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Marion-Herrin, IL

Cost of living in Williamson County, IL

Estimated monthly cost
$2,849/mo
for a single person, all categories combined

Population 66,902 · Last updated May 21, 2026

Cost breakdown

Single person, by category, per month.

Rent $786 28%
Federal tax $519 18%
Healthcare $480 17%
Groceries $345 12%
Transport $320 11%
Energy $177 6%
State tax $172 6%
Water $50 2%

Rent in Williamson County

Fair Market Rents by bedroom count.

Studio
$769
per month
1 bedroom
$786
per month
2 bedroom
$1,031
per month
3 bedroom
$1,419
per month
4 bedroom
$1,539
per month

Source: HUD FMR FY2025

Income and earnings in Williamson County

Annual earnings figures from the Census ACS.

Household income
$65,521
per year
Individual earnings
$41,781
per year
Per capita
$37,096
per year

Source: ACS 2019-2023 5-Year.

Home values in Williamson County

Average values reported by homeowners.

Average home value
$145,600
Annual property tax
$2,490

Source: ACS 2019-2023 5-Year

Energy costs in Williamson County

Estimated monthly electricity and gas costs.

Electricity
$116
per month · 16.5¢/kWh
Natural gas
$61
per month
Annual total
$2,124
per year

Source: EIA

Healthcare in Williamson County

Insurance premiums and coverage rates.

Individual premium
$480
per month
Family premium
$1,350
per month
Uninsured rate
5.2%

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 Williamson County

State and local tax rates for Illinois.

State income tax
5.0%
Flat rate
State sales tax
6.3%
Combined sales tax
8.8%
incl. average local

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

Transportation in Williamson County

Commute patterns and estimated costs.

Average commute
23.2 min
Drive alone
81.5%
Public transit
0.3%
Work from home
8.6%

Source: ACS

Monthly cost estimates for Williamson County

What it costs to live in Williamson County each month.

Single person
$2,849
per month
  • Rent $786
  • Energy $177
  • Water $50
  • Groceries $345
  • Transport $320
  • Healthcare $480
  • Federal tax $519
  • State tax $172
Couple
$4,171
per month
  • Rent $1,031
  • Energy $212
  • Water $60
  • Groceries $572
  • Transport $420
  • Healthcare $864
  • Federal tax $742
  • State tax $270
Family
$6,704
per month
  • Rent $1,419
  • Energy $266
  • Water $70
  • Groceries $867
  • Transport $520
  • Healthcare $1,350
  • Childcare $1,200
  • Federal tax $742
  • State tax $270

Frequently asked questions about Williamson County

Common questions about cost of living, rent and salary.

What is the average rent in Williamson County?

In Williamson County, IL, a one-bedroom apartment averages $786 per month, a two-bedroom averages $1,031 per month, a three-bedroom averages $1,419 per month, according to HUD Fair Market Rent data.

What is the average salary in Williamson County?

In Williamson County, IL, the average household income is $65,521 per year and individual earnings for full-time workers average $41,781 per year, according to U.S. Census Bureau data.

What is the cost of living in Williamson County?

The estimated cost of living in Williamson County, IL is approximately $2,849 per month for a single person, $4,171 for a couple, $6,704 for a family. This includes rent, utilities, groceries, transportation, healthcare, and taxes.

What is the sales tax rate in Williamson County?

The combined sales tax rate in Williamson County, IL is 8.82%, which includes the Illinois state rate of 6.25% plus an average local rate of 2.57%.

Is Williamson County an affordable place to live?

Based on the data, a single person in Williamson County, IL would need approximately $2,849 per month to cover rent, utilities, food, transport, healthcare, and taxes. The average household income is $65,521 per year ($5,460 per month). Williamson County has a moderate cost of living relative to local earnings.

How much does healthcare cost in Williamson County?

The ACA marketplace benchmark premium in Williamson County, IL is approximately $480 per month for an individual. Approximately 5.2% of residents are uninsured. Actual costs vary based on employer coverage, plan type, and individual circumstances.

What are house prices in Williamson County?

The average home value in Williamson County, IL is $145,600, with average annual property taxes of $2,490, according to U.S. Census Bureau data.

How does Williamson County compare to other areas?

You can compare Williamson County, IL with any other US county using our comparison tool at /compare. Williamson County is in the Marion-Herrin, IL metro area.

Other counties in Illinois

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

See all counties in Illinois

Compare Williamson County 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