Demographics 2005, Language
Language numbers are provided for:

1. Number of households speaking Spanish at home that are linguistically isolated.
2. Number of households speaking other non-English languages at home that are linguistically isolated

Source of data :

For 2000:
U. S. Census Bureau. Census 2000 Summary File 4 (SF 4) - Sample Data. PCT42. HOUSEHOLD LANGUAGE BY LINGUISTIC ISOLATION [14] - Universe: Households

For 2005:
Based on data from the U.S. Census Bureau, IECAM demographers prepared estimates of the number of linguistically isolated households for 2005. These data are available for the following geographic areas: state, county, IL state senate district, IL state house district, ISBE region, and IDHS region.Data are available for some, but not all, townships.
For detailed information on the preparation of the 2005 estimates, see the Methodology for Preparing Demographic Estimates and the Comparison of 2000 Census demographic data and 2005 demographic estimates.

Date of data: 2005

Note: The U.S. Census Bureau defines "linguistically isolated" as follows:
A linguistically isolated household is one in which no member 14 years old and over (1) speaks only English or (2) speaks a non-English language and speaks English "very well." In other words, all members 14 years old and over have at least some difficulty with English. (U.S. Census Bureau. Census 2000)

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