Of course, what we don't know in the above column graph is the average date of publication of print materials owned by public libraries.
Perhaps books aren't weeded as often in New England public library collections as they are elsewhere.
The overall average for Dane County is 3.3. Madison's collection of print materials comprises 42% of Dane County's total.
Institute of Museum and Library Services. "Public Libraries in the United States Survey, Fiscal Year 2011".
Wisconsin Department of Public Instruction. "Wisconsin Public Library Service Data". (2011)
Other public library statistics posts:
Number of public-use Internet computers: Selected Dane County public libraries vs. national average. (4/16/2014)
Two column graphs on public-use Internet computers in public libraries by population of legal service area (2011). (4/16/2014)
A statistical look at public-use Internet computers in public libraries, 2011. (4/15/2014)
Total, children's, and young adult public library program attendance per 1000 population, By population of legal service area (2011). (4/14/2014)
U.S. public library children's and young adult program attendance per 1000 population (top and bottom 10 States). (4/12/2014)
U.S. public library program attendance per 1000 population (top and bottom 10 states). (4/12/2014)
Wisconsin the unquestioned leader in interlibrary loans provided and received per 1000 population. (4/11/2014)
Wisconsin and Ohio share the public library interlibrary loan spotlight. (4/10/2014)
Public library visits and circulation per capita by population of legal service area (2011) . (4/8/2014)
Decline in Number of Bookmobiles Continues to Accelerate in 2011. (4/7/2014)
Library circulation per capita: Top 10 and bottom 10+ states. (4/5/2014)
Library visits per capita: Top 10 and bottom 10 states. (4/5/2014)
The biggest and the smallest U.S. public libraries: Hours of operation (2011). (4/3/2014)
Hours of operation. (4/3/2014)
Public Libraries: Larger and Smaller Units of Governance, Iowa and South Carolina. (4/1/2014)
Number of public libraries in the ten most populous states. (4/1/2014)
Percentage distribution of public libraries by legal service area population. (3/30/2014)
Public libraries by type of legal basis. (3/30/2014)
Public library revenue. (3/24/2014)
Number of libraries, 2011 (administrative units). (3/19/2014)
Library staffing, 2001-2011. (3/19/2014)