Browse by Builder
(Companies, Contractors, Engineers, etc.)
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- A -- A & P Roberts Co. of Pencoyd, Pennsylvania (25)
- A Teichert & Sons Inc of Sacramento, California (1)
- A&L Construction Co. of Hattiesburg, Mississippi (1)
- A. A. Lewis (1)
- A. B. Carson of Bryan, Texas (1)
- A. Bentley & Sons Co. of Jacksonville, Florida (1)
- A. Buchanan of Chambersburg, Pennsylvania (1)
- A. Calhoun (1)
- A. Fisher (1)
- A. G. Proctor (1)
- A. Guthrie & Co. of St. Paul, Minnesota (8)
- A. Hunter (1)
- A. J. Watson (1)
- A. K. Nicolaysen (2)
- A. K. Zeigler (1)
- A. L. Dolby & Co. (2)
- A. L. Finney (1)
- A. L. Kiefer (1)
- A. Lucius (1)
- A. Martini & Co. (1)
- A. Morton Thomas & Associates of Rockville, Maryland (1)
- A. Munster (1)
- A. Olson Construction Co. of Waterloo, Iowa (2)
- A. Phimister Proctor (2)
- A. S. Decker (1)
- A. S. Wikstrom, Inc. of Skaneateles, New York (1)
- A. Smolkant (1)
- A. W. Quist (1)
- A. W. Schimberg (3)
- A. W. Swallows (1)
- A.A. Alsbury & Co. (1)
- A.A. Davis Construction Co. (1)
- A.A. McLean (1)
- A.A. Mundy of Austin, Texas (1)
- A.B. Gindley (1)
- A.C. Bell (1)
- A.C. Boyle & Co. of McGregor, Iowa (3)
- A.C. Georig (1)
- A.C. Shand (3)
- A.C. Shard (1)
- A.C. Striker (4)
- A.D. Bishop (10)
- A.D. Bottomfield (1)
- A.D. Briggs & Co. of Springfield, Massachusetts (1)
- A.D. Case (1)
- A.D. Kern (2)
- A.D. O'Brien of Wilmington, North Carolina (1)
- A.D. Stoyer of Shillington, Pennsylvania (1)
- A.E. Button (1)
- A.E. Guidane (1)
- A.E. Shorthill Co. (2)
- A.E. Suleski (1)
- A.E. Tilseth (1)
- A.F. Lewis of Wellsville, Kansas (1)
- A.F. Robinson of Chicago, Illinois (1)
- A.G. Bennett (1)
- A.G. Needs (1)
- A.G. Ryan & Sons (1)
- A.H. Austin of Webster City, Iowa (6)
- A.H. Kile of Muscatine, Iowa (1)
- A.H. Proksch (1)
- A.J. Cason (1)
- A.J. Cheff Construction Co. (1)
- A.J. Friemoth (1)
- A.J. Himes (1)
- A.J. Lockhart (1)
- A.J. Nading of Clayton County, Iowa (1)
- A.J. Tullock of Leavenworth, Kansas (13)
- A.J. Yawger Co. of Indianapolis, Indiana (1)
- A.L. Greenberg Iron Co. (1)
- A.M. Blodgett of Kansas City, Missouri (23)
- A.M. Kennedy & Sons (9)
- A.M. Lupfer (1)
- A.M.(Archibald) Kennedy (1)
- A.P. Dise (3)
- A.P. Poirot Construction Co. of Belleville, Illinois (3)
- A.S. Cheever (1)
- A.S. Hecker (1)
- A.S. Leonard (1)
- A.S. Miller & Sons of Eugene, Oregon (1)
- A.S. Seybert (1)
- A.S.Miller (1)
- A.T. Nelson of Duluth, Minnesota (1)
- A.V. Sims of Iowa City, Iowa (1)
- A.V. Spah (1)
- A.W. Grosvenor (4)
- A.W. Merrick of Boone, Iowa (1)
- A.Y. Bayne & Co. of Minneapolis, Minnesota (7)
- ABKJ Inc. of Seattle, Washington & Bangalore/Bengaluru, Karnataka, Republic of India (2)
- AECOM of Los Angeles. California (3)
- APAC of Kansas City, Kansas (1)
