CPB Audience Service Criteria
NPR Illinois exceeds the Corporation for Public Broadcasting's (CPB) Audience Service Criteria for both the Listening Index (LI) and the Community Financial Support Index (CFSI). The indices are tied to a grantee's Coverage Area Population (CAP).
NPR Illinois falls into the CPB 500,000 - 1 million tier CAP goals:

Calculation shown below:
NPR Illinois Listening Index
22 LI = (1,100 AQH x 10,000)/501,240 CAP
NPR Illinois Community Financial Support Index
127 CFSI = ($638,113 CFS x 100)/501,240 CAP
AQH (M-Su, 24 Hr) based on Radio Research Consortium (RRC) Nielsen Audio data from Spring 2014 and Spring 2015 surveys.
CAP based on Census data of Nielsen Audio measured counties as reported through RRC:

Annual Estimates of the Resident Population: April 1, 2010 to July 1, 2014
Source: U.S. Census Bureau, Population Division
Release Dates: For the United States, regions, divisions, states, and Puerto Rico Commonwealth, December 2014. For counties, municipios, metropolitan statistical areas, micropolitan statistical areas, metropolitan divisions, and combined statistical areas, March 2015. For Cities and Towns (Incorporated Places and Minor Civil Divisions), May 2015.