# List of professional services firms in Oregon

Tamtam tracks 60 professional services firms headquartered in Oregon. This list ranks the 50 largest by number of employees on LinkedIn, led by ieSolutions, INDUSTRY and David Evans and Associates, Inc.. Their median headcount is 219. Half of them were founded in 2003 or later. The most common headquarters are Portland (33), Beaverton (4) and Eugene (2).

This selection of professional services firms in Oregon includes large companies, primarily based in Portland. These firms offer a range of specialized services, from IT consulting and engineering to legal and architectural design. Notable examples include ieSolutions, which provides IT staffing and consulting, and David Evans and Associates, Inc., a civil engineering firm. Stoel Rives LLP is a prominent law firm, while ZGF Architects focuses on sustainable architectural design.

The data shows a strong concentration of headquarters in Portland, indicating the city's role as a regional hub for professional services. The companies listed also span a wide founding era, from Stoel Rives LLP established in 1907 to more recent firms like INDUSTRY, founded in 2011, highlighting a mix of long-standing institutions and younger ventures.

🇺🇸 Oregon · 50 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [ieSolutions](https://www.tamtam.ai/c/iesolutions) (ie4solutions.com)<br>ieSolutions offers staffing services for IT projects and consulting services for planning, project management, system assessment, system delivery, and methodology implementation aligned with business priorities | IT Services and IT Consulting | 🇺🇸 Portland | 1,932 | 2002 |
| 2 | [INDUSTRY](https://www.tamtam.ai/c/industry) (industry.global)<br>A global brand consultancy specializing in defining white space, creating authentic storytelling, and bringing ideas to life with strategic creativity | Design Services | 🇺🇸 Portland | 1,457 | 2011 |
| 3 | [David Evans and Associates, Inc.](https://www.tamtam.ai/c/david-evans-and-associates-inc) (deainc.com)<br>A leader in progressive design solutions for transportation, land development, energy, and water projects nationwide, with a diverse team of professionals | Civil Engineering | 🇺🇸 Portland | 1,084 | 1976 |
| 4 | [Stoel Rives LLP](https://www.tamtam.ai/c/stoel-rives-llp) (stoel.com)<br>A leading US corporate and litigation law firm with over 325 attorneys offering services in energy, natural resources, compliance, counseling, deals, and disputes | Law Practice | 🇺🇸 Portland | 890 | 1907 |
| 5 | [ZGF Architects](https://www.tamtam.ai/c/zgf-architects) (zgf.com)<br>ZGF is a design firm rooted in Oregon, focusing on creating sustainable, community-oriented projects across North America with a humanistic approach | Architecture and Planning | 🇺🇸 Portland | 857 | 1942 |
| 6 | [Logical Position](https://www.tamtam.ai/c/logical-position) (logicalposition.com)<br>A top digital marketing agency offering PPC, SEO, website development, graphic design, social media marketing, data feed management, and more to grow businesses globally | Advertising Services | 🇺🇸 Lake Oswego | 840 | 2010 |
| 7 | [Prialto](https://www.tamtam.ai/c/prialto) (prialto.com)<br>Prialto offers subscription staffing for remote executive assistants, managing tasks like scheduling, email, travel, and CRM contact to amplify productivity | Staffing and Recruiting | 🇺🇸 Portland | 813 | 2008 |
| 8 | [Certified Languages International](https://www.tamtam.ai/c/certified-languages-international) (certifiedlanguages.com)<br>A language company offering on-demand interpreting services in over 230 languages, with professional interpreters available 24/7 and skilled in industry-specific terminology | Translation and Localization | 🇺🇸 Portland | 795 | 1996 |
| 9 | [PAE](https://www.tamtam.ai/c/pae-portland) (pae-engineers.com)<br>An engineering firm specializing in mechanical, electrical, and technology system design, with a focus on sustainability, regenerative engineering, and community impact | Architecture and Planning | 🇺🇸 Portland | 783 | 1967 |
