Law firms in St. Louis: a two-state market, where the big offices are and how to check a lawyer

This report is for anyone sizing up St. Louis law firms: a business or family looking for a lawyer, a law graduate choosing where to apply, an analyst, or a company selling to firms. It covers the Census count on both sides of the river, the two state lawyer registries, how to vet a lawyer, and how to prospect firms by size and place.

St. Louis law offices in Census data

County Business Patterns (CBP) 2023 counts offices of lawyers (NAICS 541110) in the St. Louis, MO-IL Metro Area (CBSA 41180).

Two states, one market

The eight counties hold 1,358 of the metro area's offices; the other 35 are in its smaller counties. Three patterns stand out. The city of St. Louis, an independent city counted as its own county, has the region's large offices: 240 of them employ more people than St. Louis County's 668. St. Louis County is the region's small-practice market, with suburban offices averaging under six people. And the Illinois side is a real market of its own, with 268 offices and 1,957 employees, led by Madison County.

Grouped: 1,298 offices have 1 to 19 employees, 83 have 20 to 99 and 12 have 100 or more. The published classes add up to all 1,393 offices, so no St. Louis law office has 500 or more employees.

What CBP doesn't count: it counts offices with paid employees, not firms, so a firm with offices in the city and the county counts twice. Lawyers practicing alone without employees are excluded; the Census Bureau's separate Nonemployer Statistics count 2,170 legal services businesses with no paid employees in the metro area in 2024, a broader category that also includes non-lawyer legal services. In-house and government lawyers are counted in their employers' industries. No St. Louis law firm is an SEC-registered public company.

Checking a lawyer on either side of the river

Missouri. The Missouri Bar's Official Directory of Missouri Lawyers includes every lawyer in good standing with the Supreme Court of Missouri, so the public can confirm that a lawyer is licensed. It shows each lawyer's name, city and bar number, lists inactive lawyers (who aren't eligible to practice), and can be searched by county; a search returns at most 250 results. The bar's separate LawyerSearch lists lawyers who are accepting new clients, by practice area or location.

Illinois. The Attorney Registration and Disciplinary Commission (ARDC) registers every Illinois lawyer and runs a public lawyer search. Its 2025 annual report counts registered attorneys by county of principal office:

Statewide, 96,997 attorneys were registered with the ARDC in 2025. A lawyer at a firm with offices on both sides can hold both licenses, so check the state where your case will be heard.

Choosing a St. Louis firm

1. Pick the side of the river first. A Madison County lawsuit needs an Illinois lawyer; a St. Louis County one needs a Missouri lawyer.
2. Get names from the Bar Association of Metropolitan St. Louis (BAMSL) Find A Lawyer service, the Missouri Bar's LawyerSearch or a lawyer you trust.
3. Confirm the license in the Missouri directory or the ARDC search, and read any discipline record.
4. Match the office to the work. The large offices are concentrated in the city, so start there for a matter that needs a big team. For most personal matters, a smaller practice near you is easier to reach and usually cheaper to run a case through.

Prospecting St. Louis law firms

BAMSL's 100% Club is one of the few public sources that names local firms. It recognizes firms of five or more attorneys in the St. Louis metro area, all licensed in Missouri, whose attorneys are all BAMSL members; the page shows 46 logos, a handful of which are courts, nonprofits or companies rather than law firms. It's a ready list of established firms of five or more lawyers. BAMSL also runs sustaining partner and advertising programs for companies that want to reach its members. For roles by firm size, see selling to law firms.

Illustrative example. The company, prices and results are invented.

Gateway Ledger (gatewayledger.example) runs billing and trust-account bookkeeping for law firms. It targets offices with 10 to 99 employees: 99 + 65 + 18 = 182. It starts with the firms on BAMSL's 100% Club page, which fit the size band and are easy to research, then works through the rest by county. Two contacts per firm (the managing partner and the office or finance manager) gives about 364 people. At a 4% reply rate that's 14 or 15 conversations; if one in four agrees to a billing review, about four reviews, and two clients at $3,000 a month adds $72,000 a year. Splitting the list by state matters here: the Illinois firms report to a different regulator, so lead with what changes for them.

Subject: [Firm]'s billing cycle

Hi [first name],

Firms of [firm]'s size in St. Louis usually close the month with one person reconciling time, invoices and the trust account by hand. We do that work for [number] firms in Missouri and Illinois, and our clients' invoices go out [number] days sooner on average.

Would a 30-minute review of last month's close be useful? You'd get a written list of fixes either way.

[Your name]

Local sources

For the regional business picture, see the largest companies in St. Louis.

Next step: turn these segments into named accounts with how to build a prospect list.