County profile · Illinois
Williamson County, IL market data
Population, household spending and competition for 56 business types in Williamson County, each scored against other counties.
- Population, 2025
- 67,225
- +0.2% since 2020
- Households
- 28,983
- Median household income
- $65,604
- +29.3% vs. 2015–2019, before inflation
- Median home value
- $156,400
- Jobs located here
- 28,604
- Highest market score
- 75
- Grocery stores, #285 of 2,070 scored counties
A site report maps the competitors on map listings around any address in Williamson County by name and distance, and the households and spending within reach. Or open the report at the center of Williamson 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
An estimated 67,225 people live in Williamson County, in 28,983 households. Population estimates show Williamson County grew 0.2% from 2020 to 2025, slower than the U.S. (+3.1%). The median household income in Williamson County is $65,604 a year, 19% below the U.S. median of $80,734. That rose 29.3% from the 2015–2019 survey, before inflation.
Set against the U.S., households in Williamson County spend the most on vehicle maintenance and repairs (an index of 107, where 100 is the U.S. average) and the least on child care and other personal services (62).
The highest Groundwork market scores in Williamson County are for grocery stores (75), grocery and convenience stores (74) and spas and skin care studios (64). Williamson County ranks #285 of 2,070 scored counties for grocery stores.
Williamson County is part of the Marion-Herrin area. For its number of households, Williamson County has the most map listings, relative to the U.S., for funeral homes (2.1 times the U.S. rate) and the fewest for spas and skin care studios (37% below the U.S. rate).
All 56 business types in Williamson County
Highest Groundwork market score first. Each score compares Williamson 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 |
|---|---|---|---|---|---|---|---|
| Grocery stores | 75 | #285 of 2,070 | 9 | 3.1 | $18.6M | 200 | 5 |
| Grocery and convenience stores | 74 | #315 of 2,402 | 37 | 12.8 | $4.5M | 134 | 5 |
| Spas and skin care | 64 | #394 of 1,769 | 21 | 7.2 | $1.3M | 146 | 3 |
| Physical therapy | 61 | #408 of 1,422 | 10 | 3.5 | $3.9M | 160 | 12 |
| Bakeries and dessert shops | 61 | #498 of 1,889 | 18 | 6.2 | $5.8M | 141 | 13 |
| Coffee shops and cafes | 61 | #566 of 2,063 | 23 | 7.9 | $4.6M | 123 | 10 |
| Tire shops | 60 | #523 of 1,530 | 11 | 3.8 | $2.7M | 107 | 4 |
| Auto repair shops | 57 | #873 of 2,378 | 68 | 23.5 | $435K | 98 | 18 |
| Hair salons | 56 | #886 of 2,339 | 60 | 20.7 | $447K | 104 | 9 |
| Mortgage brokers and lenders | 55 | #326 of 887 | 6 | 2.1 | Index only | 165 | 3 |
| Martial arts and dance studios | 55 | #510 of 1,334 | 8 | 2.8 | $2.8M | 141 | 9 |
| Dentists and orthodontists | 55 | #746 of 1,886 | 26 | 9.0 | $1.5M | 151 | 24 |
| Convenience stores | 55 | #927 of 2,261 | 23 | 7.9 | $7.3M | 93 | Under 3 |
| Gyms | 54 | #770 of 1,792 | 20 | 6.9 | $1.1M | 87 | 6 |
| Gyms, studios and classes | 53 | #890 of 2,088 | 30 | 10.4 | $758K | 114 | 15 |
| Salons, barbers and spas | 53 | #1,003 of 2,385 | 110 | 38.0 | $244K | 115 | 15 |
| Gas stations | 53 | #1,015 of 2,358 | 22 | 7.6 | $3.5M | 145 | 38 |
| House cleaning | 52 | #365 of 847 | 5 | 1.7 | $6.7M | 105 | 9 |
