County profile · Illinois
St. Clair County, IL market data
How St. Clair County compares with other counties for 56 business types: competitors, household spending, official counts and growth.
- Population, 2025
- 250,708
- −2.5% since 2020
- Households
- 100,846
- Median household income
- $73,854
- +33.8% vs. 2015–2019, before inflation
- Median home value
- $180,300
- Jobs located here
- 90,959
- Highest market score
- 69
- Veterinarians, #297 of 1,485 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 250,708 people and 100,846 households. Between 2020 and 2025, the population of St. Clair County declined 2.5%, against +3.1% for the U.S. Median household income in St. Clair County is $73,854, 9% below the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 33.8%, before inflation.
Relative to the U.S., household spending in St. Clair County runs highest on medical and dental services (an index of 110, where 100 is the U.S. average) and lowest on child care and other personal services (72).
Of the business types scored in St. Clair County, veterinarians (69), bakeries and dessert shops (68) and coffee shops and cafes (67) have the highest Groundwork market scores. For veterinarians, that ranks #297 of 1,485 scored counties.
St. Clair County is part of the St. Louis metro area. Against the U.S., map listings per household run highest for chiropractors (56% above the U.S. rate) and lowest for electricians (48% 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 |
|---|---|---|---|---|---|---|---|
| Veterinarians | 69 | #297 of 1,485 | 21 | 2.1 | $4.1M | 150 | 18 |
| Bakeries and dessert shops | 68 | #311 of 1,889 | 64 | 6.3 | $6.1M | 148 | 30 |
| Coffee shops and cafes | 67 | #381 of 2,063 | 73 | 7.2 | $5.4M | 145 | 27 |
| Electricians | 66 | #222 of 1,160 | 13 | 1.3 | $21M | 175 | 37 |
| Pet stores | 65 | #230 of 974 | 12 | 1.2 | $7.1M | 158 | 6 |
| Pet businesses | 65 | #457 of 2,200 | 74 | 7.3 | $1.2M | 132 | 41 |
| Pet grooming and boarding | 60 | #472 of 1,461 | 30 | 3.0 | $2.9M | 112 | 17 |
| Grocery and convenience stores | 60 | #789 of 2,402 | 163 | 16.2 | $3.7M | 110 | 58 |
| HVAC and plumbing | 59 | #530 of 1,707 | 53 | 5.3 | $5.2M | 108 | 56 |
| Convenience stores | 59 | #797 of 2,261 | 89 | 8.8 | $6.8M | 86 | 17 |
| Yoga, Pilates and fitness studios | 58 | #230 of 777 | 18 | 1.8 | $5.1M | 125 | 21 |
| Dentists and orthodontists | 58 | #640 of 1,886 | 88 | 8.7 | $1.6M | 165 | 76 |
| Grocery stores | 58 | #738 of 2,070 | 50 | 5.0 | $12.1M | 130 | 41 |
| Martial arts and dance studios | 57 | #470 of 1,334 | 47 | 4.7 | $1.9M | 97 | 12 |
| Physical therapy | 57 | #523 of 1,422 | 44 | 4.4 | $3.2M | 135 | 39 |
| Home repair trades | 57 | #697 of 2,057 | 105 | 10.4 | $2.6M | 107 | 114 |
| Spas and skin care | 56 | #667 of 1,769 | 92 | 9.1 | $1.1M | 124 | 13 |
| Gyms | 56 | #692 of 1,792 | 76 | 7.5 | $1.2M | 93 | 21 |
| Nail salons | 54 | #564 of 1,328 | 55 | 5.5 | $1.8M | 108 | 12 |
| Tire shops | 54 | #664 of 1,530 | 36 | 3.6 | $2.9M | 115 | 17 |
| Hair salons | 54 | #969 of 2,339 | 216 | 21.4 | $461K | 107 | 37 |
| Gas stations | 54 | #978 of 2,358 | 81 | 8.0 | $3.2M | 136 | 100 |
| Primary care and pediatrics | 52 | #771 of 1,656 | 70 | 6.9 | $2M | 115 | 134 |
| Gyms, studios and classes | 52 | #958 of 2,088 | 141 | 14.0 | $650K | 98 | 33 |
| Sit-down restaurants | 52 | #1,093 of 2,405 | 542 | 53.7 | $724K | 109 | 140 |
| Restaurants and cafes | 51 | #1,141 of 2,405 | 986 | 97.8 | $398K | 107 | 378 |
| Auto repair shops | 50 | #1,170 of 2,378 | 197 | 19.5 | $528K | 119 | 116 |
| Barbershops | 49 | #714 of 1,356 | 45 | 4.5 | $2.2M | 117 | Under 3 |
| Real estate agents and brokers | 49 | #1,085 of 2,176 | 163 | 16.2 | Index only | 159 | 54 |
| Salons, barbers and spas | 48 | #1,276 of 2,385 | 415 | 41.2 | $240K | 113 | 66 |
| Laundromats | 47 | #410 of 785 | 15 | 1.5 | $13.3M | 107 | 8 |
| Pest control | 46 | #395 of 699 | 14 | 1.4 | $8.9M | 87 | 7 |
| Car washes and detailing | 46 | #826 of 1,451 | 47 | 4.7 | $2.2M | 88 | 15 |
| Auto repair and car care | 46 | #1,362 of 2,401 | 355 | 35.2 | $293K | 109 | 164 |
| Dry cleaners | 44 | #312 of 507 | 15 | 1.5 | $13.3M | 85 | 6 |
| Optometrists and eye care | 44 | #814 of 1,302 | 45 | 4.5 | $3.2M | 101 | 26 |
| Doctors, dentists and clinics | 44 | #1,460 of 2,394 | 712 | 70.6 | $201K | 132 | 320 |
| Pizza | 43 | #1,305 of 2,090 | 91 | 9.0 | $4.3M | 85 | 209 |
| Funeral homes | 42 | #916 of 1,472 | 26 | 2.6 | $545K | 80 | 18 |