| 10 | [Confident Staffing Inc](https://www.tamtam.ai/c/confident-staffing-inc) (confidentstaffing.com)<br>A staffing agency providing services in Oregon and Washington, specializing in various industries and positions including manufacturing, aviation, construction, and more Equal opportunity employer | Staffing and Recruiting | 🇺🇸 Medford | 739 | 2002 |
| 11 | [Hacker](https://www.tamtam.ai/c/hacker) (hackerarchitects.com)<br>A studio of architects creating spaces that connect us to the landscape, each other, and ourselves with honesty, sustainability, and beauty | Architecture and Planning | 🇺🇸 Portland | 689 | 1983 |
| 12 | [Otak](https://www.tamtam.ai/c/otak) (otak.com)<br>A Pacific Northwest-based company focused on urban growth planning, sustainable design, and transportation solutions, prioritizing community, diversity, and innovation | Design Services | 🇺🇸 Portland | 500 | 1981 |
| 13 | [Aldrich](https://www.tamtam.ai/c/aldrich) (aldrichadvisors.com)<br>Providing financial, wealth, tax, and business transition strategies for clients across the West Coast for over 50 years | Professional Services | 🇺🇸 Portland | 452 | 1973 |
| 14 | [Schwabe](https://www.tamtam.ai/c/schwabe) (schwabe.com)<br>Provides industry-focused legal services to clients from start-ups to Fortune 500 companies, offering ideas, advice, and exceptional legal counsel. | Law Practice | 🇺🇸 Portland | 431 |  |
| 15 | [Instrument](https://www.tamtam.ai/c/instrument) (instrument.com)<br>Digital-first design agency creating brands, products, websites, and campaigns through creative technology partnerships with ambitious global companies for over twenty years. | Marketing Services | 🇺🇸 Portland | 423 | 2005 |
| 16 | [Kittelson & Associates, Inc.](https://www.tamtam.ai/c/kittelson-and-associates-inc) (kittelson.com)<br>Solve complex transportation problems through planning, operations, design, and research to improve communities and everyday lives nationwide. | Civil Engineering | 🇺🇸 Portland | 420 | 1985 |
| 17 | [AKS Engineering & Forestry](https://www.tamtam.ai/c/aks-engineering-and-forestry) (aks-eng.com)<br>Consulting engineering firm offering civil engineering and complementary services in Oregon and SW Washington Specializing in public infrastructure and private development projects | Civil Engineering | 🇺🇸 Tualatin | 384 | 1996 |
| 18 | [Miller Nash LLP](https://www.tamtam.ai/c/miller-nash-llp) (millernash.com)<br>A leading law firm with over 150 years of success, providing industry-focused legal services in multiple states, prioritizing client satisfaction and innovative solutions | Law Practice | 🇺🇸 Portland | 376 | 1873 |
| 19 | [Mackenzie](https://www.tamtam.ai/c/mackenzie) (mackenzie.inc)<br>Leaders in design, committed to diversity, community, equity, sustainability Strong culture of friendship, resiliency, and creative problem-solving Over 60 years of experience | Professional Services | 🇺🇸 Portland | 368 | 1960 |
| 20 | [American Chase](https://www.tamtam.ai/c/american-chase) (americanchase.com)<br>A recruitment-centric talent acquisition company providing staffing services, IT solutions, and professional services to Fortune 500 clients across various industries | IT Services and IT Consulting | 🇺🇸 Portland | 348 | 2016 |
| 21 | [Quiktrak, LLC](https://www.tamtam.ai/c/quiktrak-llc) (quiktrak.com)<br>A global leader in inspection and verification services for the finance industry, offering floorplan auditing solutions and general inspection services worldwide | Financial Services | 🇺🇸 Beaverton | 323 | 1991 |
| 22 | [Cascade Energy](https://www.tamtam.ai/c/cascade-energy) (cascadeenergy.com)<br>Cascade Energy specializes in industrial energy efficiency solutions, offering program design, carbon tracking, engineering services, software, and training to help clients achieve sustainability goals | Professional Services | 🇺🇸 Portland | 313 | 1993 |
| 23 | [Oil and Gas Staffing, LLC](https://www.tamtam.ai/c/oil-and-gas-staffing-llc) (ogstaffing.net)<br>Petroleum Geologist and Engineer-owned recruiting agency specializing in oil and gas staffing for companies in the US and Canada Staffing professionals and entry-level laborers | Staffing and Recruiting | 🇺🇸 Bend | 307 | 2013 |
