St. Marks, Florida Demographics & Population 2026

A note before these figures: with a population of 243, St. Marks's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

St. Marks is a small community located in Florida, within Wakulla County. The total population is 243. It ranks as the 905th most populous out of 955 Census-designated places in Florida.

Age Demographics

The median age in St. Marks is 61.0 years. This is 43% higher than the state median of 42.6 years. Only 1.7% of residents are under 18, indicating fewer families with children. 19.3% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in St. Marks is $62,321. This is 16% lower than the state median of $74,568. It is also 23% lower than the national median of $80,734. The poverty rate stands at 3.7%. This is 71% lower than the state poverty rate of 12.6%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The survey records no unemployed residents in St. Marks, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $256,300. Housing costs are 29% lower than the state median of $359,000. The home-value-to-income ratio is 4.1x. 93.4% of occupied housing units are owner-occupied. This homeownership rate is 38% higher than the state average of 67.6%.

Race & Ethnicity

St. Marks has a predominantly White (non-Hispanic) population, comprising 95.9% of all residents. The White (non-Hispanic) population is significantly higher than the state average (95.9% vs 50.4%).

Education

8.2% of residents aged 25 and older hold a bachelor's degree or higher. This is among the lowest rates in the state, which may correlate with employment and income patterns. This is 76% lower than the state rate of 34.2%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 93.5%.

Data Sources & Methodology

All demographic data for St. Marks, Florida is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Florida state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 955 Census-designated places in Florida. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.