Body shape does not seem to fit with Periphllus californiensis - can you check whether you have any maples neear by and whether there are nymphs that look like those at https://influentialpoints.com/Gallery/Periphyllus_californiensis_Californian_maple_aphid.htm#:~:text=Periphyllus%20californiensis%20apterae%20(see%20first,head%2C%20pronotum%2C%20and%20siphunculi.
I don't think there are any maple trees nearby although there could be some that i don't know about in people's gardens. I have a Liquidambar tree but as far as I can tell, while it looks similar, it is quite different. Looking at it again, this aphid does seem different to Periphyllus californiensis.