Announcing the results of the Republican and Democratic primaries held on March 15, Missouri Secretary of State Jason Kander tweeted: "I certified the presidential preference primary. @HillaryClinton and @realDonaldTrump have officially won Missouri."
The votes in both parties were too close to call. In the Republican primary polls, Trump and rival Texas Senator Ted Cruz were neck-and-neck, as were Clinton and Vermont Senator Bernie Sanders in the Democratic contest.
On the Democratic side, the 68-year-old former secretary of state also led Sanders also by 0.2 percentage points - 49.6 per cent to his 49.4. She won the election by about 1,500 votes of the 630,000 cast in the Democratic primary.
Each candidate will receive 34 delegates, but with superdelegates included, Clinton will have 46, CNN reported.
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69-year-old Trump is looking to bounce back from a decisive loss in last week's Wisconsin primary, while Clinton has lost eight of the last nine Democratic contests.
"It is great to have yet another victory as we look forward to the upcoming primary in New York," Trump said in a statement ahead of the crucial primaries here on April 19.
New York will award 95 Republican delegates while the two Democratic candidates are fighting over 247 delegates in the city.