There were 368 total businesses in the county zip codes, with 62 construction businesses (16.8%) accounting for the largest proportion of these businesses. 249 businesses (67.7%) had fewer than five employees, and none had 250 or more.
The county with the largest median business size was Nez Perce County. Median-sized businesses in Nez Perce County was between five and nine.
The following table shows the median business size in all Idaho counties.