St. Mary Parish, LA Population Statistics: Density Map Data
Analyze local population trends, population density map, housing costs, and the local economy.
Area Snapshot Statistics
Key statistics on population, economy, housing, and commuting compared to state and national averages. Explore interactive maps for deeper analysis.
Population: density and quick facts
| Metric | St. Mary Parish | Louisiana Avg | U.S. Average |
|---|---|---|---|
| Population | 47,431 | 4,588,640 | 334,821,731 |
| Population density (per sq mi) | 42.4 | 87.6 | 85.8 |
| Population growth (%/yr) | -1.29% | -0.07% | 0.57% |
| Median age | 38.5 | 35.4 | 37.1 |
| Households | 18,705 | 1,781,402 | 128,459,983 |
Population in St. Mary Parish declined by 5.2% from 2009 to 2023, reaching 48,455 in 2023.
Population Growth 2009–2023
Race & Ethnicity
Economy
St. Mary Parish has a the economy index of D, which means it is barely prosperous.
| Metric | St. Mary Parish | Louisiana Avg | U.S. Average |
|---|---|---|---|
| Median household income | $52,129 | $60,029 | $78,145 |
| Income growth (%/yr) | 3.61% | 3.98% | 5.07% |
| Unemployment rate | 5.4% | 6.3% | 5.2% |
The median household income in St. Mary Parish is about 13% lower than in Louisiana.
Housing
| Metric | St. Mary Parish | Louisiana Avg | U.S. Average |
|---|---|---|---|
| Median home price | $177,419 | $166,764 | $242,182 |
| Median rent | $839 | $1,038 | $1,342 |
| Homeownership rate | 69.8% | 67.3% | 65.1% |
The median home price in St. Mary Parish is about 17.6 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $839 per month for that long.
Commute Time & Mobility
Commuters in St. Mary Parish spend about 32 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 132 hours, about 5.5 full days, spent commuting.
| Metric | St. Mary Parish | Louisiana Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 15.8 | 21.3 | 22.5 |
| Round-trip commute (min) | 31.6 | 42.6 | 44.9 |
| Yearly time spent (hours) | 132 | 177 | 187 |
| Estimated yearly cost | $4,084 | $5,502 | $5,803 |
| Work from home | 5.2% | 7.2% | 13.4% |
| Highway traffic (vehicles/day) | 5,986 | 8,275 | 8,813 |
| Local road traffic (vehicles/day) | 771 | 1,164 | 1,355 |
Fastest commutes among counties in
Louisiana:
Madison Parish (12.9 min), East Carroll Parish (13.7 min), Lincoln Parish (15.4 min).
Slowest:
East Feliciana Parish (33.1 min), St. Helena Parish (32.3 min), Livingston Parish (32.0 min).
The average commute time in St. Mary Parish is 16 minutes, shorter than the 21 minutes in Louisiana.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
St. Mary Parish has a education index of F, which means it scores poorly in education.
| Metric | St. Mary Parish | Louisiana Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 11.6% | 24.0% | 31.6% |
| Average household size | 2.55 | 2.52 | 2.54 |
Highest education index among counties in
Louisiana:
Orleans Parish (0.3), East Baton Rouge Parish (0.3), St. Tammany Parish (0.3).
Lowest:
East Carroll Parish (0.1), Assumption Parish (0.2), Evangeline Parish (0.2).
Health
St. Mary Parish has a health index of C, which means it is somewhat healthy.
| Metric | St. Mary Parish | Louisiana Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 74.0 | 75.1 | 78.3 |
| Self-rated poor health | 23.0% | 22.3% | 16.3% |
| Smokers | 23.5% | 23.9% | 19.0% |
Highest health index among counties in
Louisiana:
St. Tammany Parish (0.8), Ascension Parish (0.8), Vernon Parish (0.8).
Lowest:
East Carroll Parish (0.7), Madison Parish (0.7), Tensas Parish (0.7).
Frequently Asked Questions
Common questions about St. Mary Parish, Louisiana.
What is the population of St. Mary Parish, Louisiana?
The population of St. Mary Parish, Louisiana is 47,431, compared to the U.S. total of 334,821,731.
What is the population density of St. Mary Parish, Louisiana?
The population density of St. Mary Parish, Louisiana is 42.4 people per square mile, compared to the U.S. average of 85.8 people per square mile.
What is the median household income in St. Mary Parish, Louisiana?
The median household income in St. Mary Parish, Louisiana is $52,129, compared to the U.S. median of $78,145.
What is the median home price in St. Mary Parish, Louisiana?
The median home price in St. Mary Parish, Louisiana is $177,419, compared to the U.S. median of $242,182.
What is the unemployment rate in St. Mary Parish, Louisiana?
The unemployment rate in St. Mary Parish, Louisiana is 5.4%, compared to the U.S. average of 5.2%.