This category is for retail companies (aka retailers) established in the decade 1660s.
There are many subtypes of retail companies, some of which are tracked by year of establishment. Typically, companies are classed to this category if they are primarily retailers. For example, if a company is a clothing manufacturer which also sells to end customers, then it will be classed to Category:Clothing companies by decade of establishment; likewise for other company types.
Subcategories
This category has the following 4 subcategories, out of 4 total.