this was something that all businesses would list on their websites; clearly, this is not

Research and list 10 different interior design businesses within the greater Sacramento region. 
The information is out there, it may just take some time to find it all. I thought this was something that all businesses would list on their websites; clearly, this is not the case.  Some do, most do not.  I then tried (on Firefox or Google) the search prompt “interior design LLC”  this brought up many ID businesses that are LLCs.  This may be done for Limited Partnerships and other business types too.  In California, the Secretary of State Office ( is where businesses register.  I would imagine that there is a search tool on their site too.