Cost of living answer

Cost of Living in Oak Brook, IL

Cost of Living in Oak Brook, IL has an overall index of 186, 86% above the U.S. baseline of 100. The typical home value is $990,584 (Zillow ZHVI, Aug 2026); typical monthly rent is $2,011 (HUD FY2027 2-bedroom FMR, DuPage County FMR area); and median household income is $175,870 (Census ACS 2024).

Cost index: committed city housing/rent inputs and BEA 2024 metro-area price parities. Home value: Zillow ZHVI market signal as of 2026-08. Rent: HUD FY2027 2-bedroom FMR (40th-percentile recent-mover gross rent), DuPage County FMR area. A place-level signal, not a personal affordability decision or financial recommendation.

Check your household fit Compare Oak Brook

Cost vs U.S.86% aboveModeled index 186 · Zillow Aug 2026 / HUD FY2027 2-bedroom FMR / ACS 2024 / BEA 2024

Typical rent$2,011/moHUD FY2027 2-bedroom FMR · DuPage County FMR area

Typical home value$990,584Zillow ZHVI · Aug 2026

Median household income$175,870Census ACS · 2024 place estimate

Market PressureHigh

Home prices are the main source of pressure. This describes the local market, not your household.

Rent pressure

14%

Typical annual rent divided by local median household income.

Buy pressure

5.6x

Typical home value divided by local median household income.

Common questions

What living in Oak Brook costs, and what the data does and does not explain.

Four questions readers ask most, answered from the committed sources below. Every figure keeps its source, vintage, and limitation; none of it is personal financial advice.

Cost outside housing

How do non-housing costs here compare with the nation?

Day-to-day non-housing costs here sit close to the U.S. baseline.

Non-housing index100100 = U.S. baseline

Goods10720% weight

Services10020% weight

Utilities8410% weight

The index weights goods 107 (20%), services 100 (20%), and utilities 84 (10%) over the non-housing half of the model, where utilities show the widest gap below the national baseline at 84. It excludes rent and home prices, so it is not the overall Regional Price Parity and not the overall cost index. Source: BEA 2024 metropolitan-area price parities.

Housing vs state and nation

Is housing here above or below the state and the country?

Typical home value$990,584Zillow ZHVI

Typical rent$2,011/moHUD FMR

The typical home value is $990,584 (Zillow ZHVI, Aug 2026). It is 221% above the $308,950 median across Illinois cities in this dataset, and 226% above the committed $303,400 U.S. baseline used site-wide (Census ACS 2019–2023).

The typical monthly rent is $2,011 (HUD FY2027 2-bedroom FMR, DuPage County FMR area (40th-percentile recent-mover gross rent)). It is 1% above the $1,996 median across Illinois cities in this dataset, and 49% above the committed $1,348 U.S. baseline used site-wide (Census ACS 2019–2023).

The Illinois median is a cross-city statistic over the 337 committed city home values and 337 committed city rents (Zillow Aug 2026, HUD FY2027, or Census ACS 2024 as matched per place). It is not a statewide household median and it is not appraised market data. U.S. baselines are Census ACS 2019–2023 5-Year national medians used across this site ($303,400 home value; $1,348 monthly gross rent), and have not been refreshed to the ACS 2024 city vintage or the Zillow Aug 2026 vintage. Any city-to-national gap therefore mixes vintages.

Why the numbers look like this

Which local signals explain the difference?

The committed figures split: price-to-income ratio and rent-to-income ratio do not point the same way relative to their baselines (higher ratios and lower vacancy count as one direction, and their opposites as the other). Mixed signals are common and are not a verdict.

