State Democratic Party officials awarded it to Clinton, leading her press secretary, Brian Fallon, to tweet Monday:
"We have won final delegate in NV CD-4, meaning we won NV 20-15. HRC now takes natl delegate lead, 52-51. Not planning on ever giving it back."
Clinton has now won two out of three state contests, but Sanders has claimed almost equal numbers of delegates — the ultimate determining factor of who gets the nomination.
In Nevada, Sanders ended up with 15 delegates to Clinton's 20. She claimed two more delegates than Sanders in her squeaker of a victory in Iowa and finished six delegates behind him in New Hampshire.
Clinton's campaign maintains that the delegate race becomes much more difficult for Sanders from here on out.
She is far ahead of Sanders in the next contest here on Saturday and is likely to expand her overall lead in delegates.
After South Carolina comes Super Tuesday, when Sanders is likely to roughly split the 11 Democratic contests with Clinton but is unlikely to pass her with delegates.
Clinton also has the support of dozens of so-called "super delegates," including members of Congress, whose votes count extra.
Clinton's campaign considers the overall delegate lead an answer to complaints among some Sanders allies that Clinton has not earned sufficient popular support to justify her support among super delegates.