• county
  • FIPS 12109
  • Largest town: St. Augustine

St. Johns County, Florida

St. Johns County had 334,928 residents in the Census Vintage 2024 estimate, on 600.7 square miles of land. It ranks 21st of 67 in Florida by population and 44th by land area.

Population
334,928
#21 of 67 in Florida · #222 in US
Area
600.7 sq mi
#44 of 67 in Florida · #1,623 in US
Density
558 / sq mi
#15 of 67 in Florida · #258 in US
Median household income
$106,281
#1 of 67 in Florida · #84 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

St. Johns County within Florida. Pin: Tallahassee.

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Tools and pages that start from St. Johns County

St. Johns County population, land area and income

St. Johns County had 334,928 residents in the Census Vintage 2024 estimate, on 600.7 square miles of land. It ranks 21st of 67 in Florida by population and 44th by land area. That works out to 557.6 people per square mile, 5.8 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Florida has 154,693 residents, so St. Johns County is 2.2 times that size.

Its SAIPE 2023 median household income of $106,281 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

334,928

3144th1st

222nd of 3,144 (US)

Land area

601 sq mi

3144th1st

1623rd of 3,144 (US)

Density

557.6 / sq mi

3144th1st

258th of 3,144 (US)

Median household income

$106,281

3143rd1st

84th of 3,143 (US)

Rank within Florida (67)

Population

334,928

67th1st

21st of 67 (FL)

Land area

601 sq mi

67th1st

44th of 67 (FL)

Density

557.6 / sq mi

67th1st

15th of 67 (FL)

Median household income

$106,281

67th1st

1st of 67 (FL)

How St. Johns County's population changed since 2020

St. Johns County gained 57,823 residents between the July 2020 and July 2024 estimates, a rise of 20.9%. That ranks 1st of 67 in Florida for growth. The median Florida county changed by +7.8%, and the state as a whole by +8.2%.

Since the April 2020 estimates base, St. Johns County recorded 10,093 births and 11,002 deaths, a natural change of -909. Net international migration added +4,951 and net domestic migration, people moving to or from other US counties, came to +58,140. The largest single component was domestic migration, which added 58,140 people.

277.1k2020293.3k2021307.8k2022321.5k2023334.9k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
10,093
Deaths
11,002
Net international migration
+4,951
Net domestic migration
+58,140
Change, July 2023 to July 2024
+13,418

Where St. Johns County is

The Census internal point of St. Johns County is at 29.890500, -81.400000. It sits in UTM zone 17N. The map shades Florida's 67 county-equivalents by population change from 2020 to 2024, darker for faster growth, with St. Johns County outlined. Dots are towns of 1,000+ people with residents in it.

Escambia County: +2.7%Okaloosa County: +4.0%St. Lucie County: +17.9%Okeechobee County: +6.8%DeSoto County: +7.8%Bradford County: -0.5%Bay County: +14.4%Holmes County: +1.6%Gilchrist County: +13.1%Manatee County: +14.1%Hardee County: +2.9%Lafayette County: +5.0%Flagler County: +17.9%Nassau County: +14.7%Pasco County: +16.4%Martin County: +4.4%Palm Beach County: +5.9%Alachua County: +4.3%Lee County: +12.5%Brevard County: +8.2%Polk County: +16.8%Pinellas County: +0.6%Highlands County: +8.3%Hamilton County: +4.4%Wakulla County: +9.5%Clay County: +8.1%Suwannee County: +9.2%Madison County: +2.9%Columbia County: +6.0%Jackson County: +6.1%Calhoun County: -3.1%Franklin County: +4.0%Gulf County: +11.3%Hernando County: +11.5%Washington County: +4.7%Levy County: +10.9%Liberty County: +1.9%Putnam County: +5.3%Volusia County: +8.5%Walton County: +18.2%Osceola County: +19.7%Leon County: +2.2%Union County: +2.0%Sarasota County: +9.2%Dixie County: +5.6%Charlotte County: +12.8%Indian River County: +7.3%Broward County: +4.8%Hendry County: +16.1%Sumter County: +18.7%Miami-Dade County: +5.3%Citrus County: +10.1%Seminole County: +4.9%Lake County: +15.0%Marion County: +13.6%St. Johns County: +20.9%Gadsden County: +1.7%Jefferson County: +10.5%Baker County: +4.3%Glades County: +8.7%Collier County: +10.3%Duval County: +5.7%Taylor County: +0.4%Monroe County: -2.3%Hillsborough County: +7.8%Santa Rosa County: +9.9%Orange County: +7.1%
Change 2020 to 2024
  1. < +4.0%
  2. < +5.7%
  3. < +8.7%
  4. < +13.1%
  5. ≥ +13.1%
no data

Orange pin: St. Johns County internal point. Dark pin: Tallahassee.

Internal point

Decimal
29.890500, -81.400000
DMS
29°53'25.80"N 81°24'0.00"W
UTM
17N 461378.5E 3306719.2N
Geohash
djq459qkf
Plus code
76XWVJR2+62

Towns in St. Johns County

2 incorporated places of 1,000+ people have residents in St. Johns County, 22,841 people together, or 7% of the county. Each figure counts only the part of the town inside St. Johns County; towns marked "part" extend into another county. The largest is St. Augustine with 16,033.

  1. 01St. Augustine16,033
  2. 02St. Augustine Beach6,808
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering St. Johns County

The Census 2024 county adjacency file lists 4 neighbors for St. Johns County. The most populous is Duval County, FL, with 1,055,159 residents. Distances run between Census internal points in a straight line.

Distance to Tallahassee and the nearest big city

Tallahassee is 176.2 miles WNW of St. Johns County's internal point in a straight line. The nearest place of 100,000 or more is Palm Coast, FL (population 106,729), 26.2 miles away. The nearest place of 10,000 or more is St. Augustine, FL (population 16,033), 5.3 miles away.

St. Johns County FIPS code

The FIPS code of St. Johns County is 12109: state code 12 for Florida plus county code 109. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $106,281.

Questions people ask

What is the population of St. Johns County, Florida?

The Census Vintage 2024 estimate for July 1, 2024 is 334,928. That is up 57,823 people (20.9%) from the July 2020 estimate of 277,105.

What is the FIPS code of St. Johns County?

12109. The first two digits (12) are Florida; the last three (109) identify the county.

What is the largest town in St. Johns County?

St. Augustine, with 16,033 residents inside St. Johns County in 2024.

Which counties border St. Johns County?

4 county-equivalents border it in the Census 2024 adjacency file: Duval County, FL; Clay County, FL; Flagler County, FL; Putnam County, FL.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.