Index change and building permits for the year, with every county.
In 2008 the FHFA house price index for Illinois changed −3.0%, against −4.5% for the United States and +1.3% in 2007.
22,528 housing units were authorised by building permits in the state that year (11,827 single-family), −47.6% on 2007; the national total was 905,359.
−3.0%Illinois index, 2007–2008US −4.5%
22,528housing units permitted in 200811,827 single-family
48 of 93counties with a rising indexmedian county +0.1%
Ranked by the county index change from 2007 to 2008 (FHFA annual county index). Permits are units authorised in 2008; per 1,000 uses the vintage 2025 population.
Housing units authorised in Illinois by yearsingle-family2+ unit buildings
Source: Federal Housing Finance Agency annual state and county house price indexes (updated March 31, 2026); Census Bureau Building Permits Survey annual state and county files. Public domain. Methodology.