Are you looking for full time (morning to evening) daycare? If so, there is Children in the Shoe or Wonders in Bethesda. Other options include a couple of the Chevy Chase DC Montessori schools that have afternoon/evening care (Broad Branch Montessori or Montessori School of Chevy Chase).
If half-day preschool works, there are several very nearby: CCUMC (very popular among the MA crowd), CCBC, CCPC, Temple Sinai.
I consider all of the above to be great options as they are places I have considered sending my kids after a decent amount of research and touring. But there are certainly a number of others around that might work.