- ARUP of London, England, United Kingdom (1)
- Aaron Wolf (1)
- Aaron Wright (1)
- Aberthaw Construction Co. of Boston, Massachusetts (3)
- Abraham Owen (1)
- Acrow Corporation of America of Parsippany, New Jersey (8)
- Adain Bros. (1)
- Adam Oscar Martin of Doylestown, Pennsylvania (14)
- Adams Construction Co. (1)
- Addison Conner (1)
- Adolph Green Construction Co. (1)
- Adolph Strauch (2)
- Advance Construction Co. of Waukesha, Wisconsin. (2)
- Aetna Bridge (1)
- Ainsworth L. Powell of Postville, Iowa (1)
- Alabama Dry Dock & Shipbuilding Co. of Mobile, Alabama (1)
- Alabama Road Commission (1)
- Alamo Construction Co. of San Antonio, Texas (2)
- Alan Jenkins (1)
- Albany Bridge Co. (1)
- Alberici Constructors of St. Louis, Missouri (1)
- Albert A. Robinson of South Reading, Vermont (1)
- Albert Anderson (1)
- Albert B.Hash (1)
- Albert Fink of Lauterbach, Hesse, Germany (6)
- Albert G. Plagens (1)
- Albert G. Wishon (1)
- Albert H. Hawman (1)
- Albert Lucius of New York City, New York (3)
- Albert Lyons (1)
- Albina Engine & Machine Works of Portland, Oregon (1)
- Albinson Construction Co. (1)
- Alcoa of Pittsburgh, Pennsylvania (1)
- Alden & Lassig Bridge & Iron Works of Chicago, Illinois (4)
- Alesghem & Sons Rope Co. (1)
- Alex Findlay & Co. of Motherwell, North Lanarkshire, Scotland, United Kingdom (1)
- Alexander & Charles Provost (1)
- Alexander & Higby of Des Moines, Iowa (1)
- Alexander Birnie (5)
- Alexander Briggs (3)
- Alexander C. Shand (1)
- Alexander Campbell (1)
- Alexander H. Nelson (1)
- Alexander Murdoch (1)
- Alexander von Babo (4)
- Alexis French (1)
- Alfred Cook & James Allen (2)
- Alfred D. Butler (3)
- Alfred Eichler (1)
- Alfred M. Pelgate (1)
- Alfred Noble of Stockholm, Sweden (2)
- Alfred Olsen (1)
- Alfred P. Boller of Philadelphia, Pennsylvania (8)
- Alfred S. Clark (1)
- Alfred Vinall of Davenport, Iowa (2)
- Alfredo C. Janni (1)
- All-Steel Equipment Co. (1)
- Allan A. Myers, Inc. of Malvern, Pennsylvania (1)
- Allen & Fulton of Topeka, Kansas (2)
- Allen, McEvoy & Co. of Beloit, Wisconsin (2)
- Allentown Bridge Co. of Allentown, Pennsylvania (1)
- Allied Structural Steel Co. of Chicago, Illinois (3)
- Allston Dana (1)
- Alonzo Livermore (2)
- Alphonse Fteley (1)
- Alphonse Halter (1)
- Alpine Construction (7)
- Altman-Rogers Co. of Oklahoma City, Oklahoma (2)
- Alton-St. Louis Bridge Co (1)
- Alvah Hopson (1)
- Alvin John Stewart (1)
- Amasa Stone (1)
- Ambrose R. West (1)
- Ambrose-Burdsall Co. (1)
- Ambursen Construction Co. (1)
- AmerCom Corp. of Parsippany, New Jersey (1)
- American Bridge & Iron Co. of Roanoke, Virginia (2)
- American Bridge Co. of New York (1,079)
- American Bridge Works of Chicago, Illinois (22)
- American Civil Constructors of Littleton, Colorado (1)