| Collision repair and body shops | 52 | #628 of 1,327 | 12 | 4.1 | $2.5M | 80 | 5 |
| Optometrists and eye care | 52 | #639 of 1,302 | 13 | 4.5 | $3M | 95 | 5 |
| Child care and preschools | 52 | #771 of 1,611 | 12 | 4.1 | $874K | 87 | 10 |
| Auto repair and car care | 52 | #1,147 of 2,401 | 120 | 41.4 | $246K | 92 | 32 |
| Barbershops | 51 | #674 of 1,356 | 12 | 4.1 | $2.2M | 119 | Under 3 |
| Nail salons | 51 | #677 of 1,328 | 17 | 5.9 | $1.6M | 94 | 3 |
| Clothing, shoes and laundry | 49 | #1,167 of 2,210 | 55 | 19.0 | $975K | 111 | 15 |
| Chiropractors | 48 | #812 of 1,490 | 19 | 6.6 | $2M | 85 | 8 |
| Primary care and pediatrics | 48 | #896 of 1,656 | 21 | 7.2 | $1.8M | 103 | 46 |
| Clothing and shoe stores | 46 | #1,196 of 2,087 | 43 | 14.8 | $1.2M | 98 | 15 |
| Sit-down restaurants | 45 | #1,425 of 2,405 | 155 | 53.5 | $677K | 102 | 49 |
| Restaurants and cafes | 44 | #1,451 of 2,405 | 283 | 97.6 | $371K | 100 | 122 |
| Pet grooming and boarding | 41 | #942 of 1,461 | 15 | 5.2 | $1.5M | 59 | 5 |
| Roofing and gutters | 40 | #819 of 1,177 | 11 | 3.8 | $6.7M | 79 | 5 |
| Veterinarians | 40 | #975 of 1,485 | 11 | 3.8 | $2.1M | 76 | 9 |
| Doctors, dentists and clinics | 38 | #1,763 of 2,394 | 238 | 82.1 | $162K | 106 | 100 |
| HVAC and plumbing | 36 | #1,328 of 1,707 | 19 | 6.6 | $3.9M | 81 | 28 |
| Lawn, cleaning and pest control | 35 | #1,421 of 1,771 | 27 | 9.3 | $1.2M | 74 | 33 |
| Fast food and sandwich shops | 34 | #1,707 of 2,222 | 47 | 16.2 | $2.2M | 73 | 62 |
| Landscaping and lawn care | 33 | #1,209 of 1,493 | 20 | 6.9 | $1.7M | 57 | 21 |
| Pizza | 32 | #1,725 of 2,090 | 35 | 12.1 | $3M | 59 | 62 |
| Home repair trades | 32 | #1,797 of 2,057 | 42 | 14.5 | $1.7M | 72 | 49 |
| Pet businesses | 32 | #1,821 of 2,200 | 44 | 15.2 | $515K | 59 | 17 |
| Electricians | 31 | #974 of 1,160 | 12 | 4.1 | $6.1M | 51 | 16 |
| Car washes and detailing | 31 | #1,185 of 1,451 | 15 | 5.2 | $2M | 78 | 9 |
| Real estate | 30 | #2,065 of 2,229 | 85 | 29.3 | Index only | 105 | 40 |
| Real estate agents and brokers | 29 | #2,049 of 2,176 | 73 | 25.2 | Index only | 97 | 24 |
| Pet stores | 28 | #807 of 974 | 8 | 2.8 | $2.8M | 63 | 3 |
| Funeral homes | 28 | #1,254 of 1,472 | 13 | 4.5 | $312K | 46 | 9 |
| Insurance agencies | 16 | #2,167 of 2,272 | 62 | 21.4 | $743K | 59 | 38 |
| Laundromats | Not scored | Not scored | 4 | 1.4 | $13.4M | 107 | Under 3 |
| Property management | Not scored | Not scored | 4 | 1.4 | Index only | 173 | 4 |
| Home inspectors | Not scored | Not scored | 2 | 0.7 | Index only | Too few | Under 3 |
| Oil change and quick lube | Not scored | Not scored | 2 | 0.7 | $14.8M | Too few | Under 3 |
| Pest control | Not scored | Not scored | 2 | 0.7 | $16.8M | Too few | 3 |
| Yoga, Pilates and fitness studios | Not scored | Not scored | 2 | 0.7 | $11.4M | Too few | 6 |
| Dry cleaners | Not scored | Not scored | 1 | 0.3 | $53.7M | Too few | Under 3 |
| Urgent care and walk-in clinics | Not scored | Not scored | 1 | 0.3 | $38.5M | Too few | 5 |
Household spending in Williamson 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 | $29.6M | $1,021 | 107 |
| Gasoline and other fuels | $76M | $2,621 | 101 |
| Food away from home | $104.9M | $3,621 | 89 |
| Groceries | $167.7M | $5,785 | 92 |
| Personal care products and services | $26.8M | $926 | 92 |
| Child care and other personal services | $10.5M | $362 | 62 |
