American commuters prefer to go it alone—mostly by driving to the office, but increasingly by working from home.

Last year, about 76% of workers 16 years and older drove to work alone—just shy of the all-time peak of 77% in 2005, according to data from the Census Bureau's American Community Survey. Driving alone dipped slightly during the recession, but it has been ticking back up as the economy revives.

Meanwhile,...