Directions to CheckSum's headquarters in Arlington, Washington

• 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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