CheckSum corporate headquarters are located at 6120 195th Street NE, Arlington, Washington, 98223, USA.   Our office is approximately 50 miles north of downtown Seattle, Washington and about 60 miles north of the Seattle - Tacoma (Sea-Tac) International Airport.   Vancouver, British Columbia, Canada is about 100 miles north of CheckSum. 

Phone  1-877-CHECKSUM (1-877-243-2578) or 360-435-5510
Fax   360-435-5535

Transportation from the Seattle - Tacoma (Sea-Tac) Airport to CheckSum: Car Rental Several major car rental companies have facilities at or near the airport.

Directions from the Airport to CheckSum (see the maps below):

• At the airport, follow the signs "To Freeways" 
• Take the Washington State Route 518 EAST ramp toward I-5, I-405, and Seattle 
• Merge onto State Route 518 EAST and move to the left lane 
• Take the I-5 NORTH exit on your left, north to Seattle 
• Follow I-5 NORTH through downtown Seattle, for about 55 miles 
• Take the " Lakewood - Smokey Point  Exit 206 " 
• From the exit ramp turn Right onto 172nd Street NE 
• Follow 172nd Street about 1.8 miles from I-5 and at the east side of the Arlington Airport move into the left turn lane at the traffic light 
• Turn left onto 59th Ave NE and continue north for about 1 mile 
• At the 4-way stop sign at 188th St. NE, continue north on 59th Ave  
• At about 0.2 mile, 59th Ave turns right and you are now on 195th St.NE 
• Continue on 195th St. NE about 1 block, CheckSum is on your right at the corner of 195th and 62nd Ave 
• Take the first right into our parking lot

On your return to the Sea-Tac airport, the exit from I-5 south to State Route 518 West is exit number 154B.
 

 



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Approximately 3 miles from CheckSum,
free hot breakfast buffet, restaurant,
indoor pool, spa & fitness center,
wireless internet, convenient to I-5
freeway at exit #206.
 

Approximately 2 miles from CheckSum,
continental breakfast, free internet,
convenient to I-5 freeway at exit #206.