Garcia, a Democrat who served 8 years as mayor, had a 2-1 lead over Republican John Briscoe in initial results.
Garcia was the first Latino and first openly gay mayor in the history of Long Beach.
He lost his mother to COVID and dedicated his win to her in his speech to supporters.
"That hard-working woman who worked in clinics, who cleaned houses, who was a true immigrant in every sense of the word, is why I'm here today," Garcia told the crowd. "Why my brother is here today. Her fight and love for this country is what made us today."
Garcia will fill the seat of Rep. Alan Lowenthal, who is retiring.
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