# Top 30 professional services firms in Portland

Tamtam tracks 48 professional services firms headquartered in Portland. This list ranks the 30 largest by number of employees on LinkedIn, led by ieSolutions, INDUSTRY and Woodard & Curran. Their median headcount is 423. Half of them were founded in 1985 or later.

This selection of professional services firms in Portland includes a mix of established companies and those founded in the early 2000s. The sector is notably diverse, encompassing IT services, design, environmental consulting, civil engineering, and legal practices. Many of these firms, such as Woodard & Curran and David Evans and Associates, Inc., focus on engineering and environmental solutions, indicating a strong regional presence in infrastructure and sustainability.

Key companies include ieSolutions, which provides IT staffing and consulting; INDUSTRY, a global brand consultancy; BerryDunn, offering assurance, tax, and consulting services; and Stoel Rives LLP, a corporate and litigation law firm. A common thread among these firms is their headquarters in Portland, highlighting the city as a hub for professional services across various specializations.

🇺🇸 Portland · 30 companies · Updated Nov 12, 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 | [Woodard & Curran](https://www.tamtam.ai/c/woodard-and-curran) (woodardcurran.com)<br>Integrated firm specializing in water and environmental projects, offering tailored solutions through science, engineering, design-build, operations, and collaborative partnerships with clients | Environmental Services | 🇺🇸 Portland | 1,148 | 1979 |
| 4 | [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 |
| 5 | [BerryDunn — Assurance, Tax and Consulting](https://www.tamtam.ai/c/berrydunn-assurance-tax-and-consulting) (berrydunn.com)<br>A nationally recognized firm providing assurance, tax, and consulting services to help clients create, grow, and protect value with exceptional service | Accounting | 🇺🇸 Portland | 1,049 | 1974 |
| 6 | [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 |
| 7 | [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 |
| 8 | [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 |
| 9 | [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 |
| 10 | [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 |
| 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 | [Tilson](https://www.tamtam.ai/c/tilson) (tilsontech.com)<br>A multi-specialty telecommunications services firm with over 25 years of experience building and maintaining information infrastructure for various clients nationwide | Telecommunications | 🇺🇸 Portland | 422 | 1996 |
| 17 | [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 |
| 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 | [Pierce Atwood LLP](https://www.tamtam.ai/c/pierce-atwood-llp) (pierceatwood.com)<br>A full-service law firm based in New England with 150 attorneys serving regional, national, and international clients in various industries | Law Practice | 🇺🇸 Portland | 324 | 1891 |
| 22 | [Baker Newman Noyes](https://www.tamtam.ai/c/baker-newman-noyes) (bnncpa.com)<br>One of the top 100 accounting and consulting firms, specializing in banking, healthcare, manufacturing, not-for-profit, public sector, and family-owned businesses | Accounting | 🇺🇸 Portland | 321 | 1995 |
| 23 | [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 |
| 24 | [Stone Coast Fund Services](https://www.tamtam.ai/c/stone-coast-fund-services) (stone-coast.com)<br>Professional services firm in Maine and Cayman Islands providing independent fund administration services to onshore and offshore hedge funds globally | Financial Services | 🇺🇸 Portland | 234 | 2006 |
| 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 | [Drummond Woodsum](https://www.tamtam.ai/c/drummond-woodsum) (dwmlaw.com)<br>Full-service law firm with over 100 attorneys offering a wide range of legal services to corporations, financial institutions, tribal nations, municipalities, and individuals | Law Practice | 🇺🇸 Portland | 186 | 1965 |
| 27 | [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 |
| 28 | [S&F Land Services](https://www.tamtam.ai/c/s-and-f-land-services) (sflands.com)<br>Provides land surveying and remote sensing services, including imagery and LiDAR, to engineers, project owners, representatives, and public infrastructure agencies across the Western United States. | Surveying and Mapping Services | 🇺🇸 Portland | 51 | 2016 |
| 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 | [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 |

## 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 12, 2026.

## More company lists in Portland

- [The largest companies in Portland](https://www.tamtam.ai/l/largest-companies-portland) (523)
- [Retail chains in Portland](https://www.tamtam.ai/l/retail-chains-portland) (58)
- [Manufacturers in Portland](https://www.tamtam.ai/l/manufacturers-portland) (42)
- [Financial services firms in Portland](https://www.tamtam.ai/l/financial-services-firms-portland) (37)
- [Multinational companies in Portland](https://www.tamtam.ai/l/multinational-companies-portland) (37)
- [Food and Beverage Services companies in Portland](https://www.tamtam.ai/l/food-and-beverage-services-companies-portland) (34)
- [Education providers in Portland](https://www.tamtam.ai/l/education-companies-portland) (30)
- [Healthcare providers in Portland](https://www.tamtam.ai/l/healthcare-providers-portland) (30)
- [Consulting firms in Portland](https://www.tamtam.ai/l/consulting-firms-portland) (28)
- [Construction companies in Portland](https://www.tamtam.ai/l/construction-companies-portland) (28)
- [E-commerce companies in Portland](https://www.tamtam.ai/l/ecommerce-companies-portland) (25)

## The same list elsewhere in United States

- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,079)
- [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) (173)
- [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) (136)
- [Professional services firms in Minnesota](https://www.tamtam.ai/l/professional-services-firms-minnesota) (124)
- [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)

## The same list elsewhere

- [Professional services firms in the world](https://www.tamtam.ai/l/professional-services-firms-in-the-world) (24,737)

---

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