Companies are ranked according to revenue for design services performed in 2007 in $ millions (*). Those with subsidiaries are indicated by (†). Firms not ranked last year are designated **. Some markets may not add up to 100% due to omission of "other" miscellaneous market category and rounding. NA=Not available.

Key to type of Firm: A=architect; E=engineer; EC=engineer-contractor; AE=architect-engineer; EA=engineer-architect; ENV=environmental; GE=geotechnical engineer; L=landscape architect; P=planner; O=other. Other combinations possible. Firms classified themselves.

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Click below for more 2015 Top Design Firms Sectors:
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Landscape Architecture

Rank	Firm	$ Mil.
1	AECOM	10.07
2	SmithGroupJJR	3.50
3	Kimley-Horn	2.40
4	Civil & Environmental Consultants Inc.	1.88
5	Langan Environmental & Engineering Services	1.82
6	Stantec	1.50
7	Whitman, Requardt & Associates LLP	1.15
8	STV	1.11
9	Design Collective Inc.	1.10
10	Ayers Saint Gross	1.04

Surveying and Mapping

Rank	Firm	$ Mil.
1	Dewberry	25.57
2	SAI Consulting Engineers Inc.	16.00
3	The Thrasher Group Inc.	11.89
4	Cardno	10.87
5	Michael Baker international	10.56
6	KCI Technologies Inc.	8.30
7	Atkins North America	7.64
8	GAI Consultants Inc.	7.37
9	PVE Sheffler LLC	6.51
10	Timmons Group	5.87
11	Draper Aden Associates Inc.	4.79
12	Whitman, Requardt & Associates LLP	4.66
13	Hatch Mott MacDonald	4.65
14	Gannett Fleming	4.39
15	STV	3.34
16	Whitney, Bailey, Cox & Magnani LLC	3.01
17	Stantec	2.88
18	Rummel, Klepper & Kahl LLP	2.00
19	Herbert, Rowland & Grubic Inc.	1.47
20	Wallace Montgomery	1.13

Structural Engineering

Rank	Firm	$ Mil.
1	AECOM	67.78
2	WSP | Parsons Brinckerhoff	45.77
3	HNTB Corp.	24.01
4	Gannett Fleming	20.55
5	Michael Baker international	19.86
6	Modjeski and Masters Inc.	19.84
7	STV	17.83
8	Whitman, Requardt & Associates LLP	14.55
9	Stantec	13.41
10	Rummel, Klepper & Kahl LLP	10.50
11	KCI Technologies Inc.	7.40
12	EwingCole	5.10
13	Collins Engineers Inc.	4.73
14	GAI Consultants Inc.	4.18
15	Wallace Montgomery	3.97
16	Alfred Benesch & Co.	3.87
17	McCormick Taylor Inc.	3.70
18	Wiss, Janney, Elstner Associates Inc.	3.33
19	Whitney, Bailey, Cox & Magnani LLC	3.13
20	Clark Nexsen	2.80
21	Advantage Engineers LLC	2.58
22	Cardno	2.29
23	Dewberry	1.64
24	Traffic Planning and Design Inc.	1.63
25	Herbert, Rowland & Grubic Inc.	1.61

Environmental & Geotechnical Engineering

Rank	Firm	$ Mil.
1	ARCADIS/RTKL/Callison	85.27
2	ECS Mid-Atlantic LLC	72.13
3	Michael Baker international	44.59
4	AECOM	42.68
5	GAI Consultants Inc.	41.87
6	Whitman, Requardt & Associates LLP	38.30
7	Gannett Fleming	38.19
8	Cardno	33.17
9	Stantec	32.96
10	KCI Technologies Inc.	30.10
11	McCormick Taylor Inc.	18.70
12	Skelly and Loy Inc.	16.32
13	Civil & Environmental Consultants Inc.	16.25
14	Langan Environmental & Engineering Services	11.50
15	Buchart Horn Inc./BASCO Associates	9.22
16	WSP | Parsons Brinckerhoff	8.64
17	Draper Aden Associates Inc.	6.99
18	PEER Consultants	6.74
19	STV	6.69
20	Hatch Mott MacDonald	6.27
21	Advantage Engineers LLC	5.16
22	Timmons Group	2.93
23	Alfred Benesch & Co.	2.42
24	Whitney, Bailey, Cox & Magnani LLC	1.84
25	The Thrasher Group Inc.	1.48

Architecture

Rank	Firm	$ Mil.
1	Gensler	65.72
2	AECOM	54.42
3	SmithGroupJJR	33.29
4	EwingCole	30.01
5	Shalom Baranes Associates	27.46
6	ARCADIS/RTKL/Callison	27.01
7	Ayers Saint Gross	26.70
8	Page	26.28
9	Grimm + Parker Architects	24.49
10	Stantec	20.04
11	Clark Nexsen	16.26
12	Design Collective Inc.	16.00
13	Crabtree, Rohrbaugh & Associates	14.64
14	Perkins+Will	13.97
15	GWWO Inc./Architects	13.73
16	WDG Architecture	13.56
17	Michael Baker international	12.62
18	Cooper Carry Inc.	12.23
19	Perkins Eastman	7.96
20	Dewberry	7.37