Public engineering firm directory

Find engineering consulting firms by capability and location.

Search engineering firm profiles built for buyers who need a shortlist, not a sales pitch.

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Thompson Civil, LLC

St. Louis, MO

Quality, Safety, and Experience

WebsitePhone2 offices6 projects1 leaders2 credentialsFounded 2003

Project: Vanchi Properties Medical Office Building

Service: TransportationService: Roadway DesignService: Traffic Signal DesignIndustry: Highways & RoadsIndustry: GovernmentType: Civil Engineering+17 more

Thornton Tomasetti

New York, NY

When others say no, we say "Here's How"

WebsitePhone5 offices6 projects2 credentials3 publicationsFounded 1949

Project: Microsoft Mass Timber Data Centers

Service: Structural DesignService: Building Structural DesignService: Megatall, Supertall & Tall BuildingsIndustry: CommercialIndustry: AviationType: Acoustic Consulting+51 more

Thouvenot, Wade & Moerchen, Inc. (TWM)

Swansea, IL

Exceptional Service. Nothing Less.

WebsitePhone1 office2 projects13 credentialsSize Estimate: 200+ employeesUpdated Jun 2026

Project: Pierce Terrace Elementary School

Service: Transportation & Traffic EngineeringService: Roadway DesignService: Traffic & Safety StudiesIndustry: TransportationIndustry: Highways & RoadsType: Civil Engineering+34 more

Three Pillar Structural Engineering Group

Chicago, IL

The Art, Science, and Construction of Engineering

WebsitePhone2 offices5 projects1 credentialsFounded 2020Updated Jun 2026

Project: Chicago Architectural Bicentennial Art Installations

Service: Structural Engineering DesignService: Reinforced Concrete DesignService: Structural Steel DesignIndustry: CommercialIndustry: ResidentialType: Structural Engineering+13 more

Toltz, King, Duvall, Anderson and Associates, Incorporated

Minneapolis, MN

Engineering | Architecture | Planning

Website6 offices12 projects1 leadersFounded 1910Updated Jun 2026

Project: Runway 14-32 Extension - Morris Municipal Airport

Service: Transportation EngineeringService: Aviation EngineeringService: Rail EngineeringIndustry: TransportationIndustry: AviationType: Civil Engineering+42 more

Tracs Engineering

Teutopolis, IL

Superior Industrial, Manufacturing, and Utility Automation Solutions

WebsitePhone1 office5 projects1 leadersUpdated Jun 2026

Project: Sherwin Williams Automation Support

Service: Automation & Controls IntegrationService: Robotics & Vision IntegrationService: PLC & HMI ProgrammingIndustry: ManufacturingIndustry: UtilitiesType: Automation & Controls+11 more

Trotter and Associates, Inc.

St. Charles, IL

Civil Engineering and Design for Municipal and Public Projects

WebsitePhone1 office6 projects1 credentialsUpdated Jun 2026

Project: Well No. 8 Water Treatment Plant Rehabilitation

Service: Civil Engineering DesignService: Water Distribution SystemsService: Sanitary Collection SystemsIndustry: GovernmentIndustry: Water SupplyType: Civil Engineering+50 more

Unified Theory Inc

Woodbury, MN

An Engineering Partner For Your Evolving Needs

WebsitePhone4 offices2 leadersFounded 1998Updated Jun 2026

Service detail: Engineering Design

Service: Engineering DesignService: MechanicalService: CivilIndustry: CommercialIndustry: IndustrialType: Architecture & Engineering+25 more

Upper Consulting, Inc.

Quincy, IL

Process Mechanical Engineering Consulting

WebsitePhone1 office8 projectsUpdated Jun 2026

Project: Alexandria Company for Seed Processing - Multiseed Crush Plants

Service: Plant & Process EngineeringService: Process Development (Continuous & Batch)Service: PFD & P&ID Creation & UpdatingIndustry: AgricultureIndustry: Food & BeverageType: Process Engineering+38 more

V3 Companies

Chicago, IL

The Vision to Transform with Excellence

Website14 offices7 projects15 leaders2 credentialsFounded 1983Updated Jun 2026

Project: Elgin O'Hare Western Access Project

Service: Land DevelopmentService: Site Civil EngineeringService: Environmental ConsultingIndustry: CommercialIndustry: EducationType: Civil Engineering+49 more

Valdes Architecture & Engineering

Lombard, IL

Unmatched talent leads to extraordinary results.

WebsitePhone3 offices18 projects15 leaders4 credentialsFounded 1992

Project: Lake Shore Drive Bridge Inspections

Service: ArchitectureService: Engineering DesignService: Civil DesignIndustry: Oil & GasIndustry: ChemicalsType: Architecture & Engineering+39 more

Vega Wave Systems, Inc.

West Chicago, IL

Engineering Services for Photonics

WebsitePhone1 officeUpdated Jun 2026

Service detail: Photonics and Optoelectronics Engineering

Service: Photonics and Optoelectronics EngineeringService: Photonics engineeringService: Optoelectronics engineeringIndustry: DefenseIndustry: AerospaceType: Electrical Engineering+4 more

WHKS & Co.

Mason City, IA

Developing People. Creating Solutions. Shaping the Horizon.

