Maria's number is correct. Maria doesn't have an "S" at the end, such as Chris, so you place the apostrophe before the "S"
Examples:
Maria's Number
Chris' Number (Not Chris's or Chri's Number)
Marias Massacre happened in 1870.
the band moon fall sings marias entrance music.
marias are formed by hot ash and lava coming through the moons craters
Marias Ghost - 2010 was released on: USA: 2010
Tres Marias Golf Club was created in 2002.
Tres Marias Island Mouse was created in 1898.
Marias menn - 2006 is rated/received certificates of: Norway:A
Mark Marias was born on March 19, 1971, in Riverside County, California, USA.
The plural possessive noun of "Maria" is "Marias'" if you want to show that multiple Marias possess something.
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Because he wanted to.