St. Johns County is one of about 3,141 counties and county equivalents in the United States. It has 609.0 sq. miles in land area and a population density of 298.1 per square mile. In the last three decades of the 1900s its population grew by 296.8%. On the 2000 census form, 99.0% of the population reported only one race, with 6.3% of these reporting African-American. The population of this county is 2.6% Hispanic (of any race). The average household size is 2.44 persons compared to an average family size of 2.90 persons. In 2007 accommodation and food services was the largest of 20 major sectors. It had an average wage per job of $17,562. Per capita income grew by 23.0% 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)	181,540	334	Covered Employment	56,874	424
Growth (%) since 1990	116.6%	45	Avg wage per job	$35,536	685
Households (2000)	49,614	410	Manufacturing - % all jobs in County	5.2%	2254
Labor Force (persons) (2008)	93,621	327	Avg wage per job	$50,726	418
Unemployment Rate (2008)	5.1	1828	Transportation & Warehousing - % all jobs in County	1.5%	1952
Per Capita Personal Income (2007)	$50,179	80	Avg wage per job	$40,548	992
Median Household Income (2007)	$63,728	157	Health Care, Social Assist. - % all jobs in County	10.2%	1149
Poverty Rate (2007)	6.7	3002	Avg wage per job	$37,173	590
H.S. Diploma or More - % of Adults 25+ (2000)	87.2	339	Finance and Insurance - % all jobs in County	2.8%	1175
Bachelor's Deg. or More - % of Adults 25+ (2000)	33.1	146	Avg wage per job	$74,873	78