There is no "official" website for consumers to get their credit scores at. You will find various websites like freecreditreport.com, annualcreditreport.com, etc. that will sell you a credit score. But none of them are the "official" credit score that all creditors will use. The reason why? Is that because each type of creditor (credit card, car loan, mortgage loan) uses a distinct credit scoring system that gives more or less weight to the various items on your credit report. For example a car loan creditor will give more weight to your past car payment history than they will give to credit card payment history.
I suspect you are inquiring about your credit score to qualify for a mortgage. If so, then you will want to check your credit scores using a website that uses the scoring models that mortgage lenders use - called "FICO scores". Experian, TransUnion and Equifax are all credit reporting agencies that will generate a FICO score for a mortgage lender to check... however TransUnion & Equifax are the only two that will allow a consumer to get their own FICO score, Experian no longer allows consumers to do so (as consumers aren't credit reporting agencies customers, the creditors are). The website http://www.myfico.com
provides FICO scores from Equifax & TransUnion, so when a potential client of mine wants to find out their credit scores ahead of me checking them, that is the only website I recommend, because that is the only website that will provide FICO scores. For your Experian FICO score, which as a consumer you cannot get, I recommend you compare to credit report data from your Experian http://www.annualcreditreport.com
credit report to your TransUnion & Equifax reports from that same website so you can gauge what it'll likely be. http://www.annualcreditreport.com/
is the official website for you to get your credit report data (but the credit scores from that website are not FICO scores, so do not rely on them/expect them to be what a mortgage lender checks).
Hope you've found this information helpful.
Shane Milne | Lending in all 50 states | NMLS #81195