The cold water in my kitchen, only, has low pressure. This includes both the sink and the refrigerator dispenser. The bathroom and outdoor cold water faucets are fine. What could be my problem?

Do you have any kind of water filtration system installed under the sink ?

There are no water filtration systems under the kitchen sink!

Usually, icemaker line is tapped-in somewhere under your kitchen sink. When you look under your sink, do you see 1/4" icemaker line ?

I am asking you these questions bcs I am trying to determine if your kitchen cold water line and icemaker have same supply...

No -- they are not directly connected. Both the refrigerator and the Kitchen sink's cold water have their own direct water lines.