Early voting turnout numbers released Tuesday in two western battleground states show mixed results one week before Election Day.

In Nevada, more Democrats have cast their ballots already, while more Republicans have done the same in Colorado, according to the official numbers.

In Nevada, nearly half a million voters have either voted early in person, by mail, or by absentee ballot, the Nevada Secretary of State's office confirmed.

As of now, Democrats have an edge in the state, with 215,754 turning out their vote, compared to 181,278 Republicans. About 86,840 voters with a different party affiliation have also voted.

The state, with six electoral votes, has been highly contested territory. Then-candidate Barack Obama carried Nevada in 2008 by 12.5 percent over Sen. John McCain.

A recent NBC News/Wall Street Journal/Marist poll, however, showed the state in a tight race between Obama and Republican presidential nominee Mitt Romney. The survey, released last week, indicated that the president was ahead by three points in Nevada.

The poll marked the latest in a series of polls that show Obama with an advantage over Romney in the state.

The picture looks different in Colorado, where slightly more Republicans have turned out to vote. According to the secretary of state's office, nearly a million people have made their pick, about 40 percent of the total voter turnout in 2008.

About 370,990 Republicans have cast their ballots compared to roughly 343,720 Democrats. Meanwhile, about 241,000 voters who were unaffiliated also turned out.

Colorado, with nine electoral votes, also shows a tight race. A new American Research Group poll released Monday indicated Romney has a narrow one-point edge over Obama, 48 percent to 47 percent, in the state.

Along with Nevada, Obama also carried Colorado four years ago, turning the state from red to blue and winning by 9 percent.

Both Romney and Obama campaigned in Colorado last week, and the president was scheduled to return to the state on Tuesday but canceled his plans to monitor conditions related to Superstorm Sandy.