County profile · Louisiana
St. Mary Parish, LA market data
How St. Mary Parish compares with other counties for 56 business types: competitors, household spending, official counts and growth.
- Population, 2025
- 46,552
- −5.3% since 2020
- Households
- 18,463
- Median household income
- $52,576
- +29.9% vs. 2015–2019, before inflation
- Median home value
- $138,900
- Jobs located here
- 20,344
- Highest market score
- 64
- Lawn, cleaning and pest control, #354 of 1,771 scored counties
A site report maps the competitors on map listings around any address in St. Mary Parish by name and distance, and the households and spending within reach. Or open the report at the center of St. Mary Parish. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardSurvey estimates 2020–2024 · population estimates 2025 · official business counts 2023 · map listings September 2026 · Data credits · How we measure
What this means
St. Mary Parish has an estimated 46,552 people and 18,463 households. Population estimates put the population change in St. Mary Parish from 2020 to 2025 at −5.3%, against +3.1% for the U.S. Median household income in St. Mary Parish is $52,576, 35% below the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 29.9%, before inflation.
Relative to the U.S., household spending in St. Mary Parish runs highest on vehicle insurance (an index of 111, where 100 is the U.S. average) and lowest on memberships, classes and admissions (53).
Of the business types scored in St. Mary Parish, lawn care, cleaning and pest control companies (64); real estate businesses (57); and coffee shops and cafes (52) have the highest Groundwork market scores. For lawn care, cleaning and pest control companies, that ranks #354 of 1,771 scored counties.
St. Mary Parish is part of the Morgan City area. Against the U.S., map listings per household run highest for funeral homes (2.6 times the U.S. rate) and lowest for real estate agents and brokers (79% below the U.S. rate).
All 56 business types in St. Mary Parish
Highest Groundwork market score first. Each score compares St. Mary Parish with other counties for that business type, from 0 to 100. Spending per listing divides a whole spending line (all vehicle repairs, all eating out) by one type’s listings: the demand for each competitor, not a business’s revenue. Compare it across markets with its index, where 100 is the U.S. figure for the same type; the real estate types, whose line is all housing costs, show the index only. How the score works.
| Business type | Score | Rank among counties | Listings | Per 10k households | Spending per listing | Spending per listing vs. U.S. (100) | Official establishments |
|---|---|---|---|---|---|---|---|
| Lawn, cleaning and pest control | 64 | #354 of 1,771 | 6 | 3.2 | $3.8M | 229 | 15 |
| Real estate | 57 | #703 of 2,229 | 23 | 12.5 | Index only | 244 | 6 |
| Coffee shops and cafes | 52 | #926 of 2,063 | 12 | 6.5 | $4.8M | 129 | 3 |
| Pizza | 51 | #967 of 2,090 | 8 | 4.3 | $7.2M | 141 | 30 |
| Real estate agents and brokers | 51 | #970 of 2,176 | 12 | 6.5 | Index only | 371 | Under 3 |
| Pet businesses | 50 | #1,075 of 2,200 | 11 | 6.0 | $1.2M | 138 | Under 3 |
| Dentists and orthodontists | 47 | #1,029 of 1,886 | 9 | 4.9 | $1.9M | 197 | 12 |
| Physical therapy | 44 | #867 of 1,422 | 6 | 3.2 | $2.9M | 121 | 5 |
| HVAC and plumbing | 42 | #1,129 of 1,707 | 9 | 4.9 | $4.9M | 103 | 14 |
| Property management | 40 | #619 of 910 | 5 | 2.7 | Index only | 87 | 3 |
| Collision repair and body shops | 36 | #974 of 1,327 | 5 | 2.7 | $2.8M | 92 | 4 |
| Bakeries and dessert shops | 35 | #1,475 of 1,889 | 17 | 9.2 | $3.4M | 82 | 3 |