- American Coal Co., and Maryland Coal Co. (1)
- American Concrete Co. (1)
- American Construction Co. of Chicago, Illinois/Dallas, Texas/Houston, Texas (2)
- American Consulting Engineers of Lexington, Kentucky (1)
- American Paving & Construction Co. (1)
- American Steel & Wire Co. (1)
- Ames Construction Inc. (1)
- Amis Construction Co. of Oklahoma City, Oklahoma (2)
- Ammann & Whitney of New York City, New York (2)
- Amos J. Peters of Longview, Washington (1)
- Amos McLouth of Monroe County, Michigan (1)
- Amos Melberg of Cedar Rapids, Iowa (1)
- Andersen Construction Co. of Portland, Oregon (1)
- Anderson & Barr (1)
- Anderson. Vernard (1)
- Andreas Wendslbo Munster of Bergen, Hordaland, Norway (2)
- Andrew Canzanelli (1)
- Andrew Clouser (1)
- Andrew J. Potter (1)
- Andrew L. Ramsour of Hickory, North Carolina (1)
- Andrew Weston Co. of Rouses Point, New York (1)
- Angeles Gravel & Supply Co. of Port Angeles, Washington (2)
- Angelito DelaCruz (1)
- Angus Ferguson (1)
- Anson Jenkins (1)
- Anton Kiefer of Germany (1)
- Appears to be of WPA vintage. (1)
- Appleby-Frodingham Steel Co. of Scunthorpe, North Lincolnshire, England, United Kingdom (1)
- Appleton & Davis (1)
- Applied EarthWorks, Inc. of Fresno, California (1)
- Arad Copeland (1)
- Archibald Stuart Baldwin of Winchester, Virginia (1)
- Ardell Slattum (1)
- Arkansas Bridge & Steel Co. (1)
- Arkansas Bridge Co. of Kansas City, Kansas (1)
- Arkansas General Construction Co. of Little Rock, Arkansas (1)
- Arkansas Highway Department (2)
- Armour Townsend Granger of Austin, Texas (1)
- Armstrong & Sons (1)
- Armstrong Co. of Chicago, Illinois (1)
- Army Corps of Engineers (1)
- Arnold M Graton Associates Inc of Ashland, New Hampshire (11)
- Arnold W. Brunner of New York City, New York (1)
- Art Gates (1)
- Arthur B. Paine (1)
- Arthur C. Adams (2)
- Arthur C. Hall (1)
- Arthur De Wint Foote (2)
- Arthur Dyer (1)
- Arthur G. Hayden (1)
- Arthur G. Leake & Co. (1)
- Arthur I. Perry (1)
- Arthur Jordan (4)
- Arthur L. Kiefer (1)
- Arthur McMullen Co. of New York City, New York (3)
- Arute Brothers (1)
- Arvid Grant & Associates of Seattle, Washington (2)
- Asa Nourse (1)
- Ash, Howard, Needles, & Tammen of Kansas City, Missouri (9)
- Asher Grant (1)
- Associated Contractors Inc. of Monroe, Louisiana (1)
- Atkinson-Windle Co. of Chillicothe, Missouri (3)
- Atlantic Bridge Co. (4)
- Atlantic Bridge Co. of Charlotte, North Carolina (3)
- Atlantic Bridge Co. of Greensboro, North Carolina (1)
- Atlantic Bridge Co. of Roanoke, Virginia (3)
- Atlantic County of New Jersey (1)
- Atlantic, Gulf & Pacific Co. of New York City, New York (7)
- Atlas Machine and Iron Works of Arlington, Virginia (4)
- Attica Bridge Co. of Attica, Indiana (33)
- Audley General Contractors of Bow, New Hampshire (1)
