There were 2,947 total businesses in the county zip codes, with 353 retail trade businesses (12%) accounting for the largest proportion of these businesses. 1,523 businesses (51.7%) had fewer than five employees, and seven (0.2%) had 250 or more.
The county with the largest median business size was Campbell County. Median-sized businesses in Campbell County was between five and nine.
The following table shows the median business size in all Wyoming counties.