Even the most modern or eco-friendly sippy cups are likely made outside the US, but one unassuming brand is made here.
Gerber Graduates Fun Grips Soft Spout Trainer Cup in Assorted Colors, 7-Ounce (pack of 2)
With handles, these sippy cups were an easy transition from bottles for us, since the spouts are easy on gums. They’re also BPA-free and dishwasher safe.