Businesses in Winthrop Harbor, Illinois

As of October 20, 2026, ListRiver's records show 286 active registered businesses in Winthrop Harbor, Illinois. 54% are LLCs. 1 were formed in September 2026.

From official Illinois registry records, updated weekly. Most Winthrop Harbor businesses are in Lake County. Look up a Illinois business by name.

Get the Winthrop Harbor businesses list

One-time list

All 286 businesses in Winthrop Harbor

$25.00

$25 minimum order. A CSV with every column, plus 6 monthly refreshes.

Buy this list: $25.00 or narrow it down in the list builder

Businesses on record

286

Formed in the last 12 months

Formed in September

With a phone number

10%

29 records

New Winthrop Harbor businesses per month

Businesses on record by formation month, through September 2026. Monthly Illinois new-business reports · Get the list of 1 new businesses formed in September 2026

Entity types

LLCs155 · 54%
Corporations104 · 36%
Nonprofits27 · 9%

Top ZIP codes

ZIP 60096284 · 99%
ZIP 600981 · 0%
ZIP 600691 · 0%

Newest business names registered in Winthrop Harbor

Get all 286 Winthrop Harbor businesses · see price Just the 14 formed in the last 90 days · see price

Opens the list builder with Winthrop Harbor already selected, so you see the exact count and price before you buy. Your list includes addresses, counties, registered agents and more.

See the business names

Enter your email and we'll send you a 6-digit code. Confirm it to see the newest businesses registered in Winthrop Harbor, and on every ListRiver business-list page for 30 days. Free, no account needed.

We may send you occasional emails about ListRiver business data; unsubscribe any time. Privacy · Members: sign in

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	Winthrop Harbor	LLC	Oct 2026
Name hidden	Winthrop Harbor	LLC	Oct 2026
Name hidden	Winthrop Harbor	LLC	Oct 2026
Name hidden	Winthrop Harbor	LLC	Oct 2026
Name hidden	Winthrop Harbor	Nonprofit	Oct 2026
Name hidden	Winthrop Harbor	LLC	Sep 2026
Name hidden	Winthrop Harbor	LLC	Aug 2026
Name hidden	Winthrop Harbor	LLC	Aug 2026
Name hidden	Winthrop Harbor	LLC	Aug 2026
Name hidden	Winthrop Harbor	LLC	Aug 2026
Name hidden	Winthrop Harbor	LLC	Aug 2026
Name hidden	Winthrop Harbor	LLC	Aug 2026
Name hidden	Winthrop Harbor	Corporation	Aug 2026
Name hidden	Winthrop Harbor	Corporation	Aug 2026
Name hidden	Winthrop Harbor	LLC	Jul 2026
Name hidden	Winthrop Harbor	LLC	Jul 2026
Name hidden	Winthrop Harbor	LLC	Jul 2026
Name hidden	Winthrop Harbor	LLC	Jul 2026
Name hidden	Winthrop Harbor	LLC	Jul 2026
Name hidden	Winthrop Harbor	Nonprofit	Jul 2026
Name hidden	Winthrop Harbor	LLC	Jun 2026
Name hidden	Winthrop Harbor	LLC	Jun 2026
Name hidden	Winthrop Harbor	LLC	Jun 2026
Name hidden	Winthrop Harbor	LLC	Apr 2026
Name hidden	Winthrop Harbor	LLC	Apr 2026

Build your Winthrop Harbor business list

See the exact count and price as you filter by county, city, ZIP, entity type and formation date. Download a CSV right away and get monthly refreshes. U.S.-based businesses can pay 20% today and the rest over 6 months with Pay-in-6™, building business credit as they pay.

Build this list

Own a business in Winthrop Harbor?

Before a lender reads your application, its verification system checks your state filing, your exact legal name and your domain against each other. When they don't agree, you're declined and never told why.

Run the same checks free with our affiliated company, Peak Discounters. No account, no card, under a minute.

Run the free lender check

Common questions about Winthrop Harbor businesses

How many businesses are registered in Winthrop Harbor, Illinois?

ListRiver has 286 active registered businesses in Winthrop Harbor, 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 Winthrop Harbor, Illinois in September 2026?

1 businesses on record in Winthrop Harbor, Illinois were formed in September 2026.

How many new businesses opened in Winthrop Harbor, Illinois in the last 12 months?

49 businesses on record in Winthrop Harbor, Illinois were formed in the 12 months through September 2026.

What is the most common type of business in Winthrop Harbor, Illinois?

LLCs are the most common: 155 of 286 businesses on record (54%), followed by Corporations with 104 (36%).

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 Winthrop Harbor, Illinois?

Use ListRiver's list builder to filter Winthrop Harbor, 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.

More Illinois business lists

Cook County Dupage County Lake County Will County Kane County Sangamon County Mchenry County Winnebago County Madison County St. Clair County Champaign County Peoria County Mclean County Kendall County Rock Island County Tazewell County Dekalb County Kankakee County Lasalle County Macon County Adams County Williamson County Grundy County Vermilion County Effingham County Jackson County Boone County Monroe County Whiteside County Ogle County Macoupin County Coles County Stephenson County Henry County Clinton County Woodford County Lee County Marion County Knox County Jefferson County Jo Daviess County Livingston County Bureau County Morgan County Fayette County Randolph County Douglas County Franklin County Christian County Montgomery County Iroquois County Fulton County Logan County Saline County Mcdonough County Piatt County Shelby County Jersey County White County Richland County Hancock County Bond County Union County Pike County Crawford County Washington County Edgar County Clark County Carroll County Wayne County Warren County Moultrie County De Witt County Ford County Perry County Clay County Mercer County Greene County Menard County Wabash County Chicago Springfield Naperville Schaumburg Northbrook Aurora Des Plaines Skokie Rockford Arlington Heights Elgin Orland Park Plainfield Evanston Glenview Joliet Peoria Palatine Downers Grove Park Ridge Du Quoin Shiloh Fairbury Lawrenceville Silvis Coal City Chillicothe Big Rock Volo Lebanon Dundee East Alton Teutopolis Kenilworth Forsyth Saint Joseph Hillsboro Petersburg Marseilles Trenton Mcleansboro Summit Argo Tremont Aledo Mt Zion Newark Flora Casey Carthage Staunton Beardstown Arcola Momence Fulton Stone Park Posen La Salle Coal Valley Brighton Paxton

Put this chart on your website

Free to use on any site, and it updates itself every month. Copy this code and paste it into your page. Preview the chart.

<div style="max-width:520px"><iframe src="https://listriver.com/embed/new-businesses/illinois/winthrop-harbor" title="New businesses in Winthrop Harbor, 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/winthrop-harbor">Businesses in Winthrop Harbor, 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.