I know that some local deliveries (of milk and ice, especially) were still made with horse-drawn vehicles long after cars and trucks had taken over elsewhere, but check out this photo from 1920 …

I’m guessing this was an advertising or publicity photo for Smith’s Transfer and Storage Co. (in Washington, DC). At the front of the procession is a moving van hitched to three horses. Behind them are four different sizes and shapes of motorized vehicles, and then four more horse-drawn vans.