A-
2%
Overall NAT. AVG.
7%
Goods & Services NAT. AVG.
21%
Housing NAT. AVG.
Date & Last Updated: This data reflects 2025 and was released from C2ER in January, 2026; this is the most current data available.
The cost of living index is based on a national average of 100. For example, if the cost of living is 90, then it is 10% lower than average. If the cost of living is 110, then it is 10% higher than average. The breakdown for each index is as follows: goods & services (33%), groceries (13%), health care (5%), housing (30%), transportation (9%) and utilities (10%). If the cost of living data was unavailable for this city, estimates based upon nearby cities were used.
Index O'Fallon Illinois National
Cost of living10298100
Goods & Services9398100
Groceries99100100
Health care89102100
Housing12195100
Transportation90102100
Utilities9498100
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An Overview of Cost of Living in O'Fallon, IL

Are you thinking about relocating, but curious about the potential cost of living in O'Fallon? Is it more expensive or more affordable than average? Based on the most recent report, the cost of living in O'Fallon stands at 102, making it 2% higher than the national average. The cost of living directly affects the affordability of one's desired lifestyle. Knowing the cost of housing, transportation, groceries and other essentials in the new area allows people to gauge whether they can maintain their preferred standard of living.

The cost of living in O'Fallon aligns closely with the national average when compared to other cities across the nation. Everyday essentials such as groceries, goods and services, health care and utility bills are priced at a level consistent with the average in similar urban areas. O'Fallon residents can anticipate that their daily expenses won't be significantly higher than those in an average city, ensuring that the cost of living remains manageable.

Housing costs make up a big chunk of the cost of living in O'Fallon, and they usually eat into a large part of your take-home pay. Unfortunately, in this area, both buying a home and renting one costs 20.9% more than the average city. This includes stuff like home prices, rent, mortgage rates, and insurance.

Is O'Fallon Affordable?

Is O'Fallon an affordable place to live? It's a good question and one that you might want to ask when considering any new city, as affordability can play a huge role in the decision making process. The cost of living index (which we covered above), as well as housing costs and income levels play a vital role in determining the affordability of an area. The median home price in O'Fallon is 21.1% higher than the national average, while the average monthly rent prices are 20.4% higher than average. The affordability of any location can also be influenced by median income levels. O'Fallon has a median household income of $132,987, which is 63.5% higher than the national average.

What Factors can Influence the Cost of Living in O'Fallon?

Groceries: The costs associated with groceries have witnessed substantial increases over the past 2-3 years. In select markets, food prices have escalated by more than 20% during this timeframe, whereas others have seen more restrained upticks. The variances in food expenses can exert a considerable influence on the overall cost of living in a given locale. In O'Fallon, the groceries index is 0.7% lower than the national average.

Healthcare: Healthcare expenses and insurance premiums can vary significantly depending on the specific city or state. Factors such as accessibility to healthcare facilities, out-of-pocket expenses for doctor's visits, dental care expenses, prescription costs and specialized medical care fees can all influence the overall cost of living. In O'Fallon, healthcare costs are 10.6% lower than the national average.

Utilities: As with the prices of anything else, utility costs can exhibit significant variations, contingent on factors like climate, energy source availability, geographic location and state regulations. The expenses associated with electricity, water, heating, and waste disposal can fluctuate, either upward or downward, depending on the particular city or state. In O'Fallon, the utilities index registers 5.8% lower than the national average.

Where is the Data From?

The O'Fallon cost of living data you see above is sourced from the C2ER cost of living index, providing a practical and accurate means of comparing living expenses in urban areas. Updated quarterly, this index gathers data from over 300 independent researchers, covering more than 60 goods and services, in 6 different categories. These selections are made meticulously to represent a wide range of consumer expenditure categories. The weightings applied to cost differences are based on government survey data that tracks spending patterns among professional and executive households. It's important to note that while the C2ER index excludes data on sales or income tax rates, AreaVibes factors tax rates into the overall cost of living score for each region.

