Businesses in Monroe County, Illinois

As of October 20, 2026, ListRiver's records show 2,431 active registered businesses in Monroe County, Illinois, the 28th most among Illinois counties. 62% are LLCs. 31 were formed in September 2026.

From official Illinois registry records, updated weekly. Look up a Illinois business by name.

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Businesses on record

2,431

Formed in the last 12 months

325

Formed in September

With a phone number

13%

327 records

New Monroe County businesses per month

Businesses on record by formation month, through September 2026. Monthly Illinois new-business reports · Get the list of 31 new businesses formed in September 2026

Entity types

LLCs1,503 · 62%
Corporations657 · 27%
Nonprofits269 · 11%
Other2 · 0%

Top cities

Columbia1,249 · 51%
Waterloo1,060 · 44%
Valmeyer47 · 2%
Fults41 · 2%
Hecker19 · 1%
Maeystown8 · 0%
Collinsville3 · 0%
Renault2 · 0%
Newton1 · 0%
Troy1 · 0%

Top ZIP codes

ZIP 622361,248 · 51%
ZIP 622981,059 · 44%
ZIP 6229549 · 2%
ZIP 6224442 · 2%
ZIP 6224823 · 1%
ZIP 622568 · 0%
ZIP 622792 · 0%

Newest business names registered in Monroe County

Get all 2,431 Monroe County businesses · see price Just the 72 formed in the last 90 days · see price

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This is a small sample, not the full list. To keep automated scrapers from copying our data, we only show a handful of records on public pages. Your downloaded list includes every matching business.

Business	City	Type	Formed
Name hidden	Columbia	LLC	Oct 2026
Name hidden	Waterloo	LLC	Oct 2026
Name hidden	Waterloo	LLC	Oct 2026
Name hidden	Columbia	LLC	Oct 2026
Name hidden	Waterloo	LLC	Oct 2026
Name hidden	Columbia	LLC	Oct 2026
Name hidden	Waterloo	LLC	Oct 2026
Name hidden	Fults	LLC	Oct 2026
Name hidden	Waterloo	LLC	Oct 2026
Name hidden	Waterloo	LLC	Oct 2026
Name hidden	Waterloo	LLC	Oct 2026
Name hidden	Renault	LLC	Oct 2026
Name hidden	Columbia	LLC	Oct 2026
Name hidden	Waterloo	LLC	Oct 2026
Name hidden	Columbia	LLC	Oct 2026
Name hidden	Columbia	LLC	Oct 2026
Name hidden	Waterloo	LLC	Oct 2026
Name hidden	Columbia	LLC	Sep 2026
Name hidden	Columbia	LLC	Sep 2026
Name hidden	Columbia	LLC	Sep 2026
Name hidden	Waterloo	LLC	Sep 2026
Name hidden	Waterloo	LLC	Sep 2026
Name hidden	Columbia	LLC	Sep 2026
Name hidden	Columbia	LLC	Sep 2026
Name hidden	Waterloo	LLC	Sep 2026

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Common questions about Monroe County businesses

How many businesses are registered in Monroe County, Illinois?

ListRiver has 2,431 active registered businesses in Monroe County, Illinois on record as of October 20, 2026, from official Illinois business registry data. Dissolved and defunct businesses are not counted.

How many new businesses were formed in Monroe County, Illinois in September 2026?

31 businesses on record in Monroe County, Illinois were formed in September 2026.

How many new businesses opened in Monroe County, Illinois in the last 12 months?

325 businesses on record in Monroe County, Illinois were formed in the 12 months through September 2026.

What is the most common type of business in Monroe County, Illinois?

LLCs are the most common: 1,503 of 2,431 businesses on record (62%), followed by Corporations with 657 (27%).

Where does this data come from?

From Illinois's official business registry. ListRiver loads each new state file, standardizes it, removes duplicates and updates its database weekly. Email and industry details are added from SMBCredit.net where available.

How do I get a list of businesses in Monroe County, Illinois?

Use ListRiver's list builder to filter Monroe County, Illinois businesses by entity type, formation date, industry and contact details, see the exact count and price, and download a CSV. Every list includes monthly refresh files.

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<div style="max-width:520px"><iframe src="https://listriver.com/embed/new-businesses/illinois/monroe-county" title="New businesses in Monroe County, Illinois by month" width="100%" height="370" style="border:0" loading="lazy"></iframe><p style="font:13px sans-serif;margin:4px 0 0">Source: <a href="https://listriver.com/business-lists/illinois/monroe-county">Businesses in Monroe County, Illinois</a>, ListRiver</p></div>

About this data

Counts come from official Illinois business registry records on file with ListRiver, current as of October 20, 2026. They include businesses that are active on the state register; dissolved and defunct entities are excluded. Contact details are added from SMBCredit.net where available. Formation months reflect the registration date the state reports. See the methodology for sources, update schedules and known limits.