Nassau County is one of about 3,141 counties and county equivalents in the United States. It has 286.7 sq. miles in land area and a population density of 4,557.1 per square mile. In the last three decades of the 1900s its population declined by 6.6%. On the 2000 census form, 97.9% of the population reported only one race, with 10.1% of these reporting African-American. The population of this county is 10.0% Hispanic (of any race). The average household size is 2.93 persons compared to an average family size of 3.34 persons. In 2006 health care and social assistance was the largest of 20 major sectors. It had an average wage per job of $46,668. Per capita income grew by 25.4% between 1996 and 2006 (adjusted for inflation).

People & Income Overview (By Place of Residence)	Value	Rank in U.S.	Industry Overview (2006) (By Place of Work)	Value	Rank in U.S.
Population (2007)	1,306,533	27	Covered Employment	599,794	34
Growth (%) since 1990	1.4%	2137	Avg wage per job	$47,741	85
Households (2000)	447,387	32	Manufacturing - % all jobs in County	4.4%	2368
Labor Force (persons) (2007)	698,196	24	Avg wage per job	$54,096	269
Unemployment Rate (2007)	3.6	2392	Transportation & Warehousing - % all jobs in County	3.5%	885
Per Capita Personal Income (2006)	$62,278	17	Avg wage per job	$49,695	172
Median Household Income (2005)	$79,963	15	Health Care, Social Assist. - % all jobs in County	15.9%	316
Poverty Rate (2005)	5.4	3069	Avg wage per job	$46,668	66
H.S. Diploma or More - % of Adults 25+ (2000)	86.7	384	Finance and Insurance - % all jobs in County	6.2%	119
Bachelor's Deg. or More - % of Adults 25+ (2000)	35.4	109	Avg wage per job	$72,066	74