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 288.1 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 $17,558. Per capita income grew by 28.9% between 1996 and 2006 (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 (2007)	175,446	340	Covered Employment	56,814	424
Growth (%) since 1990	109.3%	48	Avg wage per job	$35,535	681
Households (2000)	49,614	410	Manufacturing - % all jobs in County	5.2%	2255
Labor Force (persons) (2007)	89,843	342	Avg wage per job	$50,722	417
Unemployment Rate (2007)	3.3	2605	Transportation & Warehousing - % all jobs in County	1.5%	1952
Per Capita Personal Income (2006)	$48,283	71	Avg wage per job	$40,560	990
Median Household Income (2005)	$57,277	181	Health Care, Social Assist. - % all jobs in County	10.2%	1152
Poverty Rate (2005)	7.5	2906	Avg wage per job	$37,233	586
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	$74,886	78