| 24 | [Centizen, Inc.](https://www.tamtam.ai/c/centizen-inc) (centizen.com)<br>A leading IT staffing and custom software development company offering innovative solutions, remote global hiring, and SaaS product development services | IT Services and IT Consulting | 🇺🇸 Beaverton | 251 | 2003 |
| 25 | [Ankrom Moisan](https://www.tamtam.ai/c/ankrom-moisan) (ankrommoisan.com)<br>Ankrom Moisan collaborates in architecture, interior design, urban planning, and brand identity to create impactful spaces across the West Coast | Design Services | 🇺🇸 Portland | 219 | 1983 |
| 26 | [Madden Industrial Craftsmen, Inc.](https://www.tamtam.ai/c/madden-industrial-craftsmen-inc) (mici.com)<br>A leading industrial staffing company in the Northwest, prioritizing lifelong customer relationships and rewarding employee skills and contributions | Staffing and Recruiting | 🇺🇸 Beaverton | 190 | 1988 |
| 27 | [Evergreen Engineering® Inc.](https://www.tamtam.ai/c/evergreen-engineering-inc) (evergreenengineering.com)<br>A company founded in 1985 offering industrial engineering, design, consulting, and construction solutions for various markets globally | Industrial Machinery Manufacturing | 🇺🇸 Eugene | 73 | 1985 |
| 28 | [Accordance Search Group](https://www.tamtam.ai/c/accordance-search-group) (accordancesearchgroup.com)<br>Connecting sales talent with companies. Specializing in recruiting and placing sales professionals, ensuring successful matches for hiring managers' needs. | Staffing and Recruiting | 🇺🇸 Portland | 58 | 2012 |
| 29 | [Alta Planning + Design](https://www.tamtam.ai/c/alta-planning-design) (altago.com)<br>Consulting firm specializing in bicycle, pedestrian, trail, park, greenway, and roadway planning, design, engineering, and outreach programs. | Professional Services | 🇺🇸 Portland | 51 | 1996 |
| 30 | [DPW Certified Public Accountants](https://www.tamtam.ai/c/dpw-certified-public-accountants) (dpwcpas.com)<br>A financial services firm providing tax preparation, planning, accounting, financial statements, 401K administration, consulting, CAAS, and NIL consulting for businesses and individuals | Accounting | 🇺🇸 Salem | 50 | 1981 |
| 31 | [LEVER Architecture](https://www.tamtam.ai/c/lever-architecture) (leverarchitecture.com)<br>Design-focused architecture firm in Portland and Los Angeles, emphasizing sustainability, innovation, and equity in creating buildings and environments that enhance the human experience | Architecture and Planning | 🇺🇸 Portland | 27 | 2009 |
| 32 | [Stillwater Energy](https://www.tamtam.ai/c/stillwater-energy) (stillwaterenergy.com)<br>A company founded to drive energy savings and a positive impact, focusing on sustainability, collaboration, and fearless innovation in all endeavors | Professional Training and Coaching | 🇺🇸 Portland | 26 | 2016 |
| 33 | [MADO](https://www.tamtam.ai/c/mado-portland) (lookwithmado.com)<br>A women-owned company in Portland delivering innovative research insights, strategic advisory, and foresight methods to inspire transformational innovation for clients | Research Services | 🇺🇸 Portland | 25 | 2018 |
| 34 | [The Good \| Digital Experience Optimization](https://www.tamtam.ai/c/the-good-digital-experience-optimization) (thegood.com)<br>Utilizing user insights, this company helps clients optimize digital platforms through data-driven testing, resulting in significant improvements | IT Services and IT Consulting | 🇺🇸 Portland | 24 | 2009 |
| 35 | [OmniData](https://www.tamtam.ai/c/omnidata) (freschesolutions.com)<br>Specializing in solution architecture, data engineering, and business intelligence, we partner with global companies to create quick solutions for complex data problems | IT Services and IT Consulting | 🇺🇸 Portland | 23 | 2019 |
| 36 | [Golsan Scruggs](https://www.tamtam.ai/c/golsan-scruggs) (golsanscruggs.com)<br>A specialized risk management consultant and corporate insurance brokerage firm offering Enterprise Risk Management services to commercial clients nationwide | Insurance | 🇺🇸 Portland | 23 | 2001 |
| 37 | [Sapient Law](https://www.tamtam.ai/c/sapient-law) (sapientlaw.com)<br>A unique full-service law firm providing tailored legal solutions for businesses, with experienced attorneys who prioritize client needs and communication | Law Practice | 🇺🇸 Portland | 18 | 2009 |
