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County in Illinois

Williamson County, Illinois

Williamson County is a county in Illinois with 66,876 residents, No. 22 of 102 by population. In Williamson County, the FHA loan limit for a one-unit home is $541,287, and a typical home is worth $156,400. To rent a 2-bedroom apartment at Fair Market Rent ($996 a month) without going over 30% of your income, you need to earn about $19.15 an hour.

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  • Typical home price

    $156,400

    −41% vs. Illinois −53% vs. U.S.

    Half of owner-occupied homes are worth more and half are worth less.

    • Williamson
    • Illinois
    • United States

    Source: U.S. Census Bureau, Average 2020–2024

  • Fair market rent, 2 bedrooms

    $996 a month

    −42% vs. Illinois −43% vs. U.S.

    HUD's reference rent for a two-bedroom apartment, with basic utilities.

    • Williamson
    • Illinois
    • United States

    Source: HUD, Fiscal year 2027

  • FHA limit 2026, 1 unit

    $541,287

    FHA national floor limit

    The most you can borrow with an FHA loan for a one-unit home here.

    • Williamson
    • Floor
    • Ceiling

    Source: HUD, 2026 data

  • Property tax

    1.72% of value per year

    −14% vs. Illinois +83% vs. U.S.

    $2,690 a year for the typical owner

    • Williamson
    • Illinois
    • United States

    Source: U.S. Census Bureau, Average 2020–2024

Market now, with Zillow data

Zillow data
Typical home value
$157,730
about the same as 12 months ago
Typical rent
$988 a month
4.9% more than 12 months ago

From Zillow (ZHVI/ZORI), September 2026. The Census figures above are 5-year averages (2020–2024).

Data from October 2026

In short

What is housing like in Williamson County today?

With an FHA loan and the minimum down payment, a typical home would cost about $1,399 a month: 26% of the typical household income here. The typical home value is 41% less than in Illinois overall. The typical property tax is $2,690 a year (about 1.72% of home value), lower than in Illinois.

Sources: U.S. Census Bureau (Average 2020–2024).

Only here

What sets Williamson County apart

  1. Williamson County has the highest typical rent in its area: $930, more than any of its 6 neighboring counties; next is Franklin County ($803).

  2. Nearby, in Franklin County, the typical home value is $89,000: 43% less than in Williamson County ($156,400).

  3. According to Zillow, in the 12 months to September 2026 the typical home value in Williamson County barely changed; in Illinois, it rose 5.3%.

  4. From 2020 to 2025, home prices in Williamson County rose 46% on FHFA's index, about the same as in Illinois (47%).

Sources: U.S. Census Bureau (Average 2020–2024); Zillow (September 2026 data); FHFA (2025 data). Zillow data

The homes here

Housing in Williamson County

What homes there are in Williamson County, what they cost, how that changed and how people live, from Census figures (2020–2024).

What homes there are

U.S. Census Bureau, ACS 5-year, 2020–2024

Kind of home

In Williamson County, 7 in 10 homes are single-family detached houses; in Illinois, 6.

In Williamson County there are many mobile homes: 7% of homes; in Illinois, 2%.

Year built

Here half of the homes date from 1981 or later; in Illinois, from 1971 or later.

Homes in Williamson County are bigger: 63% have 3 bedrooms or more; in Illinois, 58%.

All homes, occupied or empty. A figure the Census cannot measure precisely enough here is not shown.

Census tables: B25024, B25034, B25035, B25041

What it costs here

U.S. Census Bureau, ACS 5-year, 2020–2024

Value of owner-occupied homes

The FHA loan limit for this county is $541,287, and about 97% of owner-occupied homes in Williamson County are worth less than that.

Monthly rent with utilities

Measured against HUD's 2-bedroom fair market rent ($996), about 58% of rented homes in Williamson County cost less.

With a mortgage

$1,374 a month

Illinois: $1,987 a month

Without a mortgage

$560 a month

Illinois: $792 a month

Owners with a mortgage

57%

Illinois: 61%

Owning costs less in Williamson County: with a mortgage, the typical cost is $1,374 a month; in Illinois, $1,987. Without one, $560.

Value: what owners think their home is worth. Rent: rent plus utilities, for homes of every size. The FHA limit is the most an FHA loan (Federal Housing Administration) lends for a one-unit home; the fair market rent (FMR) is the one HUD uses for housing vouchers.