Rent-to-income ratioBelow baseline
14% · Typical rent equals about 14% of local median household income (HUD FY2027 2-bedroom FMR DuPage County FMR area rent × 12 ÷ Census ACS 2024 median household income). These are two place-level aggregates, not a measured household or renter burden. The Census ACS 2019–2023 5-Year national medians imply 21%.
Baseline: 21% implied by Census ACS 2019–2023 5-Year national medians
Price-to-income ratioAbove baseline
5.6x · The typical home value is 5.6 times local median household income (Zillow ZHVI Aug 2026 home value ÷ Census ACS 2024 median household income). This is a place-level ratio, not an individual affordability test. The Census ACS 2019–2023 5-Year national medians imply 3.9x.
Baseline: 3.9x implied by Census ACS 2019–2023 5-Year national medians
Vacancy rateNear baseline
9.3% · 9.3% of all housing units here are reported vacant in Census ACS 2024. That counts every vacant unit, including seasonal, occasional-use, and other vacant homes, and it is not current for-sale or for-rent inventory. The population-weighted mean across the committed city dataset is about 8%.
Baseline: about 8% committed city-sample mean
Owner shareAbove baseline
91.1% · 91.1% of occupied units are owner-occupied in Census ACS 2024, against a committed national owner-occupied share of 64.6% (Census ACS 2019–2023 5-Year national medians). This describes tenure mix — more owners usually means a smaller rental stock, not by itself higher or lower pressure.
Baseline: 64.6% committed national owner-occupied share

These are associations inside one committed snapshot, not causal evidence. The dataset has no current listings, pending sales, sale timelines, or construction, migration, income-growth, and unit-mix fields, so nothing here proves or disproves a housing shortage: a low vacancy rate or a high rent-to-income ratio can have several explanations. Treat the figures as context for your own search, not as a cause.

Monthly budget by household size

What might a family of five spend per month here?

Estimated monthly cost for a household of five in Oak Brook: $7,327, of which $2,011 is the exact typical rent and $5,316 is modeled non-housing spending. Everyday non-housing costs here are close to the U.S. baseline.

For five people the estimate is housing $2,011 + non-housing $5,316 = $7,327 per month, or about $1,465 per person before taxes and debt.

Estimated monthly cost, before income tax, debt payments, and savings
Household size	Housing (typical rent)	Non-housing	Estimated total	Per person
1 person	$2,011	$1,723	$3,734	$3,734
2 people	$2,011	$2,799	$4,810	$2,405
3 people	$2,011	$3,718	$5,729	$1,910
4 people	$2,011	$4,547	$6,558	$1,640
5 people (example)	$2,011	$5,316	$7,327	$1,465
6 people	$2,011	$6,040	$8,051	$1,342

Formula: Monthly estimate = housing base + ($3,272 × (household size ÷ 2.5)^0.7 × (non-housing index ÷ 100)). The housing base is this city's exact typical monthly rent; $3,272 is the Census ACS 2019–2023 5-Year national medians median household income ÷ 12 × the model's 50% non-housing basket share.

Inputs: housing base $2,011 (HUD FY2027 2-bedroom FMR, DuPage County FMR area); non-housing index 100 (BEA goods/services/utilities); national median household income $78,538 (Census ACS 2019–2023 5-Year national medians).

Assumptions and limitations behind this table

Model assumptions

The Census ACS 2019–2023 5-Year national medians median household income is treated as a 2.5-person reference household whose non-housing share of the basket is 50% (goods 20% + services 20% + utilities 10%).
Household size is scaled with an economy-of-scale exponent of 0.7. That exponent is a modeling assumption, not a measured equivalence scale.
Housing is held at the same exact typical rent for every household size. Larger households often rent larger units, which this estimate does not model.
The non-housing index is applied as a price level only; it does not change how much a household consumes.

Limitations

This is a modeled planning estimate, not a measured household budget, a quote, or personal financial advice.
It excludes income tax, sales tax, property tax, debt payments (including student loans and car payments), retirement saving, and one-time moving costs.
Zillow, HUD FMR (a 2-bedroom program benchmark for the 40th-percentile recent-mover gross rent, not a market median), and Census values are place- or area-level estimates with sampling error and top-coding, not exact local prices.
BEA price parities are metro-area values, or one national nonmetropolitan proxy shared by every unmatched place — never city- or state-specific.
The income baseline is one committed national value (Census ACS 2019–2023 5-Year national medians) and does not vary by city or by household composition (adults versus children).

