Data / Population density / St. Mary Parish

Population density in St. Mary Parish

Population density in St. Mary Parish was 32.2 inhabitants per km² in 2025, according to the U.S. Census Bureau. That is down 0.9% from 2024. That is the 24th highest of 64 counties in 2025.

Compared with Louisiana and United States

Rankings

• Countries by population density 215 places
• EU countries by population density 27 places
• US states by population density 51 places
• Counties in Louisiana by population density 64 places

Definition

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

How to cite

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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More statistics for St. Mary Parish

• Asian population share
• Bachelor's degree or higher, population 25 and over
• Live births, July to June
• Black or African American population share
• Crude birth rate, July to June
• Crude death rate, July to June
• Deaths, July to June
• Foreign-born population share
• Real GDP growth
• GDP per capita, US dollars
• Gross domestic product (GDP), US dollars
• Hispanic or Latino population share
• Homeownership rate (US, housing units)
• Median age
• Median gross rent (monthly)
• Median home value
• Median household income
• Population
• Population aged 65 and over
• Poverty rate (US official measure)
• Unemployment rate
• White (non-Hispanic) population share

All statistics for St. Mary Parish