There are 40 books in the Longarm series. The newest book is Longarm and the Yukon Queen which came out in 2001.

1
Deputy U.S. Marshal

Book cover of Deputy U.S. Marshal
Double-barreled action—the first two Longarms in one volume! 

LONGARM

Longarm has a new mission. Ride to Crooked Lance. Pick up Cotton Younger, killer cousin of Jesse James, from the town jail. Bring him to trial. It should be easy. Except for one thing: Deputy Kincaid has already tried it. And…
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2
Longarm of the Law

Book cover of Longarm of the Law
Twice the Western adventure—two original Longarms in one volume! 

LONGARM AND THE AVENGING ANGELS

The Avenging Angels cult has stolen her away. A young Mormon beauty who’d spurned their leader’s offer of “divine”—and multiple—marriage. Now, she’s hidden somewhere in the Great Salt Lake Desert—a captive of love. And Longarm is…

3
Frontier Justice

Book cover of Frontier Justice
The fifth and sixth tales in the series deliver all the blood, bullets, and beauties Longarm lovers demand-and then some!

LONGARM IN THE INDIAN NATION
 
Bank robbery and murder bring Deputy U.S. Marshal Custis Long to the lawless borders of Oklahoma, where he takes on wild-spirited Indians, ruthless cattle rustlers,…

4
Legend with a Six-Gun

Book cover of Legend with a Six-Gun
TWO CLASSIC LONGARMS IN ONE VOLUME!

LONGARM AND THE HIGHGRADERS
 
Somebody’s stealing the highgrade ore from the Murietta Mining Company, and it’s up to Longarm to get it back. But the legendary lawman’s about to discover all that glitters is not gold—especially when it comes to a golden-haired lady rancher…

5
Longarm and the Calgary Kid

Longarm and the Calgary Kid
U.S. Deputy Marshal Custis Long--a.k.a. Longarm--heads to Colorado to question a hard-drinking outlaw suspected of murdering three train robbers, only to be kidnapped by the outlaw's lady friends and impersonated by someone masquerading as him. Original.

6
Longarm and the Hangman's Daughter

Book cover of Longarm and the Hangman's Daughter
Longarm heads to Ambush, Colorado, to investigate claims that a man convicted of murder and sentenced to hang is innocent of the crime, but his search for the truth is hampered by a professional gunslinger out to add Longarm to his list of victims. Original.

7
Longarm and the Deadly Dead Man

Book cover of Longarm and the Deadly Dead Man
Even though the newspaper proclaimed that Clay Allison, a brutal drunk and notorious outlaw, is six feet under, Longarm has his doubts when he hears rumors that someone resembling Clay has been leaving a trail of violence and blood throughout the state of Texas. Original.

8
Longarm and the Bartered Brides

Book cover of Longarm and the Bartered Brides
Custis Long must discover the truth surrounding the disappearance of several mail order brides and gets assistance from a vast array of woman, all of whom succumb to his notorious charms. Original.

9
Longarm and the Undercover Mountie

Book cover of Longarm and the Undercover Mountie
U.S. Marshal Custis Long and Royal Canadian Mountie Sergeant Foster go undercover as robbers to infiltrate Natova, a hidden town where rich outlaws can satisfy their every vice, while avoiding the law. Original.

10
Longarm and the Outlaw Empress

Book cover of Longarm and the Outlaw Empress
After thwarting a band of stagecoach bandits, Deputy U.S. Marshal Custis Long, honor-bound to bring the bandits to justice, arrives in the lawless town of Zamora where he must go up against one of the most powerful women in the West. Original.

11
Longarm and the Golden Eagle Shoot-Out

Book cover of Longarm and the Golden Eagle Shoot-Out
When Felix Gaunt, a notorious criminal, shoots a federal employee, Deputy U.S. Marshal Custis Long, out for blood, is fast on his trail, determined to exact his own special brand of justice while dealing with several other annoyances along the way. Original.

12
Longarm and the Railroad War

Longarm and the Railroad War
On a fast track to some masked mayhem...

GIANT action! GIANT adventure!

To help a railroad baron who's laying down line in Wyoming, Longarm's issuing some outlaws a one-way ticket to hell.

13
Longarm and the Ambush at Holy Defiance

Book cover of Longarm and the Ambush at Holy Defiance
Longarm GIANT novels…the biggest and best in Western adventure!

After some Arizona Rangers and U.S. marshals are bushwhacked while looking for a stolen cache of gold, it’s Longarm’s turn to ride down to the border town of Holy Defiance to find the killers and the loot.
 
At his side is…

14
Longarm and the Colorado Counterfeiter

Book cover of Longarm and the Colorado Counterfeiter
When a counterfeiter and an enticing female employee of the U.S. Treasury Department set up a booming business in bad bills, Longarm rides up into the mountains of Colorado to issue some real justice. Original.

15
Longarm and the Red-Light Ladies

Longarm and the Red-Light Ladies
With Mallory's gang targeting silver shipments and killing anyone who gets in their way, including Longarm's latest lady friend, the U.S. marshal embarks on a trail of vengeance that leads to the lawless town of Galena City controlled by the outlaws. Original.

