There were 17,217 total businesses in the county zip codes, with 2,388 construction businesses (13.9%) accounting for the largest proportion of these businesses. 9,306 businesses (54.1%) had fewer than five employees, and 93 (0.5%) had 250 or more.
Median-sized businesses in 39 counties have less than four employees.
The following table shows the median business size in all Washington counties.
Median business size in all Washington counties (2016)
| County | Total Employees |
|---|---|
| Adams County | 1-4 |
| Asotin County | 1-4 |
| Benton County | 1-4 |
| Chelan County | 1-4 |
| Clallam County | 1-4 |
| Clark County | 1-4 |
| Columbia County | 1-4 |
| Cowlitz County | 1-4 |
| Douglas County | 1-4 |
| Ferry County | 1-4 |
| Franklin County | 1-4 |
| Garfield County | 1-4 |
| Grant County | 1-4 |
| Grays Harbor County | 1-4 |
| Island County | 1-4 |
| Jefferson County | 1-4 |
| King County | 1-4 |
| Kitsap County | 1-4 |
| Kittitas County | 1-4 |
| Klickitat County | 1-4 |
| Lewis County | 1-4 |
| Lincoln County | 1-4 |
| Mason County | 1-4 |
| Okanogan County | 1-4 |
| Pacific County | 1-4 |
| Pend Oreille County | 1-4 |
| Pierce County | 1-4 |
| San Juan County | 1-4 |
| Skagit County | 1-4 |
| Skamania County | 1-4 |
| Snohomish County | 1-4 |
| Spokane County | 1-4 |
| Stevens County | 1-4 |
| Thurston County | 1-4 |
| Wahkiakum County | 1-4 |
| Walla Walla County | 1-4 |
| Whatcom County | 1-4 |
| Whitman County | 1-4 |
| Yakima County | 1-4 |
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