The 2011 census numbers are in and Minneapolis is reported to have a 3.3 percent bicycle mode share.
To compare: Portland has 6.3, Seattle has 3.5, and San Francisco has 3.4.
While they are the best we've got, the numbers aren't perfect. For example, about 1.1% of Minneapolis residents supposedly traveled to work on streetcars, elevated trains, subways, and rail cars.
