"It's been widely felt throughout the Seattle area", said Paul Caruso, a USGS geophysicist.
The epicenter of the quake was near Monroe in Snohomish County. The natural disaster was relatively shallow, originating about 14 miles beneath the surface, according to a USGS map.
There are reports of items falling off walls and shelves but no reports of damage. Police in nearby Lake Stevens reported no damage to city infrastructure.
This morning's tremor follows a cluster of quakes off Vancouver Island last week and a pair of major earthquakes that shook southern California on Thursday and Friday.
The state Department of Transportation sent crews out to inspect bridges but no damage was found by Friday afternoon.
KIRO reports the quake is the largest to hit the region since the 6.8 M 2001 Nisqually natural disaster.
There isn't a connection between this quake and the ones that rocked California earlier this month, Steele said. "It's not impossible, but it's small".