Is St. Louis, MO cheaper than Romeoville, IL?

Based on cost of living data, St. Louis, MO is 11.4% cheaper than Romeoville, IL. This translates to saving $852 per month.

What salary do I need in St. Louis, MO to live like I do in Romeoville, IL?

If you earn $150,000 in Romeoville, IL, you'd need approximately $139,776.746 in St. Louis, MO to maintain the same standard of living.

How does housing cost compare between Romeoville, IL and St. Louis, MO?

Housing in St. Louis, MO is 25.3% cheaper than in Romeoville, IL. For a two-bedroom apartment, rent is $1,160/month in St. Louis, MO compared to $1,617/month in Romeoville, IL.

How much can I save per month by moving from Romeoville, IL to St. Louis, MO?

Moving from Romeoville, IL to St. Louis, MO could save you approximately $852 per month, or $10223 per year, based on a $150,000 salary.

Romeoville, IL vs St. Louis, MO: Cost of Living Comparison 2026

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Cost of Living Comparison 2026

📍 Romeoville, IL — ZIP-level rent data · COL adjusted from Chicago, IL area

Current salary in Romeoville, IL

Numbers update automatically as you type

You'd save $852/month moving to St. Louis, MO

$150.0K in your current city equals $139.8K in St. Louis, MO

Rent data from HUD ZIP-level estimates · COL index from Chicago-Naperville-Elgin, IL-IN-WI area

Overall Cost

↓ 11.4%

Less expensive

Monthly Impact

$852

Savings

Annual Impact

$10.2K

Per year

Based on monthly living costs (rent, groceries, utilities, transport, healthcare). Home purchase prices shown separately below.

Romeoville, IL

Population:41K

Cost Index:100

Median Home:$326K

St. Louis, MO

Population:302K

Cost Index:89

Median Home:$145K

Romeoville, IL

The Prairie State

41K

Population

State Tax

Yes

Located in Illinois, this city has a population of 41K residents.

St. Louis, MO

The Show-Me State

302K

Population

State Tax

Yes

Located in Missouri, this city has a population of 302K residents.

Cost Breakdown by Category

Annual spending: Romeoville, IL vs St. Louis, MO

Category	Romeoville, IL	St. Louis, MO	Difference	Change
🏠Housing	$2,506/mo	$1,871/mo	↓ $635less	25.3%
🚗Transportation	$1,526/mo	$1,216/mo	↓ $310less	20.3%
⚡All Utilities	$495/mo	$535/mo	↑ $40.86more	8.3%
🏥Healthcare	$567/mo	$527/mo	↓ $40.12less	7.1%
🛒Groceries	$981/mo	$949/mo	↓ $31.42less	3.2%
📦Other	$1,596/mo	$1,607/mo	↑ $11.14more	0.7%

🏠Housing

↓ 25.3%

Romeoville, IL

$2,506

St. Louis, MO

$1,871

Difference

$635

less

🚗Transportation

↓ 20.3%

Romeoville, IL

$1,526

St. Louis, MO

$1,216

Difference

$310

less

⚡All Utilities

↑ 8.3%

Romeoville, IL

$495

St. Louis, MO

$535

Difference

$40.86

🏥Healthcare

↓ 7.1%

Romeoville, IL

$567

St. Louis, MO

$527

Difference

$40.12

less

🛒Groceries

↓ 3.2%

Romeoville, IL

$981

St. Louis, MO

$949

Difference

$31.42

less

📦Other

↑ 0.7%

Romeoville, IL

$1,596

St. Louis, MO

$1,607

Difference

$11.14

🏛️ Local Income Taxes

St. Louis, MO: St. Louis Earnings Tax$1,500/yr (1.0%)

Romeoville, IL has no local income tax.

Local taxes are in addition to state income tax. Not all cities levy local income taxes.

🏠Rent Comparison

Studio

From$1,343

To$910

↓ $433

1 Bed

From$1,435

To$950

↓ $485

2 Bed

From$1,617

To$1,160

↓ $457

3 Bed

From$2,080

To$1,490

↓ $590

Romeoville, ILZIP-level data

1BR range: $1,670–$2,050/mo

St. Louis, MOZIP-level data

1BR range: $800–$1,480/mo

💡 Note: Rent prices are based on HUD Fair Market Rent data and represent median costs. Actual prices vary by neighborhood, amenities, and condition. Source: HUD Small Area Fair Market Rents FY2026.

$7,669

Monthly in Romeoville, IL

$6,705

Monthly in St. Louis, MO

$964

Difference

Home Values

Romeoville

St. Louis

$326K

Median Value

$145K

↑ +3%

YoY Change

↓ -0.8%

↑ +37%

5-Year Change

↑ +10.9%

$307K - $346K

Price Range

$38K - $302K

Homes in St. Louis are 56% less expensive than Romeoville

Calculate payment - Romeoville Calculate payment - St. Louis

Source: Zillow Home Value Index (ZHVI), January 2026

Tax Comparison

Annual tax burden comparison at $150.0K salary

Tax Savings

↓ $504

More taxes

Monthly Difference

$42.00

Less take-home

Effective Rate Diff

0.3%

Rate difference

Romeoville, IL

Federal Income Tax

Effective: 18.9%

$25.5K

Illinois State Tax

Effective: 5.0%

$7.4K

FICA Taxes

Social Security + Medicare

$11.5K

Total Taxes

Effective: 29.6%

$44.4K

Take-Home Pay

$8,797/month

$105.6K

St. Louis, MO

Federal Income Tax

Effective: 18.9%

$25.5K

Missouri State Tax

Effective: 5.3%

$7.9K

FICA Taxes

Social Security + Medicare

$11.5K

Total Taxes

Effective: 30.0%

$44.9K

Take-Home Pay

$8,755/month

$105.1K

Additional Tax Information

Romeoville, IL Tax Rates

Sales Tax:8.8%

Property Tax:2.2%

St. Louis, MO Tax Rates

Sales Tax:8.2%

Property Tax:1.0%

💡 Note: Tax calculations are estimates based on 2024/2025 tax brackets for single filers with standard deduction. Actual taxes may vary based on filing status, deductions, credits, and local variations.