| Rank | Company | 2012 Government Revenue ($) |
| 1 | Fluor | $3,301,919,000 |
| 2 | URS Corp. | $693,536,105 |
| 3 | AECOM Technology Corp. | $522,390,000 |
| 4 | Jacobs Engineering Group | $422,670,000 |
| 5 | STV | $196,225,000 |
| 6 | Michael Baker Jr. | $109,360,000 |
| 7 | Science Applications International Corp. | $66,429,538 |
| 8 | Parsons Brinckerhoff | $56,438,739 |
| 9 | Merrick & Co. | $54,500,000 |
| 10 | H&A Architects & Engineers | $40,736,471 |
| 11 | Burns & McDonnell | $39,650,000 |
| 12 | Clark Nexsen | $36,047,902 |
| 13 | Arup | $31,337,694 |
| 14 | Allen & Shariff | $28,205,000 |
| 15 | Dewberry | $26,366,107 |
| 16 | Eaton Energy Solutions | $21,042,636 |
| 17 | Smith Seckman Reid | $19,741,666 |
| 18 | Simpson Gumpertz & Heger | $19,300,000 |
| 19 | Affiliated Engineers | $16,707,000 |
| 20 | Guernsey | $13,137,397 |
| 21 | Barge, Waggoner, Sumner and Cannon | $12,200,000 |
| 22 | Syska Hennessy Group | $11,919,278 |
| 23 | Coffman Engineers | $11,189,000 |
| 24 | RMF Engineering Design | $9,625,000 |
| 25 | Walker Parking Consultants | $9,000,000 |
| 25 | KPFF Consulting Engineers | $9,000,000 |
| 25 | Rolf Jensen & Associates | $9,000,000 |
| 28 | WSP USA | $8,500,000 |
| 29 | BRPH | $8,230,500 |
| 30 | Shive-Hattery | $7,887,925 |
| 31 | Bridgers & Paxton Consulting Engineers | $7,642,938 |
| 32 | Wiss, Janney, Elstner Associates | $7,573,000 |
| 33 | SSOE Group | $5,961,076 |
| 34 | TTG | $5,857,540 |
| 35 | Vanderweil Engineers | $5,707,000 |
| 36 | TLC Engineering for Architecture | $5,573,256 |
| 37 | Newcomb & Boyd | $5,548,078 |
| 38 | KCI Technologies | $5,500,000 |
| 39 | Walter P Moore | $5,411,370 |
| 40 | Ross & Baruzzini | $5,396,261 |
| 41 | Heapy Engineering | $5,063,419 |
| 42 | KJWW Engineering Consultants | $4,859,400 |
| 43 | GHT Limited | $4,750,000 |
| 44 | Degenkolb Engineers | $4,517,695 |
| 45 | Bard, Rao + Athanas Consulting Engineers | $4,500,000 |
| 46 | Glumac | $4,490,000 |
| 47 | Sparling | $4,464,265 |
| 48 | Interface Engineering | $4,363,221 |
| 49 | RDK Engineers | $4,197,000 |
| 50 | Aon Fire Protection Engineering | $4,100,000 |
| 51 | Thornton Tomasetti | $4,020,020 |
| 52 | CCRD Partners | $4,000,000 |
| 53 | Spectrum Engineers | $3,443,455 |
| 54 | M/E Engineering | $3,403,050 |
| 55 | GRW | $3,385,623 |
| 56 | H.F. Lenz | $3,295,000 |
| 57 | GRAEF | $3,113,082 |
| 58 | French & Parrello Associates | $3,100,000 |
| 59 | Henderson Engineers | $2,266,357 |
| 60 | Apogee Consulting Group | $2,121,000 |
| 61 | Haynes Whaley Associates | $2,041,785 |
| 62 | Bergmann Associates | $2,010,000 |
| 63 | Davis, Bowen & Friedel | $1,833,731 |
| 64 | Brinjac Engineering | $1,707,652 |
| 65 | M-E Engineers | $1,630,000 |
| 66 | AKF Group | $1,236,900 |
| 67 | Paulus, Sokolowski and Sartor | $1,150,000 |
| 67 | Dunham Associates | $1,150,000 |
| 69 | Buro Happold Consulting Engineers | $1,030,000 |
| 70 | Primera Engineers | $925,000 |
| 71 | Middough | $850,000 |
| 72 | Environmental Systems Design | $836,185 |
| 73 | CTLGroup | $800,000 |
| 74 | ThermalTech Engineering | $625,000 |
| 75 | Peter Basso Associates | $500,000 |
| 76 | Zak Companies | $443,642 |
| 77 | Mazzetti | $432,838 |
| 78 | CJL Engineering | $358,000 |
| 79 | OLA Consulting Engineers | $300,000 |
| 80 | Rist-Frost-Shumway Engineering | $250,000 |
| 81 | KLH Engineers | $228,505 |
| 82 | Wick Fisher White | $213,850 |
| 83 | Wallace Engineering | $200,000 |
| 84 | G&W Engineering | $170,000 |
| 85 | Total Building Commissioning | $154,396 |
| 86 | P2S Engineering | $59,268 |
| 87 | FBA Engineering | $50,000 |
| 88 | Kamm Consulting | $27,425 |
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