- August Borneman (4)
- Augustus Neidig (1)
- Augustus Schwaab (2)
- Augustus Smith (2)
- Ault-Rich Construction Co. of Cassville, Missouri (5)
- Austin Bridge & Road of Austin, Texas (2)
- Austin Bridge Co. of Dallas, Texas and Atlanta, Georgia (31)
- Austin Brothers Bridge Co. of Dallas Texas/Atlanta, Georgia (18)
- Austin F. Parsons (3)
- Austin Road Co. of Austin, Texas (1)
- Aven Hanford (2)
- B -- B&O Mount Clare Shops of Baltimore, Maryland (12)
- B&O Railroad (1)
- B. A. Scheeler (1)
- B. Carney (1)
- B. Griffin & Son (1)
- B. J. Carter (2)
- B. J. Lambert of Iowa City, Iowa (3)
- B. Koru (1)
- B. Perini & Sons, Inc. of Framingham, Massachusetts (2)
- B. R. Leffler (1)
- B. W. Candage & Sons of Seal Harbor, Maine (3)
- B.E. Sivyer (1)
- B.H. Hardaway (1)
- B.J. CRAY (1)
- B.J. Garnett (4)
- B.J. McGrann & Co. of Lancaster, Pennsylvania (2)
- B.M. Duncan (1)
- B.M. Krohn (1)
- B.W. Guppy (1)
- BA Sheeler (2)
- BACH Steel of Holt, Michigan (7)
- BICO Steel (1)
- Bailey Brothers (1)
- Baird Brothers (2)
- Baker & Koontz of Carthage, Missouri (3)
- Baltimore Bridge Co. of Baltimore, Maryland (6)
- Banden, Butin & Bowman (2)
- Bangs, Anson, & Co. (1)
- Barally & Ingersoll of Rochester, New York (3)
- Barber Construction Co. (3)
- Barham Brothers (1)
- Barlow & Mackey (1)
- Barnum and Counihan (1)
- Barron & Hole (1)
- Bart Moore, Inc. of San Antonio, Texas (4)
- Bartlett & Kling Co. of Cedar Rapids, Iowa (1)
- Bartlett & Ranney Inc. of San Antonio, Texas (1)
- Barton J. Sweat of Cedar Rapids, Iowa (1)
- Basic Marine Inc. of Escanaba, Michigan (3)
- Batcheler, Bowen, and Wolverton (1)
- Bateman Contracting Co. of Nashville, Tennessee (1)
- Bates & Rodgers Const'n Co (1)
- Bates & Rogers Construction Co. of Chicago, Illinois (8)
- Batson Brothers (1)
- Baxter L. Brown (1)
- Bay Shipbuilding Corp. of Sturgeon Bay, Wisconsin (1)
- Bayne & Hewett of Minneapolis, Minnesota (3)
- Bean & Co. (1)
- Bear Creek Co. (1)
- Bear Creek Construction Co. (1)
- Beattie & Cornell (1)
- Bechtel Corporation of San Francisco, California (1)
- Beckel Iron Foundry and Machine Shop of Bethlehem, Pennsylvania (5)
- Beckwith & Quackenbush of Rome, New York & Mohawk, New York (1)
- Bedford Foundry & Machine Co. (1)
- Bedford Iron Works (1)
- Bedwell Co. (1)
- Beebe Orchard Co. of Chelan, Washington (1)
- Beer's Building Co. of Seattle, Washington (1)
- Bela Fletcher of Claremont, New Hampshire (3)
- Beley Construction Co. of Livingston, Montana (1)
- Bell & Associates of Kansas City, Missouri (2)
- Bell & Bell of Watertown, Tennessee (2)
- Bell and Breckinridge (1)
- Bell-Bockel Co. of Altoona, Pennsylvania (1)
- Bellefontaine Bridge & Iron Co. of Bellefontaine, Ohio (24)
- Bellefontaine Bridge & Steel Co. (alternate name for Bellefontaine Bridge & Iron Co.)
