Name (Optional but adds value to the letter if you are resourceful as to find out the name of the person who is recruiting). Title, Company, Address, City, State, Zip Code _ Salutation _ Dear Mr. /Ms. Last Name, (It is recommended that the recruiting person's name is sourced and mentioned instead of opting for Dear Sir/Madam. But do not use "To whom it may concern")
The third and last paragraph provides means to follow up your application. You can slightly review what you have previously mentioned in the letter to provide more emphasis. You can also provide means for contacting you in case you are considered in the next phase of the application process.