Census tables: B25075, B25063, B25088, B25081

How it changed

U.S. Census Bureau, ACS 5-year, 2015–2019 and 2020–2024

Change since 2015–2019

Much as in Illinois, the typical home value in Williamson County rose 36% since 2015–2019.

Rents in Williamson County rose at about the same pace as in Illinois: 27% since 2015–2019, against 26%.

To compare: typical income in Williamson County rose 29%; the home, +36%; the rent, +27%.

Change between two 5-year periods that do not overlap, in each period's dollars, not adjusted for inflation.

Census tables: B25077, B25064, B19013

How people live

U.S. Census Bureau, ACS 5-year, 2020–2024

MeasureWilliamson CountyIllinoisUnited States
Rental vacancy Unreliable estimate5.0%5.5%
Homeowner vacancy Unreliable estimate1.0%0.9%
More than one person per room Unreliable estimate2.5%3.4%
People per household 2.232.462.53
Drive alone 82%66%69%
Carpool 7%8%9%
Public transit Unreliable estimate6%3%
Walk or bike 1%3%3%
Work from home 9%16%15%
Other means Unreliable estimate1%2%
Typical commute Unreliable estimate20 to 29 minutes20 to 29 minutes

Households in Williamson County are smaller: 2.23 people on average; in Illinois, 2.46.

In Williamson County, 82% of workers drive alone to work; in Illinois, 66%.

Vacancy: empty homes offered for rent or for sale. Rooms: every room in the home, not only bedrooms. Commute: the minute range of the typical worker.

Census tables: B25004, B25003, B25014, B25010, B08301, B08303

Do the math

What would you pay each month in Williamson County?

A typical home is within reach of the typical income

We start with a typical home of $156,400, an FHA loan with 3.5% down and the latest average rate (7.18%). That payment would take 26% of the typical household income here, which is $65,604 a year.

Your numbers

Local data
$

Starts at the typical home value in Williamson County. Change it to the price you have in mind.

Loan type
Your credit score

Your score changes which loans apply and FHA's minimum down payment. Your real rate also depends on your credit.

Down payment
%

That is $5,474 (3.5% of the price). The usual minimum for this loan is 3.5%.

This week's average ± a quarter or half point.

Term

National average as of November 5, 2026 (Freddie Mac); your rate may be different.

Adjust advanced details

Estimated monthly payment

Local data

$1,399

at 7.18% · 30 years

Loan amount
$153,567
Total interest
$220,947
Paid off in
November 2056

Includes $2,641 FHA upfront mortgage insurance premium.

Does it fit the income?

  • Comfortable

    up to $1,531 a month

    Your payment · 26%

  • Tight

    $1,531 to $1,968 a month

  • Hard

    more than $1,968 a month

Compared with the typical household income in Williamson County ($65,604 a year). Reference: HUD calls paying more than 30% of income for housing a cost burden.

Show the result as
per month$1,399
Principal & interest$1,040
Property tax$224
Home insurance$65
FHA mortgage insurance (MIP)$69

You need at least $5,474 for the down payment, plus closing costs.

Next step

This is an estimate to give you an idea, not a loan offer. Your real payment depends on your rate, your credit, and the insurance and taxes on the home you buy.

Buying a home

Buying a home in Williamson County

Here you'll see how prices have changed, how Williamson County compares with Illinois and the country, and what you'd pay each month with four kinds of loans.

How have home prices changed?

According to the FHFA House Price Index, home prices in Williamson County rose 54% in the 10 years through 2025. FHFA's index follows the price of the same homes over the years.

Period Here Illinois United States
In 2025 +5.0% +5.7% +2.9%
5 years (2020–2025) +46% +47% +47%
10 years (2015–2025) +54% +65% +85%
See each year's change

The index follows the prices of the same homes over time (sales and appraisals on loans bought or guaranteed by Fannie Mae and Freddie Mac). It is not the average price of a home. FHFA considers its annual county indexes experimental. Source: FHFA, 2025 data

Williamson County compared with Illinois and the United States

Home value, rent and household income, side by side. "Typical" is the median: half are above it and half below.