| 38 | [Mjh Investments](https://www.tamtam.ai/c/mjh-investments) (mjhgroup.com)<br>A private investment and management consulting firm offering services in direct investment and consulting, specializing in private investments | Financial Services | 🇺🇸 Salem | 13 |  |
| 39 | [Solarc Energy Group](https://www.tamtam.ai/c/solarc-energy-group) (solarcenergygroup.com)<br>A small firm offering energy efficiency analysis, commissioning, and mechanical engineering services with extensive experience in building energy conservation projects | Industrial Machinery Manufacturing | 🇺🇸 Eugene | 12 | 2015 |
| 40 | [S&C Consulting](https://www.tamtam.ai/c/s-and-c-consulting)<br>Global consulting firm providing AI-powered consultation for DevOps and IT teams, founded in 2016 by two partners | IT Services and IT Consulting | 🇺🇸 Remote | 11 | 2016 |
| 41 | [Future State Consulting](https://www.tamtam.ai/c/future-state-consulting) (launchconsulting.com)<br>Tech consulting firm delivering top engineering talent and team solutions with a personalized, relationship-first approach for digital mobility and technology goals | IT Services and IT Consulting | 🇺🇸 Tigard | 11 |  |
| 42 | [Range Financial Group](https://www.tamtam.ai/c/range-financial-group) (rangefinancialgroup.com)<br>A full-service financial firm specializing in financial planning, investment management, tax strategies, and tax return preparation for executives, business owners, and families | Financial Services | 🇺🇸 Tigard | 10 | 2017 |
| 43 | [Bridge City Legal](https://www.tamtam.ai/c/bridge-city-legal) (bridgecitylegal.com)<br>A premier west coast litigation consulting and document management company offering strategic, high-quality, and cost-effective solutions to corporations and law firms Services include data forensics, electronic discovery, trial presentation, and more | Legal Services | 🇺🇸 Portland | 9 | 1999 |
| 44 | [Compass IP Law PC](https://www.tamtam.ai/c/compass-ip-law-pc) (compassiplaw.com)<br>An intellectual property firm specializing in patent law, providing tailored quality work to help clients protect inventions domestically and internationally | Law Practice | 🇺🇸 Portland | 9 | 2014 |
| 45 | [Pepper Foster Consulting](https://www.tamtam.ai/c/pepper-foster-consulting) (pepperfoster.com)<br>A strategy and execution consulting firm helping clients in various industries figure things out and achieve impactful results through innovative solutions and great people | Business Consulting and Services | 🇺🇸 Portland | 9 | 2015 |
| 46 | [Rogue Consulting](https://www.tamtam.ai/c/rogue-consulting) (rogueventuresinc.com)<br>Business services firm specializing in transforming passions into plans, providing customized solutions and full implementation support to empower organizations for impact and change | Business Consulting and Services | 🇺🇸 Lake Oswego | 8 | 2017 |
| 47 | [TACC](https://www.tamtam.ai/c/tacc) (tacc-or.com)<br>A Central Oregon-based company offering creative technical solutions for businesses in the analytical instrument industry, focused on computing and marketing needs | Computer Networking Products | 🇺🇸 Redmond | 7 | 2017 |
| 48 | [M28 Global, Inc.](https://www.tamtam.ai/c/m28-global-inc) (m28global.com)<br>Specializing in addressing operational challenges through technology, data analytics, and process optimization with experts in business, technology, digital strategy, and design | Software Development | 🇺🇸 Portland | 7 | 2013 |
| 49 | [Endeavor45, LLC](https://www.tamtam.ai/c/endeavor45-llc) (endeavor45.com)<br>A consulting group in Portland, OR specializing in Medical Device commercialization, product development, business growth, marketing, branding, and creative services | Business Consulting and Services | 🇺🇸 Beaverton | 6 | 2017 |
| 50 | [Anchor Blue Consulting, LLC](https://www.tamtam.ai/c/anchor-blue-consulting-llc) (anchorbluellc.com)<br>Small energy consulting firm with expertise in energy efficiency, renewable energy, demand response, and evaluation services for utilities, government agencies, and non-profit clients | Business Consulting and Services | 🇺🇸 Portland | 5 | 2016 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

