Jerry West: The Happy Hollisters

• Main characters: The Hollister family, consisting of five children (Pete, Pamela, Ricky, Holly, and Sue), and their parents (John and Elaine)
• Setting: The city of Shoreham (as far as I know, no state is ever mentioned)
• Bold type indicates a book I've read.

The Happy Hollisters is a series of books for children, published by the Stratemeyer Syndicate (also the publisher of the Nancy Drew and Hardy Boys series), between 1953 and 1969. The series was written by Andrew E. Svenson, using the pseudonym Jerry West, and was illustrated by Helen S. Hamilton. 

1. The Happy Hollisters  (1953)
   
2. The Happy Hollisters on a River Trip  (1953)
3. The Happy Hollisters at Sea Gull Beach  (1953) 
4. The Happy Hollisters and the Indian Treasure  (1953) 
5. The Happy Hollisters at Mystery Mountain  (1954) 
6. The Happy Hollisters at Snowflake Camp  (1954) 
   
7. The Happy Hollisters and the Trading Post Mystery  (1954) 
8. The Happy Hollisters at Circus Island  (1955) 
9. The Happy Hollisters and the Secret Fort  (1955) 
10. The Happy Hollisters and the Merry-Go-Round Mystery*  (1955) 
11. The Happy Hollisters at Pony Hill Farm*  (1956) 
12. The Happy Hollisters and the Old Clipper Ship  (1956) 
13. The Happy Hollisters at Lizard Cove  (1957) 
14. The Happy Hollisters and the Scarecrow Mystery  (1957) 
15. The Happy Hollisters and the Mystery of the Totem Faces  (1958) 
16. The Happy Hollisters and the Ice Carnival Mystery  (1958) 
17. The Happy Hollisters and the Mystery in Skyscraper City  (1959) 
18. The Happy Hollisters and the Mystery of the Little Mermaid  (1960) 
19. The Happy Hollisters and the Mystery at Missile Town  (1961) 
20. The Happy Hollisters and the Cowboy Mystery  (1961) 
21. The Happy Hollisters and the Haunted House Mystery  (1962) 
22. The Happy Hollisters and the Secret of the Lucky Coins  (1963) 
23. The Happy Hollisters and the Castle Rock Mystery  (1963) 
24. The Happy Hollisters and the Cuckoo Clock Mystery  (1963) 
25. The Happy Hollisters and the Swiss Echo Mystery  (1963) 
26. The Happy Hollisters and the Sea Turtle Mystery  (1964) 
27. The Happy Hollisters and the Punch and Judy Mystery  (1964) 
28. The Happy Hollisters and the Whistle Pig Mystery  (1964) 
29. The Happy Hollisters and the Ghost Horse Mystery  (1965) 
30. The Happy Hollisters and the Mystery of the Golden Witch  (1966) 
31. The Happy Hollisters and the Mystery of the Mexican Idol  (1967) 
32. The Happy Hollisters and the Monster Mystery  (1969) 
33. The Happy Hollisters and the Mystery of the Midnight Trolls  (1969) 

* Numbers 10 and 11 are sometimes switched in publication order, but Pony Hill Farm references their prior mystery about the Merry-Go-Round, so I'm listing Pony Hill Farm as #11.

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Beverly Cleary: The Ramona Series

• Main characters: Ramona Quimby, her mother and father, and her sister "Beezus"
• Setting: USA, beginning mid-20th Century
• Bold type indicates a book I've read.

1. Beezus and Ramona (1955)
2. Ramona the Pest (1968)
3. Ramona the Brave (1975)
4. Ramona and Her Father (1977)
5. Ramona and Her Mother (1979)
6. Ramona Quimby, Age 8 (1981) 
7. Ramona Forever (1984) 
8. Ramona's World (1999)

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Beverly Cleary: The Henry Huggins Series

• Main characters: Henry Huggins, his family and friends
• Setting: USA, in the 1950s and 1960s
• Bold type indicates a book I've read.

1. Henry Huggins (1950)
2. Henry and Beezus (1952)
3. Henry and Ribsy (1954)
4. Henry and the Paper Route (1957)
5. Henry and the Clubhouse (1962)
6. Ribsy (1964)

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Laura Ingalls Wilder: Little House Series

• Main characters: Laura Ingalls and her family and friends
• Setting: 19th Century America
• Bold type indicates a book I've read.