| Memberships, classes and admissions | $22.7M | $784 | 80 |
| Medical and dental services | $38.5M | $1,330 | 103 |
| Pets | $22.7M | $782 | 86 |
| Clothing, shoes and related services | $53.7M | $1,851 | 90 |
| Vehicle insurance | $46.1M | $1,589 | 81 |
| Home repairs, maintenance and insurance | $73.4M | $2,533 | 84 |
| Lawn care, cleaning and other household services | $33.6M | $1,158 | 82 |
| Rent and homeowner costs | $385.2M | $13,291 | 80 |
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 Williamson County
- Population, 2025 estimate
- 67,225+0.2% since 2020
- Households
- 28,983
- Median age
- 42.8
- Homes lived in by their owners
- 71%
- Vehicles per household
- 1.8
- Land area
- 420 sq. mi.
- People per square mile
- 159
- Median household income
- $65,604+29.3% vs. 2015–2019, before inflation
- Average household income
- $85,846
- Median home value
- $156,400
- Jobs located here
- 28,604
- Daytime population
- 68,042Residents who don’t work, plus everyone whose job is here
Looking at a specific site in Williamson 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 Williamson County. 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 Illinois 8
- Franklin County, IL37,323 people
- Jackson County, IL53,064 people
- Johnson County, IL13,376 people
- Saline County, IL23,213 people
- Union County, IL16,997 people
- Perry County, IL20,639 people
- Hamilton County, IL7,916 people
- Pope County, IL3,739 people
Questions
How fast is Williamson County, IL growing?
Population estimates put Williamson County at 67,225 people in 2025, up 0.2% since 2020, slower than the U.S. (+3.1%). It has 28,983 households. Against the 2015–2019 survey, median household income rose 29.3%, before inflation.
How much do households in Williamson County, IL spend?
Households in Williamson County spend about $385.2M a year on rent and homeowner costs, $167.7M on groceries and $104.9M on food away from home. Relative to the U.S., household spending in Williamson County runs highest on vehicle maintenance and repairs (an index of 107, where 100 is the U.S. average) and lowest on child care and other personal services (62).
Which business types have the highest market scores in Williamson County, IL?
Of the business types scored in Williamson County, grocery stores (75), grocery and convenience stores (74) and spas and skin care studios (64) have the highest Groundwork market scores. For grocery stores, that ranks #285 of 2,070 scored counties.
How does Williamson County, IL compare with the U.S.?
Median household income in Williamson County is $65,604, 19% below the U.S. median of $80,734. The population rose 0.2% from 2020 to 2025, against +3.1% for the U.S. The median home value is $156,400, against $332,700 for the U.S. Against the U.S., map listings per household run highest for funeral homes (2.1 times the U.S. rate) and lowest for spas and skin care studios (37% 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. 48 of the 56 business types have a score in Williamson 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 Williamson 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.
All markets in Illinois · Every U.S. market · How we measure
Screening a site or an acquisition in Williamson 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 Williamson 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.