they didn't leave?

Any more pics of this bird?

Resin

I scrolled through the shots I took that day and could only find one of his behind....I have other shots of Sparrows taken all winter but this is the only one I can say for certain is the same bird.

It seems I cannot convince Resin it's American Tree. That's ok. :)

Threegardeners, if you see a bird with a bill that has black/gray on top and yellow on the bottom, rusty shoulders, rusty colored line from the eye, that is an American Tree Sparrow. Lighting and individual variations of the bird can make them look quite different, but those are the markings I rely on. Also the spot on the breast for the most part, but I have seen a few Tree Sparrows without this or it is very faint.

I posted a picture from some years ago that show the different markings.

Rarely are Chipping Sparrows in Iowa for the winter, but on occasion it happens. It is doubtful we would see them in our yard in the winter because our habitat is very open. They are usually gone by mid-November. Here are the range maps for these two birds to see what is "normal". Birds don't know they are supposed to follow these, so at times there are oddities.
https://www.allaboutbirds.org/guide/Chipping_Sparrow/id
https://www.allaboutbirds.org/guide/American_Tree_Sparrow/id