Former President Clinton is supporting Tom Suozzi, while ex-New York Mayor Rudy Giuliani is lining up behind Ed Mangano's bid for a second term.
About 37,000 have already enrolled.
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New York officials said about 150,000 people have signed up through the state.
The county event takes place Wednesday in Bethpage.
TOBAY NOTEBOOK: Also, Halloween festival planned for Saturday.
News from Nassau County this week.
Share your thoughts about the upcoming race on our new open blog, The Soapbox.
Local legislator says veterans need not pay for a distinction that was earned.
New York Post says state leaders are courting the Donald.
The Office of Parks, Recreation & Historic Preservation said it is considering an appeal.
TOBAY NOTEBOOK: The annual waterfront celebration will have new exhibits and draw giant crowds.
The county executive leads Tom Suozzi by 17 points, according to a poll released Saturday night.
Some Port Jeff trains east of Hicksville will be eliminated as switches are replaced.
Cuomo added that if the debt ceiling isn't increased, it would damage state revenues and would lead to sizable job losses throughout all sectors.
Incumbent and former County Executives battle on taxes, Coliseum, and keeping jobs in Nassau.
All eyes are on the 2014 Congressional race.
Nominations forms available now for 16th annual town-wide awards program.
The event, which takes place at the Wheatley School in Old Westbury, is being sponsored by the Nassau County Village Officials Association.
Heavy winds ahead of severe weather plays havoc with Oyster Bay line Monday.
The new registration system was set up to cut down on double dipping.
Here is everything you need to know if you still need to register.
TOBAY Notebook: Also, lottery applications now open for holiday concert series.
Israel's staff says office is safe.
Former Gov. George Pataki. and former state comptroller H. Carl McCall join state panel that will try to trim business, corporate and income tax burden.
A technician inadvertently switched two blood samples, according to a letter obtained by NBC.
North Shore residents share their views on Facebook.
Town agrees to help finance $15.25 million in improvements.
National Park Service facilities is among the first affected by the federal shutdown.
The state placed a bulletin on the homepage, asking "users who are unable to log in to come back to the site later when these issues will be resolved."
The law eliminates a loophole where certain convicted rapists could request visitation or custody.
The federal money will be used to pay for tree removal, vegetative debris hauling, vegetative debris chipping and stump removal.
OYSTER BAY NOTEBOOK: Variety of pets available for adoption at upcoming Plainview event.
Unemployment rate at 6.2 percent in August.
The move is expected to generate $2 billion in new revenue for the postal service.
Hurricane Sandy damaged the 366-foot Eel Creek Boardwalk.