- Bellefountaine Bridge Co. (1)
- Belmont Iron Works of Chester, Pennsylvania (4)
- Belvidere Construction of Belvidere, Illinois (1)
- Bement-Witt Lumber Co. of Shell Rock, Iowa (1)
- Ben C. Gerwick Co. (1)
- Ben Cole & Sons Construction Co. of Ames, Iowa (7)
- Ben D. Prater of Harrisonville, Missouri (1)
- Benesch of Chicago, Illinois (2)
- Benjam F. Hastman (1)
- Benjamin H. Davis of New York City, New York (3)
- Benjamin Henry Latrobe II of Philadelphia, Pennsylvania (3)
- Benjamin L. Crosby of St. Louis, Missouri (4)
- Benjamin Sears (1)
- Benjamin Trollinger of Haw River, North Carolina (1)
- Bennett & Talbot of Greensburg, Pennsylvania (2)
- Benno Janssen of St. Louis, Missouri (1)
- Benton Jones of Winterset, Iowa (2)
- Bergen & Bergen of Franklin, Indiana (1)
- Berger/Abam Engineers, Inc. (1)
- Bergmann Associates (1)
- Berlin Bridge Co. of New Berlin, Connecticut (1)
- Berlin Construction Co. of Berlin, Connecticut (36)
- Berlin Iron Bridge Co. of East Berlin, Connecticut (123)
- Berne Welch of Peru, Indiana (1)
- Bernhisel Construction Co. of Chicago, Illinois (1)
- Berriman & Anderson (1)
- Bethlehem Pacific Coast Steel Co. of Seattle, Washington (1)
- Bethlehem Steel Co. of Bethlehem, Pennsylvania (101)
- Bette & Cring of Latham, New York (1)
- Big 4 Railroad (1)
- Big Wabash Bridge Co. of Carmi, Illinois (1)
- Biggs and Pauley, Winfield, Kansas (1)
- Billmeyer, Nogel & Co. of Lewisburg, Pennsylvania (1)
- Biltolast Products Inc. of Ft. Payne, Alabama (2)
- Black & Veatch of Kansas City, Missouri (1)
- Blackburn & Whiteside of Mammoth Springs, Arkansas (1)
- Blackshire & Blackshare (2)
- Blackwell Engineering Co. of Merrifield, Virginia (3)
- Blair Boyle (1)
- Blodgett Construction Co. of Kansas City, Missouri (2)
- Bloomfield Bridge & Culvert, Inc. of Bloomfield, Iowa (1)
- Blount Brothers Construction Co. of Shreveport, Louisiana (1)
- Blow & Cote Inc. of Morrisville, Vermont (7)
- Boardman Co. of Oklahoma City, Oklahoma (11)
- Bogert-Carlough Co. of Paterson, New Jersey (1)
- Boise Construction Co. of Boise, Idaho (1)
- Boise Iron Works of Boise, Idaho (1)
- Boller & Hodge of New York, New York (2)
- Bontrager Construction Co. (1)
- Boody, Stone & Co. of Springfield, Massachusetts (1)
- Booker, Kiehl & Whipple of Seattle, Washington (1)
- Boomer, McGuire & Blakesley of Great Falls, Montana (1)
- Booth & Flinn Co. of Pittsburgh, Pennsylvania (7)
- Booth & Glinn Co. (1)
- Booth & Pomeroy, Inc. of Portland, Oregon (3)
- Bordwell & Zimmerman of Calistoga, California (1)
- Borg & Ericson of Chicago, Illinois (1)
- Boston Bridge Works of Boston, Massachusetts (89)
- Bowerman & McCloy of Seattle, Washington (1)
- Boyd E. Phelps Co. of Michigan City, Indiana (1)
- Boyington, Rust, & Bruce of Chicago, Illinois & Marseilles, Illinois (2)
- Boynton & Warriner of Cedar Rapids, Iowa (1)
- Brackett Bridge Co. of Cincinnati, Ohio (21)
- Brady & Simpson (1)
- Brasfield & Gorrie, LLC of Birmingham, Alabama (1)
- Braun-Fleming-Knollman & Prior of Columbus, Ohio (1)
- Brayman Construction Corp (2)
- Brazos River Bridge Co. (1)
- Brennecke & Fay of St. Louis, Missouri (1)
- Breslin Construction Co. of Louisville, Kentucky (1)
- Bridge Construction Corporation of Augusta, Maine (1)
- Briscoe Construction Co. of Stillwater, Oklahoma (1)
- Bristol Steel of Davison, Mississippi (1)
- Britton Bridge, LLC of Knoxville, Tennessee (1)
- Broadman Co. (1)
- Brodhead Construction (1)
- Bronx Asphalt Corporation of New York City, New York (1)
- Brookfield Construction Co. (1)
- Brooks & Dahlgren of Oklahoma City, Oklahoma (1)
- Brooks & Mixon of Decatur, Alabama (1)
- Brookville Bridge Co. of Brookville, Ohio (25)
- Broughton Lumber Co. of Underwood, Washington (1)
- Brown & Root Inc. of Houston, Texas (9)
- Brown Brothers of Lansing, Michigan (1)
- Bruce V. Christy of Seattle, Washington (1)
- Buchanan Bridge Co. of Bellefontaine, Ohio (1)
- Buchanan County Secondary Roads Department of Independence, Iowa (1)
- Buckeye Bridge Co. (1)
- Buckeye Bridge Works of Cleveland, Ohio (14)
- Buckeye Portland Cement Co. of Bellefontaine, Ohio (1)
- Buckland & Taylor Ltd. of North Vancouver, British Columbia, Canada (7)
- Buckner Bros. of Cleburne, Texas (2)
- Bud Burket (1)
- Bud Gentry (1)
- Bud King Construction Co. of Missoula, Montana (1)
- Built by convicts from the Montana State Prison of Deer Lodge, Montana (1)
- Bullen Bridge Co. (alternate name for Pueblo Bridge Co.)