Cost Of Living Quick Facts

  • The cost of living in O'Fallon is 4% higher than the Illinois average
  • The cost of living in O'Fallon is 2% higher than the national average
  • O'Fallon housing is 21% higher than the national average
  • Illinois general sales tax is 22% higher than the national average
  • Illinois state income tax is 91% higher than the national average

Most Affordable Places to Live in and Around O'Fallon

See all the best places to live around O'Fallon

Compare O'Fallon, IL Cost of Living

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      Price difference in compared to
      Cost of living index
      Goods & Services index
      Groceries index
      Health care index
      Housing index
      Transportation index
      Utilities index

      Median Income & Debt-To-Income Ratio

      Median Income Per Year Per Month Max Budget (28% DTI) Max Budget (36% DTI)
      Owners$161,488$13,457$3,768$4,845
      Renters$75,154$6,263$1,753$2,255
      The affordability of the housing market in O'Fallon, IL as well as the overall cost of living can be predicted by what percent of the monthly income is spent on housing related costs. This is konwn as the debt-to-income ratio (DTI). The overall rule of thumb is that no more than 28% of your gross income should be spent on the overall costs related to housing and no more than 36% of gross income on all expenses and debts. Among O'Fallon homeowners, the median income is $161,488. This indicates that a monthly maximum of $3,768 should be spent by homeowners on all housing related costs. Renters have a median income of $75,154. This indicates that renters would have a maximum of $1,753 for their rent related monthly costs.

      Illinois Sales Tax

      State General Sales Tax With Max Surtax
      Illinois 6.25% 10.25%

      Illinois Income Tax

      State Income Tax (Low) Income Tax (High)
      Illinois 4.95% 4.95%

      Goods & Services

      Item O'Fallon National avg. Difference
      Haircut $22.69$27.6217.8%
      Beauty Salon $41.19$51.1119.4%
      Toothpaste $4.04$4.091.3%
      Shampoo $1.72$1.5411.5%
      Movie $12.89$12.880.1%
      Yoga $20.35$19.663.5%

      Groceries

      Item O'Fallon National avg. Difference
      Ground Beef $7.84$7.701.8%
      Fried Chicken $1.51$1.669.2%
      Milk $4.75$4.730.4%
      Potatoes $5.24$5.260.3%
      Pizza $11.32$12.7611.3%
      Beer $9.85$10.556.6%

      Health Care

      Item O'Fallon National avg. Difference
      Optometrist $104.21$140.0625.6%
      Doctor $103.31$153.8232.8%
      Dentist $117.88$123.154.3%
      Ibuprofen $11.82$11.730.8%
      Lipitor $23.43$23.610.8%

      Housing

      Item O'Fallon National avg. Difference
      Home Price $395,443.00$326,622.0021.1%
      Avg. Mortgage Payment $2,007.41$2,480.2519.1%
      Apartment Rent $1,738.00$1,444.0020.4%

      Transportation

      Item O'Fallon National avg. Difference
      Gasoline $2.97$3.062.9%
      Tire Balancing $47.61$65.2127.0%

      Utilities

      Item O'Fallon National avg. Difference
      All Electricity $193.81$220.1212.0%
      Phone $204.58$195.714.5%
      Although the cost of living data is updated regularly, this cost of living information is to be used as estimates only as prices can change on an ongoing basis.

      Nearby cities with low cost of living

      City Population Cost of Living Index National Avg.
      Rentchler, IL4946.3%
      Brooklyn, IL4457327.3%
      East St. Louis, IL27,0337623.7%
      Alorton, IL2,1497723.4%
      Centreville, IL5,0987723.1%
      O'Fallon, IL30,1511021.8%

      Cities with similar population

      City Population Cost of Living Index National Avg.
      Southgate, MI30,149946.5%
      Raytown, MO30,162928.4%
      Maryville, TN30,172954.6%
      Oak Park, MI30,129963.9%
      Jamestown, NY30,1278118.7%
      O'Fallon, IL30,1511021.8%
      Date & Last Updated: This data reflects 2025 and was released from C2ER in January, 2026; this is the most current data available.