Here's some info from the City of Austin's Transportation Department regarding the percentage of Austinites who bike to work.
City of Austin Transportation Department
Bike Commuting Hits 10% In Some Areas
Red equals higher percentages of bike commuters in Austin.
The percentage of people who commute to work on a bike has reached double digits in some central Austin neighborhoods.
In the 2012 State of Bicycling address, the Public Works Department reported the city had met a major milestone in bicycle transportation, that 2 percent of Austin's workforce is commuting by bike.
Now Bicycle & Urban Trails Program Manager Annick Beaudet has parsed the data by geographic location, and the results show that in some neighborhoods almost 1 in 10 residents are commuting by bike.
City Council set overall bicycle commuting goals for the city at 2 percent by 2015 and 5 percent by 2020, with a secondary goal was also set for the central city at 8 percent by 2015 and 10 percent by 2020.
Currently, the total central city mode share averages at about 6 percent.
The first three months of 2013 have seen five important bicycle construction projects reach completion or make steady progress: the Lance Armstrong Bikeway Downtown Section (3rd Street), the Southern and Northern Walnut Creek Trails, the Austin to Manor Trail Phase I, and the Barton Springs Road Cycle Track/Bicycle Lane Improvement Project.
These projects, which are funded with a combination of federal grant funds and local bond funds totaling approximately $17 million, will create about 13 lane miles of high-quality physically-separated bicycle facilities.
In 2012, the Public Works Department completed 40 miles of bicycle projects. This work included building 23.5 miles of new bicycle lanes, widening 10 miles of existing bicycle lanes, and installing 1.3 miles of separated bike lanes).
Upcoming improvements are planned for St Johns Avenue (from Berkman to Lamar), Burnet Road (from Koenig to Research), South Lamar Boulevard (from Cinco to Mary), and others.
http://www.austin-mobility.com/