Unilock Marengo

8302 South IL Route 23, Marengo, IL 60152

LIKELY ACTIVELAST SEEN IN FEDERAL DATA DEC 2025 · 2 SOURCES

Operating signal within 24 months, or from a single source.

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What they make

Concrete Block and Brick Manufacturing327331

Where it is

42.20971, -88.61813 · CENSUS TIGER

COUNTY

McHenry County

METRO AREA

Chicago-Naperville-Elgin, IL-IN

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Other plants nearby

Facility	City	Industry	Status	Distance
Meyer Material CO	Marengo	Ready-Mix Concrete Manufacturing 327320	UNVERIFIED	1.5 KM
Ozinga Ready Mix Concrete INC	Marengo	Ready-Mix Concrete Manufacturing 327320	LIKELY ACTIVE	1.6 KM
Marengo Plant - 286	Marengo	Ready-Mix Concrete Manufacturing 327320	LIKELY ACTIVE	1.7 KM
Stark Services INC	Marengo	Ready-Mix Concrete Manufacturing 327320	UNVERIFIED	5.1 KM
Super Mix INC	Marengo	Ready-Mix Concrete Manufacturing 327320	UNVERIFIED	6.3 KM

Every listed plant in McHenry County

Also at this address

No other federal record shares this street address.

Where this record comes from

2 sources hold this plant, and 7 fields on this page come from them. Each line is one agency’s own record of it: the identifier it is filed under, whether that record shows the plant operating or only that it exists, and when the register first and last saw it there.

EPA cross-references this facility in EIS · EPA site type STATIONARY.

OSHA injury and illness reportsOPERATING
Record 273512 · first seen DEC 2025 · last seen DEC 2025
EPA Facility Registry ServiceEXISTENCE
Record 110071720300 · first seen JUN 2017 · last seen JUN 2024

ALSO RECORDED ASUNILOCK CHICAGO INC

IN MCHENRY COUNTY23 other plants share this one’s industry (Cement and Concrete Product Manufacturing, NAICS 3273); 3 of them have a size band on record.

What each source says

Every field below, as each source filed it. The value this page shows is marked; where the sources disagree, the field says so. Status is computed from independent sources; nothing here is self-reported unless marked Claimed.

Name: EPA: UNILOCK CHICAGO INC · JUL 2026
Street address: EPA: 8302 S IL ROUTE 23 · JUL 2026
City: EPA: MARENGO · JUL 2026
State: EPA: IL · JUL 2026
County (FIPS code): EPA: 17111 · SEP 2026
CoordinatesSOURCES DISAGREE: Census geocoder: 42.20970849431,-88.618132302106 · JUL 2026 · ON THIS PAGE; EPA: 42.208444,-88.616724 · JUL 2026
Employees (band): OSHA: 20-99 · DEC 2025

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