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Morgan City, LA

Cost of living in St. Mary Parish, LA

Estimated monthly cost
$2,658/mo
for a single person, all categories combined

Population 48,455 · Last updated May 21, 2026

Cost breakdown

Single person, by category, per month.

Rent $767 29%
Healthcare $480 18%
Federal tax $444 17%
Transport $320 12%
Groceries $315 12%
Energy $186 7%
State tax $91 3%
Water $55 2%

Rent in St. Mary Parish

Fair Market Rents by bedroom count.

Studio
$762
per month
1 bedroom
$767
per month
2 bedroom
$1,006
per month
3 bedroom
$1,314
per month
4 bedroom
$1,622
per month

Source: HUD FMR FY2025

Income and earnings in St. Mary Parish

Annual earnings figures from the Census ACS.

Household income
$51,768
per year
Individual earnings
$37,226
per year
Per capita
$28,157
per year

Source: ACS 2019-2023 5-Year.

Home values in St. Mary Parish

Average values reported by homeowners.

Average home value
$128,000
Annual property tax
$515

Source: ACS 2019-2023 5-Year

Energy costs in St. Mary Parish

Estimated monthly electricity and gas costs.

Electricity
$152
per month · 12.7¢/kWh
Natural gas
$34
per month
Annual total
$2,232
per year

Source: EIA

Healthcare in St. Mary Parish

Insurance premiums and coverage rates.

Individual premium
$480
per month
Family premium
$1,350
per month
Uninsured rate
6.8%

Source: ACS + national avg. Marketplace benchmark premiums are second-lowest Silver plan estimates and do not reflect employer plans, subsidies, or out-of-pocket costs. This is not healthcare advice.

Taxes in St. Mary Parish

State and local tax rates for Louisiana.

State income tax
4.3%
Top marginal rate
State sales tax
4.5%
Combined sales tax
9.6%
incl. average local

Tax rates change. Consult a qualified tax professional for advice on your specific situation. This is not tax advice.

Transportation in St. Mary Parish

Commute patterns and estimated costs.

Average commute
24.7 min
Drive alone
84.1%
Public transit
0.0%
Work from home
5.2%

Source: ACS

Monthly cost estimates for St. Mary Parish

What it costs to live in St. Mary Parish each month.

Single person
$2,658
per month
  • Rent $767
  • Energy $186
  • Water $55
  • Groceries $315
  • Transport $320
  • Healthcare $480
  • Federal tax $444
  • State tax $91
Couple
$3,753
per month
  • Rent $1,006
  • Energy $223
  • Water $65
  • Groceries $522
  • Transport $420
  • Healthcare $864
  • Federal tax $518
  • State tax $135
Family
$6,183
per month
  • Rent $1,314
  • Energy $279
  • Water $75
  • Groceries $792
  • Transport $520
  • Healthcare $1,350
  • Childcare $1,200
  • Federal tax $518
  • State tax $135

Frequently asked questions about St. Mary Parish

Common questions about cost of living, rent and salary.

What is the average rent in St. Mary Parish?

In St. Mary Parish, LA, a one-bedroom apartment averages $767 per month, a two-bedroom averages $1,006 per month, a three-bedroom averages $1,314 per month, according to HUD Fair Market Rent data.

What is the average salary in St. Mary Parish?

In St. Mary Parish, LA, the average household income is $51,768 per year and individual earnings for full-time workers average $37,226 per year, according to U.S. Census Bureau data.

What is the cost of living in St. Mary Parish?

The estimated cost of living in St. Mary Parish, LA is approximately $2,658 per month for a single person, $3,753 for a couple, $6,183 for a family. This includes rent, utilities, groceries, transportation, healthcare, and taxes.

What is the sales tax rate in St. Mary Parish?

The combined sales tax rate in St. Mary Parish, LA is 9.55%, which includes the Louisiana state rate of 4.45% plus an average local rate of 5.10%.

Is St. Mary Parish an affordable place to live?

Based on the data, a single person in St. Mary Parish, LA would need approximately $2,658 per month to cover rent, utilities, food, transport, healthcare, and taxes. The average household income is $51,768 per year ($4,314 per month). St. Mary Parish has a moderate cost of living relative to local earnings.

How much does healthcare cost in St. Mary Parish?

The ACA marketplace benchmark premium in St. Mary Parish, LA is approximately $480 per month for an individual. Approximately 6.8% of residents are uninsured. Actual costs vary based on employer coverage, plan type, and individual circumstances.

What are house prices in St. Mary Parish?

The average home value in St. Mary Parish, LA is $128,000, with average annual property taxes of $515, according to U.S. Census Bureau data.

How does St. Mary Parish compare to other areas?

You can compare St. Mary Parish, LA with any other US county using our comparison tool at /compare. St. Mary Parish is in the Morgan City, LA metro area.

Other counties in Louisiana

Browse the full list of counties in Louisiana, ranked by cost of living.

See all counties in Louisiana

Compare St. Mary Parish with another area

Put two counties side by side to see how rent, taxes and everyday costs stack up.

About this data

All figures on this page come from official U.S. government sources, listed below.

  • HUD FMR FY2025
  • ACS 2019-2023 5-Year
  • EIA
  • ACS + national avg
  • ACS
  • USDA + BEA RPP
Methodology All data sources