"Them! Don' listen properly, do they? Don' look properly either. Never notice nuffink, they don't." 
     -- Stan Shunpike

People

• The Dursleys
• Vernon Dursley - director of a firm that makes drills, no neck, thickset and bullheaded
• Petunia Dursley (maiden name: Evans) - Lily Potter's sister, definitely not magical - long neck, horsey teeth; always spying on neighbors, fanatic about neatness, thinks Dudley's immense size is baby fat
• Dudley Dursley
• Mrs. Figg - neighbor, sometimes takes care of Harry
• her cats: Tiddles, Snowy, Mr. Paws, Tufty
• although Mrs. Figg isn't really a Muggle at all! (BP)
• Piers Polkiss - friend of Dudley's
• other friends: Dennis, Malcolm, Gordon
• at the zoo (SS2)
• keeper of the reptile house
• zoo director
• Aunt Marge - (Miss Marjorie Dursley, Vernon's sister) 
• Yvonne - Aunt Petunia's friend
• Col. Fubster - looks after Aunt Marge's bulldogs when she's away (PA2)
• Mr. and Mrs. Mason - builder, dinner guests of the Dursley's; Mrs. Mason is deathly afraid of birds (CS1)
• Muggle parents of Hogwarts students
• Dr. and Dr. Granger - Hermione's parents, who are both dentists (
• Seamus Finnegan's father (whose wife didn't admit that she was a witch until they were married) (SS
• Mr. Creevey - a milkman who has two sons who are wizards (CS
• on television: The Great Humberto, on Monday nights (SS3)
• toothless old man - lends them his rowboat to get to the hut on the rock (SS3)
• owner of the Railview Hotel (a woman) (SS3)
• known inhabitants of Little Hangleton fifty years ago (c. 1940):
• Dot
• proprietor of the pub
• the Riddle family: Mr & Mrs, son Tom
• Frank Bryce, Riddle's gardener, 28 at time of deaths (b. 1912)
• the cook - told the pub that Frank was guilty, no doubt about it
• the maid - found the bodies
• Mr. Roberts and family (wife, two children) - campground manager who had a most peculiar couple of days recently, although he's forgotten all about it... (GF7, GF9)
• other campground manager: Mr. Payne
• Jim McGuffin - weatherman on the evening news Vernon Dursley was watching on November 1, 1981
• Ted - newsreader on the evening news, November 1, 1981
• 'Dodgy Dirk' - an inhabitant of Ilfracombe who insists to this day that a "dirty great flying lizard" attacked him on the beach. He is the only Muggle who seems to remember that attack by a dragon in Ilfracombe in 1932; all the other Muggles involved were given Memory Charms by a wizarding family which happened to be vacationing there that day. (FB)
• Hetty Bayliss - lives in Norfolk; on 1 Sept 1992 she was sure she spotted a flying car while she was hanging out her wash (CS5).
• Angus Fleet - lives in Peebles, a town in Scotland which is on a route between London and Hogwarts; Angus was mystified by a flying Ford Anglia on 1 Sept 1992 (CS5)
• Brother Benedict - Franciscan monk from Worchestershire during the Middle Ages (FB)
• had an encounter with a Jarvey but thought is was an overlarge ferrret, which insulted him then bit him on the nose
• other monks:
• the friar - didn't believe Benedict that the ferret talked to him
• Brother Boniface - made turnip wine