St. Johns County, Florida
St. Johns County
St. Johns County Courthouse
Location within the U.S. state of Florida
Florida's location within the U.S.
|Founded||July 21, 1821|
|Named for||San Juan del Puerto|
|Largest city||St. Augustine|
|• Total||822 sq mi (2,130 km2)|
|• Land||601 sq mi (1,560 km2)|
|• Water||221 sq mi (570 km2) 26.9%%|
| • Estimate |
|• Density||440/sq mi (170/km2)|
|Time zone||UTC−5 ( Eastern)|
|• Summer ( DST)||UTC−4 ( EDT)|
|Congressional districts||4th, 6th|
St. Johns County is a county located in the northeastern part of the U.S. state of Florida. As of the 2010 United States Census, the county's population was 190,039, with a 2018 estimate of 254,261.  The county seat and largest incorporated city is St. Augustine.  St. Johns County is part of the Jacksonville metropolitan area.
The county was established in 1821. It is one of the two original counties established after Florida was ceded to the United States, at the start of the Florida Territorial period, and corresponded roughly with the former colonial province of East Florida. It was named for the St. Johns River, which runs along its western border.
Today, St. Johns County is primarily made up of residential bedroom communities for those who commute to Jacksonville. Tourism, primarily associated with St. Augustine and the many golf courses in the area, is the chief economic industry.
There is also an unincorporated community named Saint Johns in northwestern St. Johns county.
St. Johns County's history begins in 1821, when Colonel Robert Butler received Spanish East Florida from Captain-General Colonel José M. Coppinger. Butler represented Major General Andrew Jackson, federal military commissioner for the Florida provinces (las Floridas) with the powers of governor, exercising the powers of the Captain General and the Intendants of the Island of Cuba and the Governors of the said provinces, respectively, who ordained that all of that country lying east of the river Suwannee  should be designated as the County of St. Johns.
St. Johns was established, along with Escambia County (in the former West Florida province), on July 21, 1821, just eleven days after Butler received Florida for the United States, and only five days from the date that the city of St. Augustine was incorporated.
The name Saint John's was derived from the Spanish mission (c. 1580) San Juan del Puerto or Saint John of the Harbor. The apostrophe was dropped in 1932 by the U.S. Department of the Interior because an apostrophe implied ownership.
It was a huge county, encompassing most of peninsular Florida, or more than 39,000 square miles; it was 475 miles long by 165 miles wide. Much of the land was uninhabited. Saint Augustine (1565) was the oldest permanent European settlement, and there were Native Americans in the county as well. 
- Duval County, Florida – north
- Flagler County, Florida – south
- Putnam County, Florida – southwest
- Clay County, Florida – west
- Castillo de San Marcos National Monument
- Fort Matanzas National Monument
- Guana Tolomato Matanzas National Estuarine Research Reserve
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2015  2019 
As of the census  of 2000, there were 123,135 people, 49,614 households, and 34,084 families residing in the county. The population density was 202 people per square mile (78/km²). There were 58,008 housing units at an average density of 95 per square mile (37/km²). The racial makeup of the county was 90.92% White, 6.29% African American, 0.26% American Indian, 0.95% Asian, 0.05% Pacific Islander, 0.55% from other races, and 0.97% from two or more races. Hispanic or Latino of any race were 14.8% of the population. There is a Jewish community. 
There were 49,614 households out of which 29.20% had children under the age of 18 living with them, 56.80% were married couples living together, 8.90% had a female householder with no husband present, and 31.30% were non-families. 24.30% of all households were made up of individuals and 9.40% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.90.
The age of the population was spread out with 23.10% under the age of 18, 7.00% from 18 to 24, 27.60% from 25 to 44, 26.40% from 45 to 64, and 15.90% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 94.50 males. For every 100 females age 18 and over, there were 91.50 males.
The median income for a household in the county was $50,099, and the median income for a family was $59,153. Males had a median income of $40,783 versus $27,240 for females. The per capita income for the county was $28,674. About 5.10% of families and 8.00% of the population were below the poverty line, including 9.30% of those under age 18 and 6.20% of those age 65 or over.
The St. Johns County Board of County Commissioners is an elected five-member commission, which appoints a county administrator. The main environmental and agricultural body is the St. Johns County Soil and Water Conservation District, which works closely with other area agencies. In 2016 Donald Trump received 88,684 votes (64.34%) while Hillary Clinton received 43,099 votes (31.27%).
Voter Registration Statistics as of 2/24/19
St. Johns County Animal Control operates the St. Johns County Pet Adoption and Holding Center at 130 North Stratton Road.
Public schools are run by the St. Johns County School District, headed by the St. Johns County School Board, an elected five-member board which appoints a superintendent to administer schools' operations. The system has grown considerably since 2000 to accommodate the county's rapid population growth. It is Florida's top performing school district in Florida Comprehensive Assessment Test scores, the state's standardized test for public schools.  In addition, the district received 2011 Energy Star Top Performer and Leader from the EPA 
For the 2014–2015 school year the district comprised:
- 18 elementary schools (K–5)
- 3 K-8 school (K–8)
- 7 middle schools (6–8)
- 7 high schools (9–12)
- 1 alternative center (K-12)
- 6 charter schools (including a vocational-technical college)
- 1 virtual school
The St. Johns County School District has a robust special education department serving the needs of students with autism, cerebral palsy, and cognitive disabilities. Additionally, the Florida School for the Deaf and Blind is a residential school for deaf and blind students, funded and operated by the state of Florida.  The Catholic Diocese of St. Augustine operates St. Joseph Academy, a private high school in St. Augustine.
St. Johns River State College, a state college in the Florida College System, has a campus in St. Johns County near St. Augustine. It is accredited by the Southern Association of Colleges and Schools to award associates degrees and two bachelor's degrees.
The St. Johns County Public Library has six branches:
- Anastasia Island Branch
- Bartram Trail Branch
- Hastings Branch
- Main Library
- Ponte Vedra Beach Branch
- Southeast Branch
- Research Library
- Northeast Florida Regional Airport
- Jacksonville International Airport (JAX) is approximately 35 miles to the north (located in Duval County).
- National Register of Historic Places listings in St. Johns County, Florida
- Parks in St. Augustine/St. Johns County, Florida
- St. Johns River
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