Company Names, addresses, dates:
  Oak Crest Dairy, Falls Church, VA

Notes:
The proprietors were J. & L. Clarke. I couldn't find any information about them.
The earliest reference to this dairy that I found was in the Washington Evening Star newspaper, Dec 16, 1921, on page 45. It was a want-ad for a farm & dairy hand, Oak Crest Farm in Falls Church VA, with phone number 120-F-22. I see similar ads as late as March 1924.

The bottle below does not have a city name on it, so I can't be certain it was from the same Oak Crest dairy that was in Falls Church VA.

Bottles

This is a 7.25" clear bottle embossed: neck: (empty circle on front & back) above slug plate: ONE PINT / LIQUID round slug plate: J. & L. CLARKE / OAK CREST / DAIRY (there is no city embossed on this bottle, so I can't be certain it was from Falls Church VA)