WebsitePhone8 offices3 projects2 leaders10 credentialsFounded 1948

Project: Bushel Boy Farms Development

Service: Transportation EngineeringService: Bridges and Highway StructuresService: RoadwaysIndustry: Highways & RoadsIndustry: BridgesType: Civil Engineering+33 more

WRF Engineers

Edwardsville, IL

Custom electrical, mechanical, and plumbing engineering solutions

WebsitePhone1 office8 projects4 leaders3 credentialsUpdated Jun 2026

Project: Wood River Rec Center

Service: Electrical EngineeringService: Electrical Preliminary StudiesService: Electrical Conceptual DesignIndustry: EducationIndustry: GovernmentType: MEP+20 more

WT Group AEC, LLC

Hoffman Estates, IL

Engineering with precision, pace and passion

WebsitePhone1 office6 leaders5 credentialsFounded 1971Updated Jun 2026

Service detail: Civil Engineering

Service: Civil EngineeringService: Structural EngineeringService: MEP EngineeringIndustry: CommercialIndustry: RetailType: Civil Engineering+18 more

Walker Consultants

Chicago, IL

Bringing Life to the Built Environment

Website26 offices4 publicationsFounded 1965Size Estimate: 500+ employeesUpdated Jun 2026

Service detail: Parking Design

Service: Parking DesignService: Functional DesignService: Architecture DesignIndustry: AviationIndustry: ResidentialType: Forensic Engineering+44 more

Webb Engineering Services, Inc.

St. Louis, MO

Webb Engineering Services (WES) is a mechanical, electrical, plumbing, and fire-protection engineering design firm founded in 1999 in St. Louis, Missouri. WES added plumbing and fire-protection disciplines to its original mechanical, electrical, and civil scope, and in 2018 acquired an engineering firm in Champaign, Illinois, doubling its size and establishing a second office in central and northern Illinois. WES serves public and private sector clients in healthcare, aviation, commercial, higher education, K-12, and governmental markets.

Website2 offices1 leadersFounded 1999Updated Jun 2026

Service detail: Electrical Engineering

Service: Electrical EngineeringService: Low/Medium Voltage Systems DesignService: Emergency System DesignIndustry: HealthcareIndustry: AviationType: Fire Protection Engineering+23 more

Weis Design Group

Ellisville, MO

Building Community

WebsitePhone3 offices3 leaders5 credentialsFounded 1969Updated Jun 2026

Service detail: Civil Engineering Design

Service: Civil Engineering DesignService: Roadway Design & EnhancementService: Stormwater ManagementIndustry: EducationIndustry: Sports & RecreationType: Civil Engineering+23 more

Willett, Hofmann & Associates, Inc.

Dixon, IL

Serving clients Ethically, Responsively and Professionally

WebsitePhone9 offices5 projects33 leaders16 credentialsFounded 1935

Project: Captain Swift Timber Covered Bridge

Service: Structural EngineeringService: Bridge DesignService: Bridge RatingsIndustry: Land DevelopmentIndustry: CommercialType: Architecture & Engineering+74 more

Wiss, Janney, Elstner Associates, Inc.

Northbrook, IL

Solutions for the Built World

WebsitePhone30 offices5 projects5 credentials5 publicationsFounded 1956

Project: Washington Monument

Service: Structural EngineeringService: Bridge EngineeringService: Heavy Movable StructuresIndustry: GovernmentIndustry: TransportationType: Architecture & Engineering+54 more

Wold Architects and Engineers

Minneapolis, MN

Wold Architects and Engineers is a full-service planning, architecture, and engineering firm committed to delivering exceptional design for education, healthcare, and government clients. With offices in Minnesota, Colorado, Illinois, Tennessee, and Indiana, Wold delivers architecture, engineering, interior design, facility master planning, and sustainability services to communities across the United States.

WebsitePhone7 offices4 projectsUpdated Jun 2026

Project: Bay Area Medical Center

Service: ArchitectureService: EngineeringService: Interior DesignIndustry: EducationIndustry: GovernmentType: Architecture & Engineering+5 more

Wolf Point Engineers & Contractors

Chicago, IL

Turnkey EPC Solutions for Bulk Material Handling Systems

WebsitePhone1 office6 projects2 credentialsUpdated Jun 2026

Project: Blue Creek Mine River Barge Load-Out Facility

Service: Bulk Material Handling EngineeringService: Overland Conveyor SystemsService: Pipe Conveyor SystemsIndustry: MiningIndustry: Power GenerationType: Structural Engineering+18 more

cGMP Consulting Inc.

Lake Forest, IL

Your cGMP Compliance and Engineering Partner

WebsitePhone1 office1 projects1 credentialsFounded 2001Size Estimate: 75-100 employees

Project: Pharmaceutical Facility Expansion

Service: Commissioning, Qualification, and Validation (CQV)Service: CommissioningService: Facilities, Utilities, and Equipment QualificationIndustry: Consumer ProductsIndustry: Food & BeverageType: Automation & Controls+25 more

dbHMS

Chicago, IL

Impact Through Engineering

Website7 offices2 projects1 leadersFounded 2002Updated Jun 2026

Project: The Keller Center, The University of Chicago

Service: Mechanical, Electrical, Plumbing & Fire Protection DesignService: Engineered HVAC SystemsService: Engineered Electrical SystemsIndustry: EducationIndustry: GovernmentType: MEP+45 more