- Tupy American Foundry Corp
- Tusco Casting Corp
- Twin City Holland Int Mfg
- Two Crucibles Studio Foundry
- U S Foundry & Mfg
- U S Foundry & Mfg Corp
- U S Foundry & Mfg Corp
- U S Pipe & Foundry Co Inc
- Ulven Co
- Uni-Cast
- Unicast Development Co
- Unimin Corp
- Unitcast Canada
- United Division Mid City
- United Foundries Inc
- United Machine & Foundry
- Universal Foundry & Machine
- Urban Accessories Inc
- Urdan Industries
- Urdan Industries
- Valley Brass & Aluminum
- Varnell's Aluminum Foundry
- VFI Corp
- Vicksmetal Armco Assoc
- Victoria Precision Alloys Inc
- Village Castings
- Vulcan Engineering Co
- Vulcan Foundry Inc
- W C Bradley
- Wabash Alloys-Tipton
- Walla Walla Foundries
- Wallbar
- Wards Sculptural Arts
- Ware Foundry Inc
- Ware Industries
- Warren Alloy
- Washburn Iron Works Inc
- Waunakee Alloy Casting Corp
- Waupaca Foundry Inc
- Wear-Tek
- Wemco Casting
- Westarr Pipe Products Inc
- Westarr Products Inc
- Western Foundries Inc
- Weston Studio-Foundry LTD
- Westwick Foundry LTD
- Westwood Aluminum Casting Inc
- White Cloud Mfg Co
- William Binnings Sculptors
- William Mc Murray
- William Mc Murray
- Williamsburg Lodge
- Wisco Alloys Inc
- Wisconsin Precision Casting
- Wolf Steel Foundry
- Wolff & Dungey Inc
- Wollaston Alloys Inc
- Wolverine Bronze Co
- Wright Co
- Wyman Gordon Co
- Y-8 Bronze