Mourners gathered at the Acts Full Gospel Church in East Oakland. Many wore shirts with her picture.
Congresswoman Barbara Lee spoke at the ceremony.
BART General Manager Grace Crunican attended the service. Wilson's family is planning to sue BART, saying the transit agency didn't do enough to protect her.
Eighteen-year-old Nia Wilson's death made national headlines. Police call her murder random and unprovoked. She was stabbed to death on the MacArthur BART platform. Her sister was also stabbed, but survived.
One of the security officers from Nia's school, Dewey Academy, said she will be missed.
"She made an effect on people. Everywhere she went she made some kind of effect on people and if you meet her, you will never forget her. I only was at Dewey for three years but from the day I met her, we clicked," said Renna Taylor.
For more stories, photos, and video on Nia Wilson, visit this page.
CONTINUING COVERAGE ON DEADLY BART STABBING:
- What we know about deadly stabbing at Oakland's MacArthur BART station
- Here's how you can help the family of BART stabbing victim Nia Wilson
- 'Remember Her': A tribute to Nia Wilson
- 'He was wiping off his knife': BART stabbing victim recalls horrific attack that killed sister
- Chilling dispatch call describes terrifying fatal MacArthur BART stabbing
- Heartbroken father demands justice after daughter stabbed at BART station
- Anne Hathaway shares powerful post about Nia Wilson
- Artists nationwide remember BART stabbing victim Nia Wilson in their art
- Celebrities share grief, sorrow for BART stabbing victim Nia Wilson
- 'Stand down': BART stabbing victim's godfather makes plea to black community
- TIPS: How to stay safe on BART
- Bart releases info on pair of homicides