| As of the census[2] of 2000, there were 644,356
people, 216,297 households, and 163,953 families residing in the
county. The population density was 1,440 people per square mile
(556/km²). There were 225,919 housing units at an average density
of 505 per square mile (195/km²). The racial makeup of the
county was 80.11% White, 6.94% Black or African American, 0.28%
Native American, 3.90% Asian, 0.05% Pacific Islander, 6.72% from
other races, and 2.01% from two or more races. 14.39% of the population
were Hispanic or Latino of any race. 17.0% were of German, 9.0%
Irish, 7.2% Polish, 6.4% Italian and 5.0% American ancestry according
to Census 2000. 78.7% spoke English, 12.9% Spanish and 1.0% Russian
as their first language.
The Census estimates of 2005 showed Lake County with 68.6% of its
residents being non-Hispanic whites, 18.2% Latinos, 6.8% African
American and 5.5% Asian.[3]
Historical populations
Census Pop. %±
1840 2,634 —
1850 14,226 440.1%
1860 18,257 28.3%
1870 21,014 15.1%
1880 21,296 1.3%
1890 24,235 13.8%
1900 34,504 42.4%
1910 55,058 59.6%
1920 74,285 34.9%
1930 104,387 40.5%
1940 121,094 16.0%
1950 179,097 47.9%
1960 293,656 64.0%
1970 382,638 30.3%
1980 440,372 15.1%
1990 516,418 17.3%
2000 644,356 24.8%
Est. 2008 712,453 10.6%
According to the 2000 census there were 216,297 households out of
which 42.10% had children under the age of 18 living with them,
63.20% were married couples living together, 9.20% had a female
householder with no husband present, and 24.20% were non-families.
19.70% of all households were made up of individuals and 6.20% had
someone living alone who was 65 years of age or older. The average
household size was 2.88 and the average family size was 3.33.
In the county the population was spread out with 29.40% under the
age of 18, 8.90% from 18 to 24, 31.60% from 25 to 44, 21.60% from
45 to 64, and 8.50% who were 65 years of age or older. The median
age was 34 years. For every 100 females there were 101.20 males.
For every 100 females age 18 and over, there were 99.30 males. Waukegan
and North Chicago account for 20% of the county's population.
The median income for a household in the county was $66,973, and
the median income for a family was $76,424 (these figures had risen
to $76,940 and $88,851 respectively as of a 2007 estimate[4]). Males
had a median income of $50,789 versus $33,458 for females. The per
capita income for the county was $32,102. About 4.00% of families
and 5.70% of the population were below the poverty line, including
7.00% of those under age 18 and 4.80% of those age 65 or over. The
2000 Census reported that Lake County had the second median highest
household income of any county in the state, behind DuPage County.
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