- Burdick Bros. Inc. (1)
- Burdine Construction Co. of Magnolia, Arkansas (1)
- Burger Iron Co. of Mogadore, Ohio (1)
- Burgess & Niple of Columbus, Ohio (1)
- Burk Construction Co. of New Castle, Indiana (15)
- Burkhardt Steel Co. (1)
- Burnham & Ives of Bloomington. Illinois (1)
- Burns & McDonnell of Kansas City, Missouri (2)
- Burton Construction Co. of Richmond, Virginia (1)
- Bushman Construction Co. of St. Josesph, Missouri (4)
- Business Men's League of Durand, Wisconsin (1)
- Busk Tunnel Railway Co. (1)
- Butcher & Sweeney (1)
- Butcher-Sweeny (1)
- Butler-Ryan Co. of St. Paul, Minnesota (2)
- Byrne & Blake of Dubuque, Iowa (1)
- Byrne Brothers Dredging & Engineering Co. of Chicago, Illinois (2)
- Byron B. Carter (1)
- Byron Hiatt of Creston, Iowa (1)
- C -- C&F Teaming & Trucking Co. of Butte, Montana (1)
- C. A. Bryan (1)
- C. A. Clarke (1)
- C. A. Rasmussen Inc. of Valencia, California (1)
- C. B. Davison (1)
- C. C. Collins of Richland County, Ohio (1)
- C. C. Myers, Inc (2)
- C. C. Sykes (1)
- C. E. Allen (1)
- C. E. Christian (1)
- C. E. Ferris (1)
- C. G. Landon (1)
- C. G. Levander (3)
- C. G. Melville (1)
- C. G. Willis & Sons (1)
- C. H. Gildersleeve of Napa, California (8)
- C. H. Reimard of Bloomsburg, Pennsylvania (1)
- C. Holden (1)
- C. J. Nystedt (2)
- C. M. Heiss (1)
- C. M. Hershey (1)
- C. M. Ingersoll (3)
- C. Q. Horton of Austin, Texas (3)
- C. R. Wiggel (1)
- C. R. Yates (1)
- C. Raeber (8)
- C. S. Winvilliers (1)
- C. Tappan (1)
- C. W. Bagley (1)
- C. W. Bishop (1)
- C. W. Buchholz (1)
- C. W. Corbaley (1)
- C. W. Deterding, Jr of Sacramento, California (3)
- C.A. Bingham (1)
- C.A. Catching (2)
- C.A. Grinde Co. of Norway/Taopi Township, South Dakota (1)
- C.A. Holvik of Mason City, Iowa (1)
- C.A. Vincent (1)
- C.A. Wever & Son of Clayton, Illinois (1)
- C.B. Wing (1)
- C.C. Morrison (2)
- C.D. Forsbeck (1)
- C.E. Davis (2)
- C.E. Eastman (1)
- C.E. Flander (1)
- C.E. Maxwell & Son (1)
- C.F. Bibb (1)
- C.F. Dinsmore Co. of Ogden. Utah (3)
- C.F. Feldschau (1)
- C.F. Hunt Co. of Indianapolis, Indiana (1)
- C.F. Johnson & Son (1)
- C.F. Laws (1)
- C.F. Lytle Co. of Sioux City, Iowa (3)
- C.F. Metzger (1)
- C.G. Bridges (1)
- C.G. Thompson (1)
- C.H. Atkinson Paving Co. of Chillicothe, Missouri (5)
- C.H. Bock (1)
- C.H. Gildersleeve of Napa, California. (2)
- C.H. Kirsch (1)
- C.H. Norwood (1)
- C.H. Reynolds (1)
- C.I. Hosmer (1)
- C.J. Kelly (1)
- C.J. Lee (1)
- C.J. McGreevy (1)
- C.J. Montag (1)
- C.L. Creelman (1)
