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 4,714.4 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 2007 health care and social assistance was the largest of 20 major sectors. It had an average wage per job of $47,672. Per capita income grew by 18.6% between 1997 and 2007 (adjusted for inflation).

People & Income Overview (By Place of Residence)	Value	Rank in U.S.	Industry Overview (2007) (By Place of Work)	Value	Rank in U.S.
Population (2008)	1,351,625	27	Covered Employment	604,184	34
Growth (%) since 1990	5.0%	1897	Avg wage per job	$50,433	77
Households (2000)	447,387	32	Manufacturing - % all jobs in County	4.1%	2393
Labor Force (persons) (2008)	701,491	24	Avg wage per job	$57,482	242
Unemployment Rate (2008)	4.7	2065	Transportation & Warehousing - % all jobs in County	3.5%	877
Per Capita Personal Income (2007)	$62,981	21	Avg wage per job	$49,015	260
Median Household Income (2007)	$89,360	12	Health Care, Social Assist. - % all jobs in County	16.5%	276
Poverty Rate (2007)	4.7	3112	Avg wage per job	$47,672	91
H.S. Diploma or More - % of Adults 25+ (2000)	86.7	384	Finance and Insurance - % all jobs in County	5.9%	134
Bachelor's Deg. or More - % of Adults 25+ (2000)	35.4	109	Avg wage per job	$78,560	66