President Donald Trump and Democratic challenger Joe Biden are battling it out for the White House, with polls closed across the United States Tuesday — and a long night of waiting for results in key battlegrounds on the cards.

The results are flowing in, with US media projecting wins for the Republican incumbent so far in 23 states including big prizes Florida and Texas, as well as Indiana, Kentucky, Missouri and Ohio — all states he won in 2016.

Biden has captured 18 states including his home state Delaware and big prizes California and New York, as well as the US capital. As with Trump, so far, all states claimed by Biden were won by Democrat Hillary Clinton in 2016.

So far, that gives Biden 223 electoral votes and Trump a maximum of 214, because Nebraska splits its electoral votes based on congressional district (see note below).

But a number of key battleground states are still up in the air, including Arizona, Georgia, Michigan, Pennsylvania and Wisconsin.

The magic number of electoral votes is 270.

The following is a list of the states won by each candidate and the corresponding number of electoral votes, based on the projections of US media including CNN, Fox News, MSNBC/NBC News, ABC, CBS and The New York Times.

TRUMP (214)*

Alabama (9)

Arkansas (6)

Florida (29)

Idaho (4)

Indiana (11)

Iowa (6)

Kansas (6)

Kentucky (8)

Louisiana (8)

Mississippi (6)

Missouri (10)

Montana (3)

Nebraska (5) *

North Dakota (3)

Ohio (18)

Oklahoma (7)

South Carolina (9)

South Dakota (3)

Tennessee (11)

Texas (38)

Utah (6)

West Virginia (5)

Wyoming (3)

BIDEN (223)

California (55)

Colorado (9)

Connecticut (7)

Delaware (3)

District of Columbia (3)

Hawaii (4)

Illinois (20)

Maryland (10)

Massachusetts (11)

Minnesota (10)

New Hampshire (4)

New Jersey (14)

New Mexico (5)

New York (29)

Oregon (7)

Rhode Island (4)

Vermont (3)

Virginia (13)

Washington (12)

STATES NOT YET CALLED

Alaska

Arizona

Georgia

Maine

Michigan

Nevada

North Carolina

Pennsylvania

Wisconsin

* Nebraska splits its five electoral votes — two electors are assigned based on the plurality of votes in the state, and the other three are awarded based on congressional district. Biden could eventually peel at least one of these votes away.