## More company lists in Oregon

- [The largest companies in Oregon](https://www.tamtam.ai/l/largest-companies-oregon) (1,086)
- [Retail chains in Oregon](https://www.tamtam.ai/l/retail-chains-oregon) (114)
- [Manufacturers in Oregon](https://www.tamtam.ai/l/manufacturers-oregon) (112)
- [Multinational companies in Oregon](https://www.tamtam.ai/l/multinational-companies-oregon) (97)
- [Education providers in Oregon](https://www.tamtam.ai/l/education-companies-oregon) (75)
- [Hardware manufacturers in Oregon](https://www.tamtam.ai/l/hardware-companies-oregon) (74)
- [Food and Beverage Services companies in Oregon](https://www.tamtam.ai/l/food-and-beverage-services-companies-oregon) (74)
- [Healthcare providers in Oregon](https://www.tamtam.ai/l/healthcare-providers-oregon) (72)
- [Companies with in-house R&D in Oregon](https://www.tamtam.ai/l/r-and-d-companies-oregon) (67)
- [Financial services firms in Oregon](https://www.tamtam.ai/l/financial-services-firms-oregon) (61)
- [Critical infrastructure operators in Oregon](https://www.tamtam.ai/l/critical-infrastructure-operators-oregon) (58)
- [Construction companies in Oregon](https://www.tamtam.ai/l/construction-companies-oregon) (58)
- [Public sector organisations in Oregon](https://www.tamtam.ai/l/public-sector-organisations-oregon) (58)
- [Family-owned companies in Oregon](https://www.tamtam.ai/l/family-owned-companies-oregon) (54)
- [Hospitals and Health Care companies in Oregon](https://www.tamtam.ai/l/hospitals-and-health-care-companies-oregon) (48)
- [Food and beverage companies in Oregon](https://www.tamtam.ai/l/food-and-beverage-companies-oregon) (47)
- [Distributors and wholesalers in Oregon](https://www.tamtam.ai/l/distributors-and-wholesalers-oregon) (42)
- [Hotel and hospitality groups in Oregon](https://www.tamtam.ai/l/hospitality-groups-oregon) (41)
- [Consulting firms in Oregon](https://www.tamtam.ai/l/consulting-firms-oregon) (40)
- [E-commerce companies in Oregon](https://www.tamtam.ai/l/ecommerce-companies-oregon) (40)
- [Government Administration companies in Oregon](https://www.tamtam.ai/l/government-administration-companies-oregon) (40)
- [Higher Education companies in Oregon](https://www.tamtam.ai/l/higher-education-companies-oregon) (39)
- [IT Services and IT Consulting companies in Oregon](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-oregon) (38)
- [Contract manufacturers in Oregon](https://www.tamtam.ai/l/contract-manufacturers-oregon) (34)

## The same list elsewhere in United States

- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,078)
- [Professional services firms in New York State](https://www.tamtam.ai/l/professional-services-firms-new-york-state) (955)
- [Professional services firms in California](https://www.tamtam.ai/l/professional-services-firms-california) (880)
- [Professional services firms in Texas](https://www.tamtam.ai/l/professional-services-firms-texas) (629)
- [Professional services firms in Florida](https://www.tamtam.ai/l/professional-services-firms-florida) (375)
- [Professional services firms in Virginia](https://www.tamtam.ai/l/professional-services-firms-virginia) (344)
- [Professional services firms in Illinois](https://www.tamtam.ai/l/professional-services-firms-illinois) (339)
- [Professional services firms in Massachusetts](https://www.tamtam.ai/l/professional-services-firms-massachusetts) (249)
- [Professional services firms in New Jersey](https://www.tamtam.ai/l/professional-services-firms-new-jersey) (249)
- [Professional services firms in Georgia](https://www.tamtam.ai/l/professional-services-firms-georgia) (246)
- [Professional services firms in Pennsylvania](https://www.tamtam.ai/l/professional-services-firms-pennsylvania) (245)
- [Professional services firms in Ohio](https://www.tamtam.ai/l/professional-services-firms-ohio) (195)
- [Professional services firms in Maryland](https://www.tamtam.ai/l/professional-services-firms-maryland) (176)
- [Professional services firms in Michigan](https://www.tamtam.ai/l/professional-services-firms-michigan) (172)
- [Professional services firms in Washington State](https://www.tamtam.ai/l/professional-services-firms-washington-state) (163)
- [Professional services firms in North Carolina](https://www.tamtam.ai/l/professional-services-firms-north-carolina) (142)
- [Professional services firms in Alabama](https://www.tamtam.ai/l/professional-services-firms-alabama) (135)
- [Professional services firms in Minnesota](https://www.tamtam.ai/l/professional-services-firms-minnesota) (125)
- [Professional services firms in New York](https://www.tamtam.ai/l/professional-services-firms-new-york) (735)
- [Professional services firms in Chicago](https://www.tamtam.ai/l/professional-services-firms-chicago) (196)
- [Professional services firms in Houston](https://www.tamtam.ai/l/professional-services-firms-houston) (156)
- [Professional services firms in Atlanta](https://www.tamtam.ai/l/professional-services-firms-atlanta) (143)
- [Professional services firms in San Francisco](https://www.tamtam.ai/l/professional-services-firms-san-francisco) (130)
- [Professional services firms in Washington](https://www.tamtam.ai/l/professional-services-firms-washington) (109)

---

Source: https://www.tamtam.ai/l/professional-services-firms-oregon