- C.L. Hubner Co. (1)
- C.L. Messmore (1)
- C.M. Bolton-Asst. (1)
- C.M. Corkum Co. (1)
- C.M. Driver (2)
- C.M. Neeld Construction Co. of Pittsburgh, Pennsylvania (2)
- C.M. Russell & Co. (1)
- C.P. Allen Contracting Co. of Denver, Colorado (1)
- C.P. Boner (1)
- C.P. Jones of Minneapolis, Minnesota (1)
- C.P. O'Reilly & Co. of St. Louis, Missouri (3)
- C.P. Smith (1)
- C.R Kent (1)
- C.R. Hill (1)
- C.R. Smith (1)
- C.S Riche (2)
- C.S. Johnson of St. Louis, Missouri (1)
- C.S. Mullen (2)
- C.S. d'Invilliers (1)
- C.T. Fogle Construction Co. (1)
- C.T. Gutleben (1)
- C.V. Dewart (1)
- C.V. Kerch (1)
- C.V. Laughlin (1)
- C.W. Atkinson Paving Co. of Saint Joseph, Missouri (1)
- C.W. Blakeley (1)
- C.W. Blakeslee & Sons of New Haven, Connecticut (2)
- C.W. Bowles Co. of New York, New York (1)
- C.W. Gilifillan (1)
- C.W. Higley (1)
- C.W. Lane & Co. Inc. of Atlanta, Georgia (1)
- C.W. Raynor of Portland, Oregon (1)
- C.W. Requarth Co. (1)
- C.W. Tracy (1)
- C.Y. Hamp (1)
- C.Y. Thomason Co. of Greenwood, South Carolina (2)
- CCC (3)
- CH2M Hill of Corvallis, Oregon (2)
- CJ Mahan Construction Co. of Grove City, Ohio (2)
- CMI-Promex, Inc. of Pedricktown, New Jersey (1)
- CON/SPAN Bridge Systems of West Chester, Ohio (2)
- Cage Bros. of Bishop, Texas (5)
- Cage Brothers (1)
- Caldwell & Drake Iron Works of Columbus, Indiana (1)
- Caleb Lamson (1)
- Calhoun-Burns & Associates Inc. of West Des Moines, Iowa (1)
- California Bridge & Construction Co. (1)
- California Division of Highways (2)
- California Highway Commission (2)
- Call Construction Co. (1)
- Caltrans (4)
- Calumet Land Co. (1)
- Calvert Vaux of London, England, United Kingdom (9)
- Calvin A. Gould (1)
- Cambria Iron Works of Johnstown, Pennsylvania (2)
- Cambria Steel Co. of Johnstown, Pennsylvania (21)
- Camden Iron Works (1)
- Cameron Bros. & Finley (1)
- Cameron and Halby (1)
- Cameron, McManus, & Joyce of Keokuk, Iowa (1)
- Camp Fire Girls of America of Kansas City, Missouri (1)
- Campbell Bros. of Kansas City, Missouri (1)
- Cannon & Associates of Phoenix, Arizona (1)
- Canton Bridge Co. of Canton, Ohio (174)
- Capital City Brick & Pipe Co. of Des Moines, Iowa (1)
- Capital City Construction Co. of Des Moines, Iowa (1)
- Capital Engineering & Construction Co. (1)
- Capital Steel Co. of Lincoln, Nebraska (1)
- Capitol Construction Co. of Columbus, Ohio (8)
- Capitol Construction Co. of Texas (1)
- Capt. Joseph Balsey (1)
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