There are various templates for online portfolios - and I can suggest two, both of which I’ve used.
   One is the National Press Photographers Association - through its membership.  NPPA has improved it a lot since first offering it to members; each  thumbnail lets viewers click for a caption.  And the easy advantage of NPPA’s portfolio - as a benefit of membership - is that NPPA’s members are easily searched by state, which is how I got my first on-assignment work.
   But nothing beats Format - previously 4ormat - for professional-looking Web portfolios that your name or business is the Web address of.  A Format portfolio is very easy to build - and very versatile, allowing blogs like mine here; see my Format portfolio at Matt-Maggio.com.  
   Any Format portolio is easily tagged with tags such as your state, your city, what kind of photo work you do.
   Of course, you can always put together a redirect to take your choice of Web address to a NPPA portfolio you have.