| Insurance agencies | 35 | #1,632 of 2,272 | 27 | 14.6 | $1.5M | 118 | 22 |
| Home repair trades | 35 | #1,693 of 2,057 | 20 | 10.8 | $2.2M | 91 | 26 |
| Optometrists and eye care | 33 | #1,033 of 1,302 | 6 | 3.2 | $2.9M | 93 | 3 |
| Clothing and shoe stores | 33 | #1,618 of 2,087 | 23 | 12.5 | $1.3M | 101 | 9 |
| Roofing and gutters | 32 | #957 of 1,177 | 7 | 3.8 | $6.3M | 75 | 3 |
| Clothing, shoes and laundry | 32 | #1,788 of 2,210 | 33 | 17.9 | $890K | 101 | 9 |
| Child care and preschools | 31 | #1,316 of 1,611 | 11 | 6.0 | $561K | 56 | 7 |
| Fast food and sandwich shops | 31 | #1,802 of 2,222 | 24 | 13.0 | $2.4M | 78 | 30 |
| Mortgage brokers and lenders | 30 | #775 of 887 | 5 | 2.7 | Index only | 125 | Under 3 |
| Primary care and pediatrics | 30 | #1,374 of 1,656 | 11 | 6.0 | $1.6M | 89 | 21 |
| Doctors, dentists and clinics | 30 | #2,077 of 2,394 | 98 | 53.1 | $178K | 116 | 41 |
| Hair salons | 29 | #2,050 of 2,339 | 39 | 21.1 | $354K | 82 | 6 |
| Restaurants and cafes | 26 | #2,162 of 2,405 | 200 | 108.3 | $287K | 77 | 60 |
| Funeral homes | 25 | #1,312 of 1,472 | 10 | 5.4 | $277K | 41 | 5 |
| Sit-down restaurants | 25 | #2,202 of 2,405 | 107 | 58.0 | $537K | 81 | 26 |
| Salons, barbers and spas | 25 | #2,229 of 2,385 | 80 | 43.3 | $173K | 81 | 10 |
| Gas stations | 19 | #2,223 of 2,358 | 34 | 18.4 | $1.4M | 58 | 28 |
| Spas and skin care | 17 | #1,718 of 1,769 | 16 | 8.7 | $864K | 99 | Under 3 |
| Nail salons | 16 | #1,263 of 1,328 | 14 | 7.6 | $987K | 59 | 4 |
| Convenience stores | 14 | #2,133 of 2,261 | 27 | 14.6 | $3.7M | 47 | 10 |
| Auto repair shops | 12 | #2,353 of 2,378 | 48 | 26.0 | $294K | 66 | 23 |
| Barbershops | 11 | #1,297 of 1,356 | 11 | 6.0 | $1.3M | 67 | Under 3 |
| Gyms | 11 | #1,741 of 1,792 | 12 | 6.5 | $802K | 62 | Under 3 |
| Grocery stores | 11 | #2,003 of 2,070 | 21 | 11.4 | $4.7M | 51 | 12 |
| Grocery and convenience stores | 11 | #2,345 of 2,402 | 56 | 30.3 | $1.8M | 52 | 22 |
| Gyms, studios and classes | 10 | #2,057 of 2,088 | 21 | 11.4 | $458K | 69 | Under 3 |
| Car washes and detailing | 8 | #1,434 of 1,451 | 9 | 4.9 | $1.6M | 62 | 6 |
| Martial arts and dance studios | 7 | #1,320 of 1,334 | 8 | 4.3 | $1.2M | 60 | Under 3 |
| Laundromats | 6 | #774 of 785 | 5 | 2.7 | $5.9M | 47 | Under 3 |
| Auto repair and car care | 6 | #2,398 of 2,401 | 84 | 45.5 | $168K | 63 | 40 |
| Tire shops | 5 | #1,524 of 1,530 | 14 | 7.6 | $1M | 40 | 7 |
| Chiropractors | Not scored | Not scored | 4 | 2.2 | $4.4M | 182 | Under 3 |
| Electricians | Not scored | Not scored | 4 | 2.2 | $11M | 92 | 9 |
| Pet stores | Not scored | Not scored | 4 | 2.2 | $3.3M | 74 | Under 3 |
| Veterinarians | Not scored | Not scored | 4 | 2.2 | $3.3M | 123 | Under 3 |
| Landscaping and lawn care | Not scored | Not scored | 3 | 1.6 | $7.7M | 263 | 10 |
| Dry cleaners | Not scored | Not scored | 2 | 1.1 | $14.7M | Too few | Under 3 |
| House cleaning | Not scored | Not scored | 2 | 1.1 | $11.5M | Too few | 5 |
| Oil change and quick lube | Not scored | Not scored | 2 | 1.1 | $7.1M | Too few | 3 |
| Home inspectors | Not scored | Not scored | 1 | 0.5 | Index only | Too few | Under 3 |
| Pest control | Not scored | Not scored | 1 | 0.5 | $23.1M | Too few | Under 3 |
| Pet grooming and boarding | Not scored | Not scored | 1 | 0.5 | $13.4M | Too few | Under 3 |
| Yoga, Pilates and fitness studios | Not scored | Not scored | 1 | 0.5 | $9.6M | Too few | Under 3 |
| Urgent care and walk-in clinics | Not scored | Not scored | 0 | 0.0 | None listed | None listed | Under 3 |
Household spending in St. Mary Parish
What households here spend in a year on each line, in total and per household, with the index against the U.S. average (100).
