Noone is married to Mireille (born Strasser), a Strasbourg-born French woman. They were married on 5 November 1968, Noone's twenty-first birthday. The couple have one daughter, Natalie (born 3 July 1985), who is also currently a singer-songwriter. Peter Noone is a naturalised US citizen currently living in Santa Barbara, California.

After Herman's Hermits disbanded in 1971, Noone recorded four singles for UK RAK Records, one single for UK and US Philips, and several singles for the small UK record label, Bus Stop Records. His first RAK single, "Oh! You Pretty Things", peaked at No.12 in the UK Singles Chart. It was written by David Bowie, who also played piano on the track. In 1974 Noone scored a No. 15 US AC and No. 101 US Bubbling Under success with "Meet Me on the Corner Down at Joe's Cafe" on the Casablanca Records label. In 1989 he had a No. 19 US AC hit with his solo recording of Goffin and King's "I'm Into Something Good" from the film The Naked Gun: From the Files of Police Squad!. In the 1980s Noone released a solo album, One of the Glory Boys. Noone appeared as Frederic in the New York Shakespeare Festivals' Broadway Production of Pirates of Penzance. He also toured the United States in the National Production and appeared in the Theatre Royal Drury Lane, West End Production. He also appeared in the National touring company of Romance /Romance.

Since the 1980s, Peter Noone has performed under the name Herman's Hermits starring Peter Noone.

His classic hits included: "I'm into Something Good", "Mrs. Brown, You've Got a Lovely Daughter", "I'm Henry the Eighth, I Am", "Silhouettes", "Can't You Hear My Heartbeat", "Just a Little Bit Better", "Wonderful World", "There's a Kind of Hush", "A Must to Avoid", "Listen People", "The End of the World" and "Dandy". Herman’s Hermits sold more than 60 million recordings, with 14 gold singles and seven gold albums. The Hermits were twice named Cashbox's "Entertainer of the Year".