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Market MapIllinoisWilliamson

Williamson County

IllinoisPopulation: 67,120
72
/100
Hold
#83 of 1,000 counties
#50 in Illinois (102 counties)
Analysis by RentalCalcs Research·Independent data + algorithm-driven scoring
Updated May 11, 2026Sources: Zillow ZHVI, Zillow ZORI, US Census ACS, Tax Foundation

Market Snapshot

$149,240
Median Home Price
36% below national median
$990/mo
Median Rent
34% below national median
7.96%
Rent-to-Price Ratio
Top 10% nationally
-$139
Est. Monthly Cash Flow
With 20% down at 6.9% rate

Scenario comparison

Same $990/mo rent assumption, 20% down, 6.85% rate. What changes is the acquisition price.
ScenarioPurchase priceMonthly cash flowCap rateCash-on-cash
75% of median
value-add or distressed
$111,930+$57/mo6.9%+2.7%
Median
typical MLS deal
$149,240-$139/mo5.2%-4.9%
125% of median
newer / premium
$186,550-$334/mo4.1%-9.3%

Price History

Historical data from Zillow ZHVI/ZORI

Quick Investment Calculator

20%
5%50%100%

Purchase

Purchase Price$149,240
Down Payment (20%)$29,848
Loan Amount$119,392
Interest Rate6.85%

Monthly Cash Flow

Gross Rent+$990
Monthly P&I-$782
Est. Expenses (35%)-$346
Net Cash Flow-$139/mo
5.2%
Cap Rate (all cash)
-4.9%
Cash-on-Cash Return
7.96%
Rent-to-Price Ratio
Negative leverage: At 6.85% rates, borrowing costs exceed the 5.2% cap rate. All-cash buyers may see better returns.

* Based on county median values. 35% expenses include taxes, insurance, maintenance, vacancy, and property management. Actual results vary by property.

Run Full AnalysisTry House Hack Strategy

Score Breakdown

Overall Investment Score
72/100
72
Cash Flow(30%)
80/100

Based on 7.96% rent-to-price ratio. Higher ratios indicate stronger cash flow potential.

Appreciation(25%)
68/100

Based on 1.8% YoY price growth. Moderate growth (3-8%) scores highest.

Stability(25%)
50/100

Population data not available.

Affordability(20%)
93/100

Price-to-income ratio of 2.5x. Lower ratios indicate more affordable markets.

Scores are calculated using real Zillow home value and rent data, Census population data, and economic indicators. The weighted average produces the overall investment score. Markets with missing rent data use estimated values based on regional averages.

Investment Outlook

Strengths

  • +Above-average rent-to-price ratio (7.96%)
  • +Affordable relative to local incomes
  • +Complete rent data available

Challenges

  • -Negative leverage (cap rate 5.2% < mortgage rate 6.9%)

Economic Indicators

Population
67,120
Median Income
$60,325
vs $57,059 national est.
Unemployment Rate
—
Data pending
Price-to-Income
2.5x
Very affordable

Who this market fits

Best for
  • +All-cash buyers: removing debt service flips the cap rate to actual yield
  • +Value-add operators who can buy below median and force rent up
  • +Institutional or out-of-state investors who target appreciation markets
Skip if
  • −You need positive cash flow on day one at typical leverage
  • −You can't tolerate negative leverage (cap rate below mortgage rate today)

Compare to Nearby Counties

CountyVerdict
CurrentWilliamsonIL
72$149,240$9907.96%Buy
WoodfordIL
72$220,926Est. pending—BuyView
MadisonIL
72$187,237$1,0957.02%BuyView
KankakeeIL
72$211,066$1,3097.44%BuyView
McHenryIL
71$349,331$2,1147.26%BuyView
ChampaignIL
71$226,633$1,3957.38%BuyView

The Bottom Line

HoldWilliamson scores well overall, but a typical leveraged buy-and-hold loses $139/mo at current rates. Consider house hacking, value-add, or all-cash; otherwise a worse score with positive cash flow may be the better deal.

Williamson County in Illinois scores 72/100, ranking #83 of 1,000 US counties (top 11%). At 20% down and current rates, a median-priced rental loses about $139/month; the 7.96% gross rent-to-price ratio doesn't survive debt service. The thesis here is appreciation, value-add, house hacking, or all-cash.

Monthly Cash Flow
$-139/mo
Cap Rate
5.2%
Cash-on-Cash
-4.9%

Related markets

Markets like Williamson with stronger cash flow

  • Kankakee County for cash-flow rentals
  • Champaign County for cash-flow rentals
  • McHenry County for cash-flow rentals

Head-to-head comparisons

  • Williamson vs Woodford for rentals
  • Williamson vs Madison for rentals
  • Williamson vs Kankakee for rentals
All counties in Illinois →

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