| Spending line | A year, all households | Per household | Index vs. U.S. (100) |
|---|---|---|---|
| Vehicle maintenance and repairs | $14.1M | $765 | 80 |
| Gasoline and other fuels | $46.9M | $2,539 | 98 |
| Food away from home | $57.4M | $3,110 | 76 |
| Groceries | $99.4M | $5,381 | 85 |
| Personal care products and services | $13.8M | $748 | 74 |
| Child care and other personal services | $6.2M | $334 | 58 |
| Memberships, classes and admissions | $9.6M | $521 | 53 |
| Medical and dental services | $17.4M | $943 | 73 |
| Pets | $13.4M | $725 | 80 |
| Clothing, shoes and related services | $29.4M | $1,591 | 77 |
| Vehicle insurance | $40.1M | $2,171 | 111 |
| Home repairs, maintenance and insurance | $44.1M | $2,389 | 79 |
| Lawn care, cleaning and other household services | $23.1M | $1,250 | 88 |
| Rent and homeowner costs | $242.9M | $13,157 | 79 |
Household spending is estimated from the incomes of the households in each neighborhood, using what households at each income spent nationally in 2024, adjusted for the region. It counts what residents spend, wherever they spend it.
Population and households in St. Mary Parish
- Population, 2025 estimate
- 46,552−5.3% since 2020
- Households
- 18,463
- Median age
- 39.8
- Homes lived in by their owners
- 69%
- Vehicles per household
- 1.6
- Land area
- 559 sq. mi.
- People per square mile
- 86
- Median household income
- $52,576+29.9% vs. 2015–2019, before inflation
- Average household income
- $71,245
- Median home value
- $138,900
- Jobs located here
- 20,344
- Daytime population
- 47,916Residents who don’t work, plus everyone whose job is here
Looking at a specific site in St. Mary Parish?
These figures cover the whole county. A site report draws rings around one address and counts what’s inside them: households, spending, jobs, and the competitors on map listings by name and distance, for any of the 56 business types.
Or open the report at the center of St. Mary Parish. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardRelated markets
Nearest counties in Louisiana 8
- Assumption Parish, LA20,484 people
- Iberia Parish, LA68,599 people
- Iberville Parish, LA29,815 people
- Terrebonne Parish, LA106,186 people
- St. James Parish, LA19,528 people
- Lafourche Parish, LA96,252 people
- Ascension Parish, LA130,314 people
- St. Martin Parish, LA51,353 people
Questions
How fast is St. Mary Parish, LA growing?
Population estimates put St. Mary Parish at 46,552 people in 2025, down 5.3% since 2020, against +3.1% for the U.S. It has 18,463 households. Median household income rose 29.9% from the 2015–2019 survey, before inflation.
How much do households in St. Mary Parish, LA spend?
Households in St. Mary Parish spend about $242.9M a year on rent and homeowner costs, $99.4M on groceries and $57.4M on food away from home. Set against the U.S., households in St. Mary Parish spend the most on vehicle insurance (an index of 111, where 100 is the U.S. average) and the least on memberships, classes and admissions (53).
Which business types have the highest market scores in St. Mary Parish, LA?
The highest Groundwork market scores in St. Mary Parish are for lawn care, cleaning and pest control companies (64); real estate businesses (57); and coffee shops and cafes (52). St. Mary Parish ranks #354 of 1,771 scored counties for lawn care, cleaning and pest control companies.
How does St. Mary Parish, LA compare with the U.S.?
The median household income in St. Mary Parish is $52,576 a year, 35% below the U.S. median of $80,734. The population fell 5.3% from 2020 to 2025, against +3.1% for the U.S. The median home value is $138,900, against $332,700 for the U.S. For its number of households, St. Mary Parish has the most map listings, relative to the U.S., for funeral homes (2.6 times the U.S. rate) and the fewest for real estate agents and brokers (79% below the U.S. rate).
What is the Groundwork market score?
The Groundwork market score runs from 0 to 100 and compares a market with others of its kind for one business type: states with states, metro areas with metro areas, small-town markets and counties with their own. It weighs household spending per competitor (35%), households per business with payroll (25%), population growth (20%) and spending power (20%), each ranked against those peers. A higher score means that, taken together, the market has more household spending and more households for each business already there, faster population growth and more spending per household than similar markets. It describes a market, not any one site or deal. 43 of the 56 business types have a score in St. Mary Parish, each ranked against other counties.
How can I see the market around a specific site?
Run a Groundwork site report on an address in St. Mary Parish. It maps the competitors on map listings near the site and sizes the households and spending within the distance you choose. New accounts get 10 actions over 3 days, no card.
All markets in Louisiana · Every U.S. market · How we measure
Screening a site or an acquisition in St. Mary Parish?
A site report maps the competitors on map listings near an address and sizes the households and spending around it.
The button opens the report at the center of St. Mary Parish. Signed out, you see a blurred preview; on an account, each report is one action.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Figures are estimates for research only. Not investment or real estate advice.