Housing and rent: Zillow ZHVI Aug 2026 home value; HUD FY2027 2-bedroom FMR, DuPage County FMR area rent. Top-coded ACS values stay thresholds, never exact medians. Non-housing: BEA 2024 goods, services, and utilities price parities (metro-area match). Why: rent HUD FY2027 2-bedroom FMR, DuPage County FMR area, home value Zillow ZHVI Aug 2026, plus Census ACS 2024 income, vacancy, and owner-occupancy fields. National baselines: Census ACS 2019–2023 5-Year national medians (not refreshed to ACS 2024 or Zillow Aug 2026), so city-to-national gaps mix vintages. Budget: modeled from the committed national median household income and this city's exact rent and BEA non-housing index; assumptions and exclusions are listed with the table. Budget is not produced when rent is top-coded.

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City details

Inspect the numbers when you need them.

Overall cost index186100 = U.S. baseline

Goods1077% above baseline

Services1000% above baseline

Utilities8416% below baseline

Alternatives worth comparing

Other Illinois cities with a useful tradeoff.

Recommendations require usable housing and income data and exclude very small places for a city of this scale.

Wilmette, ILSame-state comparisonRent burden21%Home / income5.3x Compare

Highland Park, ILLower home-price pressure · Similar regional cost contextRent burden21%Home / income4.8x Compare

Northbrook, ILLower home-price pressure · Same-state comparisonRent burden23%Home / income4.5x Compare

Glenview, ILLower home-price pressure · Same-state comparisonRent burden20%Home / income4.9x Compare

Elmhurst, ILLower home-price pressure · Same-state comparisonRent burden20%Home / income4.3x Compare

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Frequently asked questions about Oak Brook

Mortgage benchmark baseline 2026-09-24 is past its weekly update cadence; a newer official vintage exists but is not reflected.

Living in Oak Brook

Is Oak Brook, IL an expensive place to live?+

Yes — Oak Brook is about 86% more expensive than the national average, with an overall Cost Index of 186. Housing is the biggest factor: the typical home here is valued around $990,584, and monthly rents average roughly $2,011. Day-to-day costs like groceries and utilities tend to run higher than average as well.

How does Oak Brook fit a household housing budget?+

Start with housing. Typical monthly rent is $2,011, while local median household income is $175,870. That implies a rent-burden proxy of about 14% of income. This HUD gross rent already includes tenant-paid utilities; other living costs are not included. Use that as a planning signal for whether the place looks manageable under your own household assumptions.

How much are taxes in Oak Brook, IL?+

Illinois uses a flat model; 4.95% is top marginal-rate context. Applying the 1.88% state-level effective owner-occupied proxy to a home worth $990,584 gives a planning estimate near $18,623 per year; it is not a city, county, parcel, or individual tax bill. State plus average local sales-tax context is around 8.98%.

How much does it cost to rent in Oak Brook, IL?+

The typical monthly rent in Oak Brook is around $2,011. That's about 49% higher than the $1,348 national median. For comparison, the median home value here is $990,584, so buyers should also factor in mortgage payments, property taxes, and insurance.

How much does a house cost in Oak Brook, IL?+

The typical home value in Oak Brook is $990,584. With 20% down and the committed 7.03% national 30-year fixed benchmark as of 2026-09-24, principal and interest are roughly $5,288/month before property tax and insurance. This is a planning estimate, not a local lender quote. Baseline is past its weekly update cadence; a newer official vintage exists but is not reflected. About 91% of residents here own their homes.

Are groceries and utilities expensive in Oak Brook?+

Grocery prices in Oak Brook are noticeably pricier compared to the rest of the US (index: 107, where 100 is the national average). Utility bills (electricity, gas, water) are below average (index: 84). Overall, these everyday costs shouldn't cause major surprises if you're moving from another similarly-sized US city.

What is Oak Brook, IL like to live in?+

Oak Brook is a small town with a population of about 8,056. The median age of residents is 55.2, skewing somewhat older — common in established suburban communities. The local poverty rate is 6.63%, well below the national average of 12.4%.