- Will Electronics
- Willco Construction Co Guardhs
- William J Mccarthy Invest Inc
- William J Mccarthy Invest Inc
- Willowbend North Glen Security
- Wilson's Security Svc
- Winfield Security Corp
- Winrock Security Office
- Wire Stream Security Inc
- Wolf Laurel Security Inc
- Wolf Protective Agency
- Wolsey Investigative Svc Inc
- Wood Security
- Wood's Security
- Woodlake Security
- World Investigative
- World Wide Alarm Svc
- Worldwide Security Assoc Inc
- Worldwide Security Assocs
- Worlwide Security Svc LTD
- Wright's Security Svc
- Yale Enforcement Co
- Yale Enforcement Svc Inc
- Yankee Detective Agency
- York Security
- Ziegler & Assoc
