County profile · Michigan
St. Clair County, MI market data
How St. Clair County compares with other counties for 56 business types: competitors, household spending, official counts and growth.
- Population, 2025
- 160,486
- +0.1% since 2020
- Households
- 67,816
- Median household income
- $71,270
- +25.1% vs. 2015–2019, before inflation
- Median home value
- $224,600
- Jobs located here
- 41,623
- Highest market score
- 78
- Tire shops, #119 of 1,530 scored counties
A site report maps the competitors on map listings around any address in St. Clair County by name and distance, and the households and spending within reach. Or open the report at the center of St. Clair County. 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. Clair County has an estimated 160,486 people and 67,816 households. Population estimates put the population change in St. Clair County from 2020 to 2025 at +0.1%, slower than the U.S. (+3.1%). Median household income in St. Clair County is $71,270, 12% below the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 25.1%, before inflation.
Relative to the U.S., household spending in St. Clair County runs highest on vehicle maintenance and repairs (an index of 112, where 100 is the U.S. average) and lowest on child care and other personal services (65).
Of the business types scored in St. Clair County, tire shops (78), coffee shops and cafes (77) and physical therapy clinics (73) have the highest Groundwork market scores. For tire shops, that ranks #119 of 1,530 scored counties.
St. Clair County is part of the Detroit-Warren-Dearborn metro area. Against the U.S., map listings per household run highest for home inspectors (2.5 times the U.S. rate) and lowest for barbershops (72% below the U.S. rate).
All 56 business types in St. Clair County
Highest Groundwork market score first. Each score compares St. Clair County 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 |
|---|---|---|---|---|---|---|---|
| Tire shops | 78 | #119 of 1,530 | 9 | 1.3 | $8.1M | 322 | 7 |
| Coffee shops and cafes | 77 | #151 of 2,063 | 35 | 5.2 | $7.3M | 196 | 10 |
| Physical therapy | 73 | #174 of 1,422 | 28 | 4.1 | $3.3M | 138 | 10 |
| Gyms | 72 | #183 of 1,792 | 36 | 5.3 | $1.6M | 121 | 8 |
| Optometrists and eye care | 71 | #177 of 1,302 | 19 | 2.8 | $4.9M | 156 | 10 |
| Barbershops | 71 | #193 of 1,356 | 10 | 1.5 | $6.5M | 345 | Under 3 |
| Spas and skin care | 70 | #219 of 1,769 | 42 | 6.2 | $1.5M | 177 | 8 |
| Bakeries and dessert shops | 70 | #265 of 1,889 | 44 | 6.5 | $5.8M | 139 | 15 |
| Salons, barbers and spas | 70 | #289 of 2,385 | 191 | 28.2 | $340K | 160 | 28 |
| Hair salons | 69 | #326 of 2,339 | 115 | 17.0 | $565K | 131 | 19 |
| Martial arts and dance studios | 68 | #196 of 1,334 | 19 | 2.8 | $3M | 147 | 11 |
| Gyms, studios and classes | 68 | #309 of 2,088 | 64 | 9.4 | $882K | 133 | 19 |
| Yoga, Pilates and fitness studios | 67 | #122 of 777 | 9 | 1.3 | $6.3M | 155 | 8 |
| Collision repair and body shops | 67 | #284 of 1,327 | 20 | 2.9 | $3.6M | 118 | 12 |
| Restaurants and cafes | 67 | #478 of 2,405 | 507 | 74.8 | $501K | 135 | 225 |
| Property management | 66 | #183 of 910 | 7 | 1.0 | Index only | 238 | 8 |
| Nail salons | 66 | #236 of 1,328 | 21 | 3.1 | $3.1M | 185 | Under 3 |
| Child care and preschools | 66 | #355 of 1,611 | 20 | 2.9 | $1.3M | 128 | 20 |
| Clothing, shoes and laundry | 66 | #491 of 2,210 | 96 | 14.2 | $1.3M | 153 | 19 |
| Clothing and shoe stores | 65 | #527 of 2,087 | 69 | 10.2 | $1.9M | 147 | 19 |
| Pizza | 64 | #505 of 2,090 | 44 | 6.5 | $5.8M | 114 | 105 |
| Auto repair shops | 64 | #565 of 2,378 | 132 | 19.5 | $550K | 124 | 59 |
| Auto repair and car care | 64 | #572 of 2,401 | 226 | 33.3 | $321K | 120 | 86 |
| Grocery stores | 63 | #590 of 2,070 | 38 | 5.6 | $10.6M | 114 | 21 |
| Sit-down restaurants | 63 | #607 of 2,405 | 259 | 38.2 | $980K | 148 | 110 |
| Fast food and sandwich shops | 61 | #698 of 2,222 | 78 | 11.5 | $3.3M | 107 | 105 |
| Car washes and detailing | 59 | #498 of 1,451 | 32 | 4.7 | $2.3M | 90 | 7 |
| Funeral homes | 59 | #506 of 1,472 | 16 | 2.4 | $636K | 94 | 8 |
| Grocery and convenience stores | 59 | #829 of 2,402 | 119 | 17.5 | $3.4M | 100 | 39 |
| Mortgage brokers and lenders | 58 | #274 of 887 | 15 | 2.2 | Index only | 158 | 5 |
| Pet stores | 57 | #367 of 974 | 13 | 1.9 | $4.2M | 93 | 3 |
| Veterinarians | 57 | #555 of 1,485 | 19 | 2.8 | $2.9M | 106 | 18 |
| Convenience stores | 57 | #861 of 2,261 | 56 | 8.3 | $7.2M | 91 | 18 |
| Roofing and gutters | 56 | #447 of 1,177 | 23 | 3.4 | $7.8M | 92 | 5 |
| Dentists and orthodontists | 56 | #713 of 1,886 | 70 | 10.3 | $1.3M | 135 | 50 |
| Pest control | 53 | #308 of 699 | 7 | 1.0 | $11.6M | 113 | 6 |
| Gas stations | 53 | #1,033 of 2,358 | 90 | 13.3 | $2.1M | 86 | 52 |
| Electricians | 51 | #555 of 1,160 | 15 | 2.2 | $11.9M | 99 | 39 |
| HVAC and plumbing | 51 | #814 of 1,707 | 39 | 5.8 | $4.6M | 96 | 51 |