Typical home value
  • Williamson $156,400
  • Illinois $263,300
  • United States $332,700
Typical rent a month
  • Williamson $930
  • Illinois $1,274
  • United States $1,413
Typical household income a year
  • Williamson $65,604
  • Illinois $83,390
  • United States $80,734
See the full table
Williamson compared with Illinois and the United States
MeasureHereIllinoisU.S.
Residents66,87612,694,798334,922,499
Typical home value$156,400$263,300$332,700
Typical household income$65,604$83,390$80,734
Typical rent$930$1,274$1,413
Fair Market Rent (2 bedrooms)$996$1,724$1,750
Hourly wage to rent a 2-bedroom$19.15$33.15$33.65
Typical property tax$2,690$5,298$3,119
Effective tax rate1.72%2.01%0.94%
Households that own their home71%67%65%
Renters spending 30% or more on rent46%48%51%
FHA limit (1 unit)*$541,287$541,287$541,287

FHA limit: Illinois shows the median of its counties; the United States, the national floor. Download CSV

Four ways to pay for a typical home in Williamson County

For a typical $156,400 home at Freddie Mac's average rate (7.18% as of November 5, 2026) over 30 years. The monthly payment adds principal and interest, the county's property tax, an example homeowners insurance and mortgage insurance when it applies.

Loan Monthly payment Down payment Loan amount Rate Mortgage insurance Cash to close Minimum score
FHA, 3.5% down $1,399 $5,474 $153,567 7.18% FHA MIP · $69 $10,166 580
Conventional, 5% down $1,370 $7,820 $148,580 7.18% PMI · $74 $12,512 620*
Conventional, 20% down, no PMI $1,137 $31,280 $125,120 7.18% None $35,972 620*
ITIN, 15% down (example) $1,282 $23,460 $132,940 8.18% None $28,152 Set by the lender
  • Cash to close = down payment plus 3% of the price in closing costs (example).
  • Minimum score: FHA requires 580 or higher for the minimum down payment (HUD Handbook 4000.1). * Fannie Mae requires 620 when a loan is underwritten by hand; its automated system has no fixed minimum.
  • The ITIN row is an example with a rate 1 percentage point higher: ITIN loans follow no federal rule and each lender sets its own down payment and rate. Nothing in this table promises an approval.

How much house can I afford? Closing costs

Loan limits

FHA loans in Williamson County use the national floor limit: it isn't a high-cost area. If the loan you need is above these amounts, it doesn't fit FHA or it becomes a "jumbo" loan.

VA loans. If you have full VA entitlement, VA doesn't cap the loan amount. If you've used part of your entitlement, the calculation uses the county limit ($832,750 for one unit). VA loan limits (va.gov)

USDA loans. They're for homes in eligible rural areas and households with incomes within USDA's limit. Check whether the address and your income qualify on the official site. USDA eligibility (usda.gov)

Home type FHA limit Conforming limit
1 unit $541,287 $832,750
2 units $693,050 $1,066,250
3 units $837,700 $1,288,800
4 units $1,041,125 $1,601,750

Source: HUD, 2026 data · Source: FHFA, 2026 data

Taxes and risks

Property tax and flooding in Williamson County

Two costs that change a lot from place to place and that a house payment does include: property tax and, in risk zones, flood insurance.

Property tax

In Williamson County, the typical owner pays $2,690 a year: about 1.72% of the home's value. That is less than the rest of Illinois and more than the national average.

  • Williamson 1.72%
  • Illinois 2.01%
  • United States 0.94%

What Illinois publishes General Homestead Exemption (Illinois Department of Revenue)

Exemptions and deadlines in Illinois

Is there a flood risk?

According to FEMA, in Williamson County 2.4% of homes (715) are in a high-risk flood zone. Of those homes, 15% have NFIP flood insurance.

  • A high-risk zone (Special Flood Hazard Area) has a 1% or greater chance of flooding each year. (44 CFR 59.1)
  • If the home is in that zone and the loan comes from a regulated lender, federal law requires flood insurance for the life of the loan, in communities that take part in the NFIP. (42 U.S.C. 4012a)
  • Most homeowners insurance does not cover flood damage. (FEMA, FloodSmart)

Source: FEMA, As of August 3, 2026

Look up your address on FEMA’s map

Owning a home here

Owning a home in Williamson County

The natural hazards FEMA measures in Williamson County, a maintenance plan for your climate and what the trades earn in your area.

