Company lists · Data refreshed September 2026

Top 25 Master planning firms based in Seattle, United States

Name: Master planning firms based in Seattle, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 64 companies tracked

RevenueBase identified 64 master planning firms headquartered in Seattle, United States as of September 2026 and tracks 1,334 professional contacts across them, including 710 with verified work emails. New York is the largest hub.

This list covers master planning firms headquartered in Seattle, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 20, 2026 86% judged on-target in blind review

64Companies

1,334Contacts tracked

710Verified emails

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The 25 largest master planning firms based in Seattle, United States

Ranked by team size

Top 25 of 64 master planning firms based in Seattle, United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to master planning firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Mithun	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	51-200	287 contacts →
	Indirect evidence “Mithun is an integrated design firm dedicated to creating positive change in people’s lives.” Source: RevenueBase Database · checked Sep 20, 2026
2	LMN Architects	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	51-200	170 contacts →
	Partial evidence “About LMN Architects Seattle-based LMN Architects specializes in the planning and design of significant public and private facilities, including convention centers, cultural arts…” Source: RevenueBase Database · checked Sep 20, 2026
3	Gglo Design	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	115 contacts →
	Partial evidence “GGLO is an integrated design firm that provides architecture, urban design, planning, research, interior design, and landscape architecture to clients around the world.” Source: RevenueBase Database · checked Sep 20, 2026
4	Hewitt	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	51-200	111 contacts →
	Indirect evidence “HEWITT is an integrated practice of architects, landscape architects and urban designers, committed to creating value for clients and community - meaningful places that connect…” Source: RevenueBase Database · checked Sep 20, 2026
5	The Miller Hull Partnership, LLP	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	51-200	104 contacts →
	Partial evidence “The Miller Hull Partnership is an architecture and planning firm rooted in environmentally-responsible designs that create a regenerative and inclusive future.” Source: RevenueBase Database · checked Sep 20, 2026
6	Collinswoerman	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	51-200	61 contacts →
	Indirect evidence “We believe that great design drives extraordinary value.” Source: RevenueBase Database · checked Sep 20, 2026
7	Board & Vellum	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	37 contacts →
	Indirect evidence “Board & Vellum is a multidisciplinary design firm based on Capitol Hill in Seattle, offering architecture, interior design, and landscape architecture for residential, commercial…” Source: RevenueBase Database · checked Sep 20, 2026
8	HBB Landscape Architecture	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	34 contacts →
	Partial evidence “HBB is a 20 person professional Landscape Architecture, Urban Design, and Planning firm located in Downtown Seattle.” Source: RevenueBase Database · checked Sep 20, 2026
9	Johnston Architects	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	30 contacts →
	Indirect evidence “Johnston Architects was born from a desire to create exceptional architecture through intelligent, conscientious, and sustainable design.” Source: RevenueBase Database · checked Sep 20, 2026
10	MIG SVR	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	201-500	29 contacts →
	Indirect evidence “SvR Design Company was founded in 1989 with a mission of providing innovation in the built environment.” Source: RevenueBase Database · checked Sep 20, 2026
11	Weinstein A U	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	26 contacts →
	Indirect evidence “At Weinstein AU, we look for ways to make our complex world a more balanced, inspirational, and productive place in which to live, work, and participate in civic life.” Source: RevenueBase Database · checked Sep 20, 2026
12	Tiscareno	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	25 contacts →
	Indirect evidence “Tiscareno is a diverse, mid-size team of architects, designers, project managers, and support staff that designs multifamily, mixed-use, tenant improvement, transportation, and…” Source: RevenueBase Database · checked Sep 20, 2026
13	Jackson Main Architecture, P.S	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	24 contacts →
	Partial evidence “Jackson \| Main Architecture is a full-service architecture and planning firm designing what’s next in the built environment.” Source: RevenueBase Database · checked Sep 20, 2026
14	Urbal Architecture	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	20 contacts →
	Indirect evidence “Urbal Architecture, PLLC was founded in 2010 and has grown to medium sized, award-winning architecture firm located in Seattle’s Eastlake neighborhood, and Portland.” Source: RevenueBase Database · checked Sep 20, 2026
15	Pacland	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	1-10	20 contacts →