| Pet grooming and boarding | 50 | #746 of 1,461 | 33 | 4.9 | $1.7M | 65 | 9 |
| Primary care and pediatrics | 50 | #829 of 1,656 | 42 | 6.2 | $2.2M | 124 | 140 |
| Home repair trades | 50 | #1,029 of 2,057 | 77 | 11.4 | $2.3M | 96 | 95 |
| Pet businesses | 50 | #1,103 of 2,200 | 81 | 11.9 | $677K | 77 | 30 |
| Doctors, dentists and clinics | 50 | #1,165 of 2,394 | 385 | 56.8 | $241K | 158 | 245 |
| House cleaning | 47 | #481 of 847 | 14 | 2.1 | $5.8M | 90 | 23 |
| Insurance agencies | 45 | #1,275 of 2,272 | 72 | 10.6 | $1.6M | 124 | 54 |
| Real estate agents and brokers | 45 | #1,327 of 2,176 | 145 | 21.4 | Index only | 117 | 29 |
| Real estate | 44 | #1,410 of 2,229 | 177 | 26.1 | Index only | 121 | 53 |
| Laundromats | 42 | #484 of 785 | 11 | 1.6 | $11.7M | 94 | Under 3 |
| Chiropractors | 40 | #1,014 of 1,490 | 50 | 7.4 | $1.9M | 78 | 28 |
| Oil change and quick lube | 36 | #362 of 479 | 7 | 1.0 | $10.4M | 76 | 10 |
| Lawn, cleaning and pest control | 32 | #1,505 of 1,771 | 62 | 9.1 | $1.3M | 78 | 108 |
| Landscaping and lawn care | 29 | #1,298 of 1,493 | 41 | 6.0 | $2M | 67 | 79 |
| Home inspectors | 18 | #401 of 415 | 10 | 1.5 | Index only | 35 | 5 |
| Urgent care and walk-in clinics | Not scored | Not scored | 2 | 0.3 | $46.4M | Too few | 7 |
| Dry cleaners | Not scored | Not scored | 0 | 0.0 | None listed | None listed | Under 3 |
Household spending in St. Clair County
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 | $72.6M | $1,071 | 112 |
| Gasoline and other fuels | $185M | $2,728 | 105 |
| Food away from home | $253.9M | $3,744 | 92 |
| Groceries | $401.5M | $5,921 | 94 |
| Personal care products and services | $65M | $959 | 95 |
| Child care and other personal services | $25.7M | $379 | 65 |
| Memberships, classes and admissions | $56.5M | $833 | 85 |
| Medical and dental services | $92.8M | $1,369 | 106 |
| Pets | $54.9M | $809 | 89 |
| Clothing, shoes and related services | $129M | $1,903 | 93 |
| Vehicle insurance | $112.4M | $1,657 | 85 |
| Home repairs, maintenance and insurance | $178.6M | $2,634 | 87 |
| Lawn care, cleaning and other household services | $81M | $1,195 | 84 |
| Rent and homeowner costs | $927.3M | $13,674 | 82 |
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. Clair County
- Population, 2025 estimate
- 160,486+0.1% since 2020
- Households
- 67,816
- Median age
- 44.6
- Homes lived in by their owners
- 81%
- Vehicles per household
- 1.8
- Land area
- 722 sq. mi.
- People per square mile
- 222
- Median household income
- $71,270+25.1% vs. 2015–2019, before inflation
- Average household income
- $90,621
- Median home value
- $224,600
- Jobs located here
- 41,623
- Daytime population
- 129,372Residents who don’t work, plus everyone whose job is here
Looking at a specific site in St. Clair County?
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. Clair County. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardRelated markets
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Questions
How fast is St. Clair County, MI growing?
Population estimates put St. Clair County at 160,486 people in 2025, up 0.1% since 2020, slower than the U.S. (+3.1%). It has 67,816 households. Median household income rose 25.1% from the 2015–2019 survey, before inflation.
How much do households in St. Clair County, MI spend?
Households in St. Clair County spend about $927.3M a year on rent and homeowner costs, $401.5M on groceries and $253.9M on food away from home. Set against the U.S., households in St. Clair County spend the most on vehicle maintenance and repairs (an index of 112, where 100 is the U.S. average) and the least on child care and other personal services (65).
Which business types have the highest market scores in St. Clair County, MI?
The highest Groundwork market scores in St. Clair County are for tire shops (78), coffee shops and cafes (77) and physical therapy clinics (73). St. Clair County ranks #119 of 1,530 scored counties for tire shops.
How does St. Clair County, MI compare with the U.S.?
The median household income in St. Clair County is $71,270 a year, 12% below the U.S. median of $80,734. The population rose 0.1% from 2020 to 2025, against +3.1% for the U.S. The median home value is $224,600, against $332,700 for the U.S. For its number of households, St. Clair County has the most map listings, relative to the U.S., for home inspectors (2.5 times the U.S. rate) and the fewest for barbershops (72% 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. 54 of the 56 business types have a score in St. Clair County, 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. Clair County. 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.
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Screening a site or an acquisition in St. Clair County?
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. Clair County. 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.