Risks to your home

FEMA, National Risk Index 1.20.0 (December 2025)

In Williamson County, FEMA rates the natural hazard risk as relatively moderate.

To rate it, FEMA weighs the expected loss with social vulnerability and community resilience.

In Williamson County, FEMA expects natural hazards to cause $52.5 million in losses a year, counting buildings, people and crops.

The hazard that would do the most damage to homes and buildings here is earthquake: about $11.5 million a year.

Loss FEMA expects each year to homes and buildings, by hazard
  1. EarthquakeRelatively moderate $11.5 million a year
  2. Inland floodingRelatively low $11.4 million a year
  3. TornadoRelatively moderate $599,812 a year
  4. Winter weatherRelatively high $289,761 a year
  5. HurricaneVery low $34,644 a year

What it means for your home

The ratings are FEMA's own. FEMA says its data is meant for planning and does not replace a local study. Drought is not shown: FEMA counts its loss in crops only.

National Risk Index, version 1.20.0 (December 2025), retrieved November 6, 2026

FEMA notice: This product uses the Federal Emergency Management Agency's National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

Climate and upkeep

Department of Energy (PNNL), 2021 IECC zones

Williamson County is in climate zone 4A of the home energy code (IECC): mixed and humid.

The zone's number says how hot or cold it gets; the letter says how humid: A is moist, B is dry and C is marine.

  • Spring

    • Book the air conditioner's check-up before the heat: ENERGY STAR advises checking the cooling system in the spring, because contractors get busy once summer comes. ENERGY STAR (EPA)
    • Clean and repair the roof gutters. EPA

  • Summer

    • Keep indoor humidity below 60 % (ideally between 30 % and 50 %). A humidity meter is inexpensive and sold at hardware stores. EPA
    • Keep the air conditioner's drip pan clean and its drain line flowing: a plugged drain can cause water damage in the house. ENERGY STAR (EPA)

  • Fall

    • Book the heating check-up in the fall. If it runs on gas or oil, the technician should check the connections: faulty ones are a fire hazard. ENERGY STAR (EPA)
    • Look for drafts at windows and doors: close the window on a piece of paper; if it moves back and forth easily, it needs thicker weather stripping. ENERGY STAR (EPA)

  • Winter

    • Get the house ready for the cold with insulation, caulking and weather stripping, and learn how to keep pipes from freezing. Ready.gov (FEMA)
    • Seal the air ducts that run through the attic, crawlspace, basement or garage with duct mastic or foil tape, then wrap them in insulation. ENERGY STAR (EPA)

All year

  • Check the air filter every month, especially in heavy-use months. If it looks dirty, change it; change it at least every 3 months. ENERGY STAR (EPA)
  • Test the smoke alarms every month and replace their batteries at least once a year. USFA (FEMA)

Each task comes from the official page beside it. The spring air-conditioning and fall heating check-ups are the timing ENERGY STAR advises; the rest is a suggested order.

Climate zones by county, 2021 IECC

What the trades charge here

BLS, wages for May 2025

TradeTypical hourly wage8 in 10 earn between
Electricians$39.72$23.77 and $51.82
Plumbers, pipefitters and steamfitters$38.23$18.61 and $50.68
Heating, air conditioning and refrigeration mechanics$28.57$21.48 and $39.10
Roofers$27.81$19.83 and $31.10
Carpenters$35.51$19.92 and $48.06
Painters, construction and maintenance$25.00$17.84 and $39.73
Maintenance and repair workers, general$27.27$16.42 and $38.96

According to BLS, an electrician earns about $39.72 an hour in the South Illinois nonmetropolitan area; a plumber, about $38.23.

These are workers' hourly wages, not the price of a job.

Need help paying for a repair?

Renting

Renting in Williamson County

The typical rent in Williamson County is $930 a month. HUD also publishes a “fair market rent” by unit size: it's the one programs like Section 8 use.

46% of renter households in Williamson County spend 30% or more of their income on housing. 19% spend half or more.

Fair market rent by size

To pay the fair market rent without spending more than 30% of income, working full time (40 hours a week).

