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St. Clair County

Find a Financial Advisor in St. Clair County

St. Clair County sits across the Mississippi River from St. Louis, and many of its households live in Illinois and earn a living on both sides of the river. Get matched with an advisor who serves the Belleville and O’Fallon area, by phone or video.

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  • Advisors who serve the St. Clair County area
250,708Population (2025 estimate)
$73,854Median household income
$180,300Median home value
31.8%Adults with a bachelor’s degree or higher

Updated October 2026. Local figures from the U.S. Census Bureau.

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The short answer

St. Clair County is the heart of the Metro East, with a median household income of $73,854 and a median home value of $180,300. Many residents commute or work for employers tied to the military, healthcare, government and the St. Louis region. Advisors who serve Belleville, O’Fallon and nearby communities, by phone or video, can help with taxes, retirement, insurance and investing.

Key takeaways for St. Clair County

  • Illinois does not tax most retirement income, but property tax bills run high.
  • Working in Missouri while living in Illinois can create two state tax filings.
  • Government and military careers come with pensions and benefits that need a timeline.
  • Older housing and river-area flood exposure make insurance checks a regular job.
  • Pick an advisor who explains costs in dollars and shows how they are paid.

St. Clair County at a glance: jobs on both sides of the river

St. Clair County is the Illinois half of a two-state metro area. Scott Air Force Base, near O’Fallon and Shiloh, is a major source of military and civilian jobs, and the contractors, vendors and families around it shape the local economy. Healthcare, education, logistics, retail along the Fairview Heights corridor and local government fill out the rest. Many residents cross a bridge each morning to work in St. Louis, and many others stay on the Illinois side, working in Belleville or the surrounding towns.

According to the U.S. Census Bureau, 2020 to 2024 American Community Survey, St. Clair County has 250,708 residents, a median age of 39.9 and a median household income of $73,854. The median home value is $180,300, median gross rent is $1,090, and 68.4% of homes are owner-occupied. About 17.3% of residents are 65 or older, 31.8% of adults hold a bachelor’s degree or higher, and unemployment is 6.0%. Income is solid for the region, and homes cost far less than on the coasts, which gives families room to save.

Wealth management in St. Clair County

The wealth in this county tends to be built on steady careers more than on a single windfall. A federal civilian employee in O’Fallon with twenty-five years of service, a retired officer with a military pension, a dentist in Belleville and a couple who sold a trucking company all have different needs, but each has to coordinate investments, taxes and a legacy.

A wealth manager can pull in the retirement accounts, a pension, rental homes and a business into a single plan. Families with a mix of pre-tax and Roth accounts benefit from deciding which account to spend first, and those with a taxable account should consider how gains and losses are handled each year. Illinois has a state estate tax that starts at a lower level than the federal one, so even households that feel moderately wealthy should check how a will and trusts are set up. Confirm current thresholds with an estate attorney. Our estate planning guide explains the basics.

Investment advisors in St. Clair County

An investment advisor chooses or recommends the securities in your accounts. The difference between advisors is mostly about incentives and process. Ask whether the person is a registered investment adviser, how they are paid and whether they use low-cost funds or sell proprietary products.

For federal workers and service members, the Thrift Savings Plan is often the biggest account, with a short menu of funds. An advisor can look at that account together with an IRA and a spouse’s plan, then suggest a mix. A couple in Mascoutah in their forties might hold mostly stock funds for the long run, with a plan to shift gradually as retirement nears. The Illinois job market has its ups and downs, so a cash cushion of several months of expenses comes before any investing.

Before you meet, read our investing guide so the vocabulary is familiar.

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Retirement planning in St. Clair County

Illinois does not tax Social Security benefits or most retirement income from pensions and retirement accounts, which is a real advantage. It makes the retirement picture different from states that do tax those dollars. Property tax, however, is high in Illinois, and a retiree on a fixed income feels it every year. Ask the planner to include a rising tax bill in the projection and look at senior exemptions you may qualify for.

A civilian federal worker retiring from Scott Air Force Base should map out the pension, any Social Security, the savings plan and health coverage in the years before 65. Military retirees have their own benefits and a separate health plan, which changes the Medicare conversation. Dual-income households should coordinate retirement dates so that benefits and healthcare line up.

Another question is where to live. Some retirees stay in Belleville for the family and the doctors. Others move south for the weather. Either choice changes taxes and costs, and a plan should test both. Our retirement planning guide walks through withdrawal order and benefit timing.

Life insurance in St. Clair County

Most households here need life insurance for plain reasons: a mortgage on a home in Swansea, a child in school, a spouse who would have to adjust. Term coverage fits those needs at the lowest cost, and a policy that lasts until the youngest child is grown and the mortgage is paid is a common target.

Military families and federal employees often have group coverage through the job. That coverage is useful but may end when the job does, and it may not be enough. Ask what you would have if you left tomorrow. Illinois residents who work in St. Louis should also check a group policy that follows them to a new employer.

For older adults, the question might be whether to keep a policy that has been in place for decades. Review the cost, the cash value and who the beneficiaries are. Our life insurance guide compares term and permanent coverage.

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Financial planners in St. Clair County

Planners are useful when several decisions collide. A couple in Fairview Heights, one working for a hospital and the other for a contractor, might ask: should we pay extra on the mortgage or add to retirement accounts? How much do we need for a child’s college? What happens if one of us loses a job? A planner can put each choice side by side over time.

The CFP credential is a common mark of training, and it is worth asking about, along with whether the planner acts as a fiduciary and how they are compensated. Since a planner who serves the area can meet by video, you do not need to cross the river for an appointment. Our budgeting and saving guide is a good first stop if you have not set up a monthly plan.