| Fast food and sandwich shops | 42 | #1,429 of 2,222 | 142 | 14.1 | $2.8M | 91 | 209 |
| Oil change and quick lube | 41 | #329 of 479 | 10 | 1.0 | $10.4M | 76 | 8 |
| Roofing and gutters | 40 | #815 of 1,177 | 39 | 3.9 | $7M | 83 | 21 |
| Child care and preschools | 40 | #1,098 of 1,611 | 56 | 5.6 | $758K | 76 | 55 |
| Real estate | 40 | #1,603 of 2,229 | 235 | 23.3 | Index only | 139 | 121 |
| Mortgage brokers and lenders | 38 | #659 of 887 | 37 | 3.7 | Index only | 98 | 13 |
| Clothing and shoe stores | 38 | #1,468 of 2,087 | 158 | 15.7 | $1.3M | 100 | 91 |
| Clothing, shoes and laundry | 37 | #1,618 of 2,210 | 215 | 21.3 | $930K | 106 | 105 |
| Property management | 36 | #681 of 910 | 32 | 3.2 | Index only | 80 | 33 |
| Collision repair and body shops | 35 | #997 of 1,327 | 41 | 4.1 | $2.5M | 82 | 33 |
| Chiropractors | 34 | #1,173 of 1,490 | 85 | 8.4 | $1.7M | 70 | 42 |
| House cleaning | 32 | #718 of 847 | 22 | 2.2 | $5.6M | 88 | 60 |
| Landscaping and lawn care | 28 | #1,321 of 1,493 | 72 | 7.1 | $1.7M | 59 | 94 |
| Lawn, cleaning and pest control | 25 | #1,672 of 1,771 | 108 | 10.7 | $1.2M | 69 | 161 |
| Insurance agencies | 22 | #2,030 of 2,272 | 160 | 15.9 | $989K | 79 | 97 |
| Home inspectors | Not scored | Not scored | 3 | 0.3 | Index only | 179 | Under 3 |
| Urgent care and walk-in clinics | Not scored | Not scored | 0 | 0.0 | None listed | None listed | 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 | $104.1M | $1,032 | 108 |
| Gasoline and other fuels | $262.1M | $2,599 | 100 |
| Food away from home | $392.3M | $3,890 | 96 |
| Groceries | $606.4M | $6,013 | 95 |
| Personal care products and services | $99.7M | $988 | 98 |
| Child care and other personal services | $42.4M | $421 | 72 |
| Memberships, classes and admissions | $91.6M | $908 | 92 |
| Medical and dental services | $143M | $1,418 | 110 |
| Pets | $85.6M | $849 | 93 |
| Clothing, shoes and related services | $200M | $1,983 | 96 |
| Vehicle insurance | $158.2M | $1,569 | 80 |
| Home repairs, maintenance and insurance | $273.4M | $2,712 | 90 |
| Lawn care, cleaning and other household services | $124.3M | $1,232 | 87 |
| Rent and homeowner costs | $1.4B | $14,016 | 84 |
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
- 250,708−2.5% since 2020
- Households
- 100,846
- Median age
- 40.3
- Homes lived in by their owners
- 68%
- Vehicles per household
- 1.8
- Land area
- 658 sq. mi.
- People per square mile
- 386
- Median household income
- $73,854+33.8% vs. 2015–2019, before inflation
- Average household income
- $96,153
- Median home value
- $180,300
- Jobs located here
- 90,959
- Daytime population
- 229,240Residents 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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- Madison County, IL264,238 people
- Clinton County, IL36,954 people
- Washington County, IL13,627 people
- Randolph County, IL30,058 people
- Bond County, IL16,716 people
- Jersey County, IL21,274 people
- Macoupin County, IL44,350 people
Questions
How fast is St. Clair County, IL growing?
Population estimates put St. Clair County at 250,708 people in 2025, down 2.5% since 2020, against +3.1% for the U.S. It has 100,846 households. Median household income rose 33.8% from the 2015–2019 survey, before inflation.
How much do households in St. Clair County, IL spend?
Households in St. Clair County spend about $1.4B a year on rent and homeowner costs, $606.4M on groceries and $392.3M on food away from home. Set against the U.S., households in St. Clair County spend the most on medical and dental services (an index of 110, where 100 is the U.S. average) and the least on child care and other personal services (72).
Which business types have the highest market scores in St. Clair County, IL?
The highest Groundwork market scores in St. Clair County are for veterinarians (69), bakeries and dessert shops (68) and coffee shops and cafes (67). St. Clair County ranks #297 of 1,485 scored counties for veterinarians.
How does St. Clair County, IL compare with the U.S.?
The median household income in St. Clair County is $73,854 a year, 9% below the U.S. median of $80,734. The population fell 2.5% from 2020 to 2025, against +3.1% for the U.S. The median home value is $180,300, 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 chiropractors (56% above the U.S. rate) and the fewest for electricians (48% 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.