1. Little House in the Big Woods (1932)
2. Farmer Boy (1933)
3. Little House on the Prairie (1935)
4. On the Banks of Plum Creek (1937)
5. By the Shores of Silver Lake (1939)
6. The Long Winter (1940)
7. Little Town on the Prairie (1941)
8. These Happy Golden Years (1943)
9. The First Four Years (1971)

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Carolyn Keene: Nancy Drew Mysteries

● Main Characters: Nancy Drew, teenage amateur detective; her best friends Bess Marvin and George Fayne; and Nancy's father, attorney Carson Drew
● Setting: The fictional town of River Heights
● Bold type indicates a book I've read

(The Nancy Drew books have been written by a number of different writers over the years, all under the pseudonym of "Carolyn Keene." They've also been revised at various times to reflect the tastes and interests of different eras, and new stories have been added to the original series. Today, there are over a hundred titles in the series. The books listed here represent all the books I would have had access to when I started reading them as a preteen in the late 1950s, and a few from the early 1960s — so this list won't include any of the newer books added after that period.)

1. The Secret of the Old Clock  (1930) 
2. The Hidden Staircase  (1930)
3. The Bungalow Mystery  (1930) 
4. The Mystery at Lilac Inn  (1930) 
5. The Secret of Shadow Ranch  (1931) 
6. The Secret of Red Gate Farm  (1931) 
7. The Clue in the Diary  (1932) 
8. Nancy's Mysterious Letter  (1932) 
9. The Sign of the Twisted Candles  (1933)
10. The Password to Larkspur Lane  (1933) 
11. The Clue of the Broken Locket  (1934) 
12. The Message in the Hollow Oak  (1935) 
13. The Mystery of the Ivory Charm  (1936) 
14. The Whispering Statue  (1937) 
15. The Haunted Bridge  (1937) 
16. The Clue of the Tapping Heels  (1939) 
17. The Mystery of the Brass-Bound Trunk  (1940) 
18. The Mystery at the Moss-Covered Mansion  (1941) 
19. The Quest of the Missing Map  (1942) 
20. The Clue in the Jewel Box  (1943) 
21. The Secret in the Old Attic  (1944) 
22. The Clue in the Crumbling Wall  (1945) 
23. The Mystery of the Tolling Bell  (1946) 
24. The Clue in the Old Album  (1947) 
25. The Ghost of Blackwood Hall  (1948) 
26. The Clue of the Leaning Chimney  (1949) 
27. The Secret of the Wooden Lady  (1950) 
28. The Clue of the Black Keys  (1951) 
29. The Mystery at the Ski Jump  (1952) 
30. The Clue of the Velvet Mask  (1953) 
31. The Ringmaster's Secret  (1953) 
32. The Scarlet Slipper Mystery  (1954) 
33. The Witch Tree Symbol  (1955) 
34. The Hidden Window Mystery  (1956) 
35. The Haunted Showboat  (1957) 
36. The Secret of the Golden Pavilion  (1959) 
37. The Clue in the Old Stagecoach  (1960) 
38. The Mystery of the Fire Dragon  (1961) 
39. The Clue of the Dancing Puppet  (1962) 
40. The Moonstone Castle Mystery  (1963) 
41. The Clue of the Whistling Bagpipes  (1964) 
42. The Phantom of Pine Hill  (1965) 
43. The Mystery of the 99 Steps  (1966) 

Susan Cooper: The Dark Is Rising Series

This is not a typical "series." It's a five-book sequence of fantasy novels written for young people.
Main Characters: Merriman Lyon, Will Stanton
Setting: England
Bold type indicates a book I've read.

Over Sea, Under Stone (1965) [See Review]
The Dark Is Rising (1973) [See Review]
Greenwitch (1974) [See Review]
The Grey King (1975) [See Review]
Silver on the Tree (1977)

Maud Hart Lovelace: The Betsy-Tacy Books

Main Characters: Betsy Ray and her best friends for life, Tacy and Tib
Setting: Mainly Hill Street, although the later books branch out a bit
Bold type indicates a book I've read.

Betsy-Tacy (1940) [See Review]
Betsy-Tacy and Tib (1941)
Betsy and Tacy Go Over the Big Hill (1942)
Betsy and Tacy Go Downtown (1943)
Heaven to Betsy (1945)
Betsy in Spite of Herself (1946)
Betsy Was a Junior (1947)
Betsy and Joe (1948)
Betsy and the Great World (1952)
Betsy's Wedding (1955)