What financial advisors cost in St. Clair County

Some advisors bill a percentage of assets under management each year. Others charge a retainer, a flat project fee or an hourly rate. Some are paid through commissions on insurance and annuities. The honest question is: how much will I pay in total, and for what? Ask for it in writing and in dollars, including fund costs. A fair price for a single plan is not the same as a fair price for ongoing management, so compare the same service across firms.

How to choose a financial advisor in St. Clair County

Begin with a few phone calls. Ask each advisor how they work with people in your situation, such as a federal employee, a service member or a small business owner. Confirm their registration with the securities regulators and read their disclosure document. Ask who will answer when you call. Compare how each one explains a recent decision, and trust the person who uses plain words. If the first meeting is mostly a sales pitch, move on.

Taxes and paperwork when you live in Illinois and work in Missouri

Many Metro East residents earn wages in Missouri. Illinois and Missouri do not have a reciprocity agreement, so you may file a Missouri nonresident return and then claim a credit on your Illinois return. The forms are manageable, but they are easy to get wrong, and your employer may withhold for the wrong state. Check your pay stub in January and talk to a tax preparer if the numbers look odd.

Illinois taxes income at a flat rate, and the state taxes some things that other states do not. It does not tax most retirement income. Confirm current rules with the Illinois Department of Revenue or a tax professional.

Flood plains, old homes and mine subsidence

The American Bottom, the broad flat land along the Mississippi, has a long history of flooding, and levees protect much of it. Even if you do not live next to the river, heavy rain can overwhelm creeks and drains, so ask your agent about flood insurance, which is separate from a standard homeowners policy. Check the flood map for any address you plan to buy. Parts of the region also have old underground coal mines, and Illinois has a mine subsidence insurance program that homeowners may want to ask about. Older homes in Belleville may need a new roof, a sewer line or an electrical update, so keep a repair fund equal to one or two percent of the home’s value each year.

Moving in, moving out: Metro East transitions

People move to St. Clair County for a military assignment, a hospital job or a lower cost of living than the coasts. Military families often arrive with a short horizon and may sell in two or three years, so renting out the home or selling quickly are both live options. Run the numbers on each before buying.

For those leaving, moving out of Illinois changes the state estate tax picture and the filing requirements. Keep records of your move date, update your will and powers of attorney and tell your accounts.

Housing and the cost of living across the Metro East

With a median home value of $180,300 and median gross rent of $1,090, St. Clair County is far less expensive than the coastal metros, and that gap is the single biggest planning advantage here. A family can buy a solid house in Belleville or Mascoutah with a mortgage that leaves room to save. The Census figure for typical owner costs with a mortgage is $1,679 a month, so a household with an income near the county median can carry a home without stretching.

The trap is spending the difference. A couple who saves the money they would have spent on a coastal mortgage can retire years earlier than a couple who upgrades the car, the boat and the kitchen all at once. Decide in advance how much of each raise goes to savings. Even an extra 3 percent of pay moved to a retirement account each year makes a visible difference after a decade.

Property tax in Illinois is high relative to home values, so compare listings by total monthly cost, not price alone. Two houses at the same price in different school districts can carry very different tax bills. Ask for the most recent tax bill, and remember that a purchase can trigger a reassessment. Renters should ask what share of income goes to rent and whether saving for a down payment is on a realistic timeline.

College, caregiving and family costs in St. Clair County

Families here have several choices for college: Southwestern Illinois College in Belleville for the first two years, state universities in Illinois and Missouri, and private schools in the St. Louis area. Starting at a community college and transferring can cut the total bill sharply, and many families pair that approach with a 529 savings plan. Illinois offers a state-sponsored plan with its own tax treatment, so ask a tax professional how a contribution would be handled. Our college savings guide explains how these accounts work.

The other cost that catches families is caregiving. Adults in their fifties and sixties often help aging parents while still supporting children. That can mean reduced hours, travel and nursing home bills. Talk with parents about their insurance, their will and their wishes before a crisis. A short family meeting with an advisor present can make the conversation easier. Ask whether a parent has long-term care coverage, where documents are stored and who holds power of attorney.

Military and federal families also face moves and deployments. A spouse with a portable career, a plan for the house and a clear list of accounts and passwords will save stress. Keep one file with account numbers, insurance policies and the contact information for your advisor and attorney.

Areas we serve in St. Clair County

Advisors who serve the area, by phone or video, work with households across the county. Belleville is the county seat and holds a historic downtown, older neighborhoods and a mix of ages. O’Fallon is a larger suburb with newer homes and strong ties to the air base. Fairview Heights, Swansea, Shiloh and Mascoutah attract families and commuters. Smithton, Freeburg, Millstadt and Lebanon offer a smaller-town feel. East St. Louis, Cahokia Heights and Washington Park are older river communities with their own housing and income needs.

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Frequently asked questions

Does Illinois tax my pension or Social Security?

Illinois generally does not tax Social Security benefits or most retirement income, but federal tax may apply. Confirm current rules with the state revenue department or a tax professional.

I live in Illinois and work in Missouri. Do I file two returns?

Often yes. You may file a Missouri nonresident return and claim a credit on your Illinois return. A tax preparer can confirm.

How should a federal employee plan for retirement?

Map the pension, Social Security, the Thrift Savings Plan and health coverage on one timeline, and decide when each starts.

Does homeowners insurance cover flooding?

No. Flood is a separate policy, so ask your agent and check the flood map for your address.

Can I meet an advisor without going to St. Louis?

Yes. Advisors who serve the area work by phone or video, so you can meet from home.

How do I compare advisors?

Ask each for the total yearly cost in dollars, how they are paid and what services you receive, then compare.

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