	Indirect evidence “Founded in 1994, PACLAND is recognized as a leading site development consulting/engineering firm based in Seattle and serving the western US.” Source: RevenueBase Database · checked Sep 20, 2026
16	Uncommon Bridges	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence “Uncommon Bridges builds more vibrant, just, and thriving communities by braiding inclusive process, consensus leadership, impactful organizations, and meaningful places into…” Source: RevenueBase Database · checked Sep 20, 2026
17	Cast Architecture	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “CAST architecture is a Seattle-based firm with extensive experience designing contemporary spaces throughout the Northwest.” Source: RevenueBase Database · checked Sep 20, 2026
18	J.A. Brennan Associates, Pllc	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	1-10	14 contacts →
	Indirect evidence “The professionals at J.A.” Source: RevenueBase Database · checked Sep 20, 2026
19	GCH Planning And Landscape Architecture	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	10 contacts →
	Partial evidence “Geyer Coburn Hutchins (GCH) is a world class landscape architectural and land planning firm made up of professionals with diverse and complementary backgrounds.” Source: RevenueBase Database · checked Sep 20, 2026
20	Caron Architecture	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	11-50	9 contacts →
	Indirect evidence “Caron is a full-service architecture firm that provides simple, elegant designs for a wide variety of national and international clients.” Source: RevenueBase Database · checked Sep 20, 2026
21	Motionspace Architecture Design Pllc	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	1-10	9 contacts →
	Indirect evidence “Motionspace Architecture + Design PLLC is an Award Winning Seattle Architecture Firm.” Source: RevenueBase Database · checked Sep 20, 2026
22	Blueline	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	51-200	7 contacts →
	Indirect evidence “A vital component of Blueline's success is the staff - a select group of creative, talented and dedicated individuals who bring significant and varied professional experience, an…” Source: RevenueBase Database · checked Sep 20, 2026
23	Allied8	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	1-10	6 contacts →
	Partial evidence “Allied8 is a values-based architecture and planning firm designing and advocating for urban development that supports environmental health, social and economic equity, and…” Source: RevenueBase Database · checked Sep 20, 2026
24	Johnson Oaklief Architecture & Planning, LLC	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	1-10	6 contacts →
	Partial evidence “Johnson Oaklief Architecture & Planning began with and continues to focus on the firms architectural practice of urban design and development, the design and planning of mixed-use…” Source: RevenueBase Database · checked Sep 20, 2026
25	Build LLC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	1-10	6 contacts →
	Indirect evidence “BUILD is a multi-disciplinary architectural design firm with a diverse portfolio of work that demonstrates elegance, integrity and simplification of the complex.” Source: RevenueBase Database · checked Sep 20, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: master planning firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names master planning firms.
Partial evidence: Its own public description names part of master planning firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name master planning firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 64 master planning firms based in Seattle, United States

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Master planning firms based in Seattle, United States at a glance

As of Sep 20, 2026

53.2%Verified-email coverage

20.8Average contacts per company

1-10Median size (employees)

265.6%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than for Seattle, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 64 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among master planning firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Seattle, United States whose own description of what they do matches “master planning firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names master planning firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among master planning firms, and records with no verified work email. Companies headquartered outside Seattle are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 710 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Master planning firms by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names master planning firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many master planning firms are there based in Seattle, United States?

RevenueBase identified 64 master planning firms headquartered in Seattle, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Mithun, headquartered in Seattle, tops this list with the largest team on record.

Which city has the most master planning firms?

New York leads with 170 headquartered companies, followed by Los Angeles (75) and Houston (71).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 710 verified decision-maker contacts tracked across these 64 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.