St. Marks or Saint Marks</blockquote>
A railroad often cited as Florida's first connected the port of St. Marks with the territorial capital, Tallahassee, some 20 miles inland. The line, the Tallahassee Railroad, was constructed about 1836, and until the Civil War it served in the export of Middle Florida's cotton through St. Marks.
The capacity of the St. Marks port was limited, and it was surpassed in the 19th century by the larger port of Apalachicola, served by the Thomasville, Tallahassee and Gulf Railroad via Carrabelle, Florida.
The City of St. Marks was officially incorporated as a municipality in 1963.
St. Marks first appeared in the 1850 U.S. census with a total population of 189.
2010 and 2020 census
{| class="wikitable"
|+St. Marks racial composition<br> (Hispanics excluded from racial categories)<br> (NH = Non-Hispanic)<br>
!Race
!Pop 2010
!Pop 2020
!% 2010
!% 2020
|-
|White (NH)
|284
|242
|96.93%
|88.32%
|-
|Black or African American (NH)
|5
|4
|1.71%
|1.46%
|-
|Native American or Alaska Native (NH)
|1
|0
|0.34%
|0.00%
|-
|Asian (NH)
|1
|3
|0.34%
|1.09%
|-
|Pacific Islander or Native Hawaiian (NH)
|0
|0
|0.00%
|0.00%
|-
|Some other race (NH)
|0
|1
|0.00%
|0.36%
|-
|Two or more races/Multiracial (NH)
|2
|17
|0.68%
|6.20%
|-
|Hispanic or Latino (any race)
|0
|7
|0.00%
|2.55%
|-
|Total
|293
|274
|
|
|-
|}
As of the 2020 United States census, there were 274 people, 167 households, and 140 families residing in the city.
As of the 2010 United States census, there were 293 people, 124 households, and 66 families residing in the city.
2000 census
As of the census of 2000, there were 272 people, 137 households, and 79 families residing in the city. The population density was . There were 168 housing units at an average density of . The racial makeup of the city was 93.75% White, 2.57% African American, 0.74% Native American, 0.37% Asian, 1.10% from other races, and 1.47% from two or more races. Hispanic or Latino of any race were 0.37% of the population.
In 2000, there were 137 households, out of which 16.1% had children under the age of 18 living with them, 43.1% were married couples living together, 9.5% had a female householder with no husband present, and 42.3% were non-families. 36.5% of all households were made up of individuals, and 8.8% had someone living alone who was 65 years of age or older. The average household size was 1.99 and the average family size was 2.56.
In 2000, in the city, the population was spread out, with 15.8% under the age of 18, 7.4% from 18 to 24, 27.6% from 25 to 44, 31.6% from 45 to 64, and 17.6% who were 65 years of age or older. The median age was 44 years. For every 100 females, there were 104.5 males. For every 100 females age 18 and over, there were 110.1 males.
The median income for a household in the city was $25,156, and the median income for a family was $36,250. Males had a median income of $25,234 versus $21,458 for females. The per capita income for the city was $14,994. About 19.1% of families and 19.5% of the population were below the poverty line, including 27.3% of those under the age of eighteen and 6.7% of those 65 or over.
See also
- Apalachee Bay
- San Marcos de Apalache Historic State Park
- St. Marks Light
- St. Marks River
- St. Marks National Wildlife Refuge
- Tallahassee-St. Marks Historic Railroad State Trail
- Edward Ball Wakulla Springs State Park
- Wakulla River