- Weeks & Assoc
- Weeks & Assoc
- Wellington Investigations Inc
- Wells & Co
- West Texas Discovery Svc
- West Texas Investigation Inc
- West Texas Investigation Inc
- West Texas Investigation Inc
- West Texas Investigations
- West Texas Investigations
- West Virginia Investigations
- Western Field Investigation
- Western Investigations
- Westpark Investigations
- White Eagle Investigative Svc
- Wilburdon Investigation Inc
- William A Harry
- William A Harry
- William B Robinson Jr PI
- William Parrish & Assoc
- Williams Investigative Svc
- Wilson & Assoc Investigative
- Wilson Resource Assoc
- Winco Agency/Licensed & Bonded
- WJP & Assoc
- WJP & Assoc
- WMW & Assoc Inc
- Wood & Assoc
- Woods Investigation
- Woodward Enterprises
- Worldwide Security
- Worldwide Security
- Worldwide Tracers
- Wrenn Investigative Svc
- WV Bureau Of Investigations
- Wynne Investigations Inc
- Wynne Investigations Inc
- X-Treme Investigation
- Yager Investigations
- Yager Investigations
- Young Investigations
- Zack Shelton Assoc
- Zenith Investigations