Size Fair rent a month Hourly wage Income needed per year
Studio $694 $13.35 $27,760
1 bedroom $761 $14.63 $30,440
2 bedrooms $996 $19.15 $39,840
3 bedrooms $1,304 $25.08 $52,160
4 bedrooms $1,309 $25.17 $52,360

Includes basic utilities. It isn't the lowest or highest rent: it's a reference point. Source: HUD, Fiscal year 2027

Free help in Williamson County

Programs and counseling in Williamson County

We didn't find counseling agencies near this county.

Official programs for the down payment and loans for buyers. Check which ones you might qualify for with your income and your county.

Three generations of a family gather on the porch of their home.

HUD counseling is free or low-cost

Illinois down payment programs

  1. IHDAccess Home

    Limited funds remain, per the source

    IHDA second loan with deferred payments for first-time buyers in Illinois

    First-time buyers only. Run by Illinois Housing Development Authority (IHDA).

    Deferred Verified November 5, 2026

  2. IHDAccess Forgivable

    Limited funds remain, per the source

    IHDA second loan forgiven little by little over ten years, for the down payment in Illinois

    The source does not say whether you must be a first-time buyer. Run by Illinois Housing Development Authority (IHDA).

    Forgivable Verified November 5, 2026

  3. IHDAccess Deferred

    Limited funds remain, per the source

    IHDA second loan with no payments until you sell or refinance, for the down payment in Illinois

    The source does not say whether you must be a first-time buyer. Run by Illinois Housing Development Authority (IHDA).

    Deferred Verified November 5, 2026

Which programs do I qualify for? See all Illinois programs

Help in Spanish in Williamson County

None of the 0 agencies on this list say they serve in Spanish.

Ask for service in Spanish

When you call, say “Spanish, please” or ask if someone speaks Spanish. If not, ask whether they offer an interpreter.

Public housing agencies

They run public housing and Section 8 vouchers (Housing Choice Vouchers) in this county.

  • Housing Authority of the County of Williamson Public housing and Section 8 vouchers (618) 985-2422
  • Housing Authority of the City of Marion, Illinois Public housing and Section 8 vouchers (618) 997-1258

Free legal help

If you have a problem with your landlord, an eviction notice or a scam, the Legal Services Corporation (LSC) search shows the free legal aid offices that serve your area.

Find legal aid (lsc.gov)

Housing counseling nearby

We didn't find counseling agencies near this county.

Places

Cities in Williamson County

This site has no city pages of Williamson County. The neighboring counties are below.

See all 3 cities of Williamson County

Nearby counties

Each row compares its typical value, typical rent and FHA limit with Williamson County.

Read next

Guides that help here

We picked them by this county's numbers: what weighs most here is what's worth understanding first.

Frequently asked questions

What is the FHA loan limit in Williamson County in 2026?

Williamson County has an FHA limit of $541,287 for a one-unit home. For 2 units it's $693,050, for 3 it's $837,700 and for 4 it's $1,041,125. It's the national floor limit.

What is the conforming loan limit in Williamson County?

Williamson County has a conforming limit of $832,750 for one-unit conventional loans in 2026. A bigger loan is a “jumbo” loan.

How much does a typical home cost in Williamson County?

The typical home value in Williamson County is $156,400 (Average 2020–2024, U.S. Census). Across Illinois it's $263,300.

How much does it cost to rent in Williamson County?

Williamson County has a typical rent of $930 a month (Average 2020–2024, U.S. Census). HUD's fair market rent for a 2-bedroom apartment is $996 (Fiscal year 2027).

How much do you need to earn to rent a 2-bedroom apartment in Williamson County?

About $19.15 an hour working full time (2,080 hours a year), or $39,840 a year, so the fair market rent of $996 stays under 30% of income.

Sources: American Community Survey (Average 2020–2024); FHA mortgage limits (2026 data); Conforming loan limits (2026 data); Fair Market Rents (Fiscal year 2027); Income Limits (Fiscal year 2026); HUD-approved housing counseling agencies (Retrieved November 6, 2026); Public Housing Agencies (Retrieved November 6, 2026); Freddie Mac Primary Mortgage Market Survey (As of November 5, 2026); FHFA House Price Index (2025 data); Homes with flood insurance (As of August 3, 2026); National Risk Index (2025 data); IECC climate zones by county (2021 data); Occupational Employment and Wage Statistics (2025 data); Census Bureau cartographic boundary files (2024 data).