St. Augustine Beach or Saint Augustine Beach
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| align-fn = center
thumb|right|A postcard from St. Augustine Beach in the late 1940s or early 1950s
thumb|right|Sunrise at St. Augustine Beach
Racial and ethnic composition
{| class="wikitable"
|+St. Augustine Beach racial composition<br> (Hispanics excluded from racial categories)<br> (NH = Non-Hispanic)<br>
!Race
!Pop 2010
!Pop 2020
!% 2010
!% 2020
|-
|White (NH)
|5,734
|6,028
|92.84%
|88.61%
|-
|Black or African American (NH)
|43
|33
|0.70%
|0.49%
|-
|Native American or Alaska Native (NH)
|15
|6
|0.24%
|0.09%
|-
|Asian (NH)
|72
|78
|1.17%
|1.15%
|-
|Pacific Islander or Native Hawaiian (NH)
|2
|4
|0.03%
|0.06%
|-
|Some other race (NH)
|7
|47
|0.11%
|0.69%
|-
|Two or more races/Multiracial (NH)
|71
|233
|1.15%
|3.42%
|-
|Hispanic or Latino (any race)
|232
|374
|3.76%
|5.50%
|-
|Total
|6,176
|6,803
|
|
|-
|}
2020 census
As of the 2020 census, St. Augustine Beach had a population of 6,803. The median age was 53.4 years. 15.4% of residents were under the age of 18 and 30.3% of residents were 65 years of age or older. For every 100 females there were 93.0 males, and for every 100 females age 18 and over there were 89.6 males age 18 and over.
100.0% of residents lived in urban areas, while 0.0% lived in rural areas.
There were 3,108 households in St. Augustine Beach, of which 20.6% had children under the age of 18 living in them. Of all households, 53.2% were married-couple households, 15.4% were households with a male householder and no spouse or partner present, and 24.8% were households with a female householder and no spouse or partner present. About 26.8% of all households were made up of individuals and 14.5% had someone living alone who was 65 years of age or older.
2010 census
As of the 2010 United States census, there were 6,176 people, 5,494 households, and 2,546 families residing in the city.
2000 census
At the 2000 census
{| class="wikitable"
! Position !! Name !! Term Expiration
|-
| Mayor
| Dylan Rumrell
| 2028
|-
| Vice Mayor
| Beth Sweeny
| 2028
|-
| Commissioner
| Undine C. George
| 2026
|-
| Commissioner
| Donald Samora
| 2026
|-
| Commissioner
| Virginia Morgan
| 2026
|-
| City Manager
| Max Royle
| Appointed
|}
Transportation
thumb|Major roadways, St. Augustine Beach and vicinity
Highways
- runs north–south.
- 25px County Road A1A runs north–south.
- runs east–west
Buses
Bus service is operated by the Sunshine Bus Company. Though based in the city, it also serves neighboring St. Augustine including the historic districts, and the rest of the county. Buses operate mainly between shopping centers across town, but a few go to Hastings and Jacksonville, where one can connect to JTA for additional service across Jacksonville.
Education
thumb|Anastasia Island Branch Library
It is in the St. Johns County School District.
The zoned elementary schools include: R. B. Hunt Elementary School, which serves almost all of the city; and W. D. Hartley Elementary School, which serves a small portion.
The zoned middle schools include: Sebastian Middle School, which serves almost all of the city; and Gamble Rogers Middle School, which serves a small portion.
The zoned high schools include: St. Augustine High School, which serves almost all of the city; and Pedro Menendez High School, which serves a small portion.
St. Johns County Public Library maintains the Anastasia Island Beach Branch.
Notable person
- Mike Waltz, nominee for U.S. Ambassador to the United Nations; former U.S. National Security Advisor and U.S. representative