- White Pine Engineering
- White River Engineering Inc
- Whitman & Howard Engineer
- Wideman & Assoc Inc Engrs
- Wiercioch Associates Inc
- Wilde Coyote Inc
- Willcor Inc
- William E Fitzgerald
- William's Engineering
- Williams Engineering
- Williams Systems Engineering
- Wills Ecology Engineering Co
- Winner Bros Engineers
- Wirthco Engineering Inc
- Wolf Creek Engineering Pllc
- Wood Engineering Assoc
- Wright Pierce Engineering
- WZFX Engineering
- Xenomics Inc
- Xinetics Inc
- Yarger Engineering Svc
- Yarmus Engineering PC
- Yee Engineering
- Ystral Inc
- Yung International Engineering
- Yuzon & Assoc Structural Engr
- Zia Engineering & Envrnmntl
- Zia Engineering Environ
