Is there any way to block a few websites even for an administrator user?

Hi, I would like to block a few specific websites on my imac, and someone told me to go to system preferences, accounts, and parental controls. But it says you can't block websites for an account user (which is what I am). There is an option to block all websites, except what is on the bookmarks bar, but I don't want to do that and not be able to web search. I just want to block a few specific websites. Is there any way to do this? Thanks!

Hello and Welcome to Apple Discussions. 
You can do this using OS X's built in Firewall but you'll want to use Flying Buttress (link) to give you a nice front-end to make the changes with.
First find the IP addresses of the sites you wish to block.
Open Macintosh HD > Applications > Utilities > Network Utility > Tracetroute tab.
Enter the address i.e. www.apple.com and traceroute will give you the IP i.e. 17.149.160.10.
Load up Flying Buttress and add a new filter (for example on my Powerbook I always connect via Airport so I choose the Airport tab and click 'Add New Filter').
Action:"Deny" the Service:"World Wide Web" from Source:"My Computer" to Other...:"Host IP: 17.149.160.10".
Add a new filter for each page you wish to block.
Remember to go through and check all the settings on all the tabs are set to "Deny" unless you are using them to maintain the integrity of your Firewall.
Hope that helps.
mrtotes

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