16
Longarm and the Kansas Jailbird

Longarm and the Kansas Jailbird
U.S. Marshall Long risks his life and career to clear the name of fellow lawman Norman Wold, who has been framed for a crime that he did not commit. Original.

17
Longarm and the Devil's Sister

Longarm and the Devil's Sister
When a courtroom jailbreak interrupts the murder trial of Devil Dave Devereux, leaving several innocent bystanders dead, a vengeful Longarm embarks on a search for the missing killer in order to exact his own brand of justice. Original.

18
Longarm and the Vanishing Virgin

Longarm and the Vanishing Virgin
Longarm is called in by a U.S. senator to investigate the mysterious disappearance of his fiance+a7e, Nora Canady, but Longarm's search for the missing woman stirs up some unexpected, and dangerous, consequences. Original.

19
Longarm and the Diary of Madame Velvet

Longarm and the Diary of Madame Velvet
U.S. Marshal Custis Long finds himself in over his head when a pretty lady lawyer enlists his aid to protect her two spinster clients after they inherit a former whorehouse and a collection of journals that could destroy the reputations of some very important men. Original.

20
Longarm and the Four Corners Gang

Longarm and the Four Corners Gang
Longarm likes to work alone, but when a beautiful woman with near-perfect aim volunteers throws in her rifle to help him catch a gang of vicious outlaws, how can he turn her down? Original.

21
Longarm in the Valley of Sin

Longarm in the Valley of Sin
A spa doctor has received some frightening death threats, and Longarm is determined to root out the troublemaker. Original.

22
Longarm and the Redhead's Ransom

Longarm and the Redhead's Ransom
When Fiona Palmer is abducted on her honeymoon by El Pico, a notorious Mexican bandit and revolutionary who demands a ransom in firearms, her family threatens to cause an international incident by sending a posse across the border to save her, and it is up to Deputy U.S. Marshal Long…

23
Longarm and the Mustang Maiden

Book cover of Longarm and the Mustang Maiden
Trapped in the mountains having lost his memory temporarilly, Longarm must trust a beautiful woman with his life or else face off against the Haskill gang before he is ready. Original.

24
Longarm and the Nevada Belly Dancer

Book cover of Longarm and the Nevada Belly Dancer
In the wake of a bank robbery gone wrong, three of four bandits are dead and the lone survivor is on the loose hoping to reclaim the missing loot. Original.

25
Longarm and the Black Widow

Book cover of Longarm and the Black Widow
U.S. Marshall Custis Long journeys to Colorado to investigate the murders of a U.S. senator and a messenger transporting top-secret documents and comes face to face with the senator's sultry but deadly wife, known as the Black Widow because of the deaths of so many of her family members. Original.

26
Longarm and the Church Ladies

Book cover of Longarm and the Church Ladies
While escorting a group of Christian Cherokee down to Mexico, Longarm finds himself up against a gang of banditos, nosy Texas Rangers, the Mexican police, and a tempting array of sultry beauties. Original.

27
Longarm and the Golden Goddess

Book cover of Longarm and the Golden Goddess
Longarm's job as bodyguard to an Englishman is complicated by the man's beautiful niece, who seems to have a remarkable effect on the men around her. Original.

28
Longarm on a Bloody Vendetta

Longarm on a Bloody Vendetta
Preparing to settle down as a Colorado cattle rancher with a beautiful new wife with a young son, U.S. Marshal Long finds his joy turned to grief when his bride-to-be is killed in a robbery gone wrong and sets out as a one-man execution squad to even the score on…

29
Longarm and the Love Sisters

Book cover of Longarm and the Love Sisters
Longarm is given the unenviable assignment of guarding the president's activist granddaughter and her wealthy, spoiled friends, who are planning an undercover mission to help underprivileged women, a mission that is further complicated by the presence of the young ladies' tempting chaperone, Big Mamma. Original.

30
Longarm and the Wayward Widow

Book cover of Longarm and the Wayward Widow
Longarm is sent to New Mexico to intervene when a long-standing feud between Tom McCabe and Don Alejandro Montoya over land erupts in murder, but his mission could be jeopardized by an all-too-enchanting widow. Original.

31
Longarm and the Mountain Bandit

Book cover of Longarm and the Mountain Bandit
While journeying through Mosquito Pass in the Arkansas mountain in hot pursuit of a murderous outlaw who robbed a group of postmen, Longarm encounters the two lovely--and lonely--Shreave sisters at the local inn. Original.

32
Longarm and the Nevada Slasher

Book cover of Longarm and the Nevada Slasher
U.S. Marshal Custis Long and his inexperienced apprentice, young Dudley Applewhite, head to Nevada to track down a vicious killer responsible for a series of slashing murders of local prospectors. Original.

33
Longarm and the Horse Thief

Book cover of Longarm and the Horse Thief
U.S. Marshal Long ventures deep into Indian territory to flush out murderous horse thief Henry Starr, a vicious half-Cherokee outlaw who specializes in horse rustling. Original.

34
Longarm and the Lady Bandit

Longarm and the Lady Bandit
An encounter with the lovely Alvina Lockwood leads to trouble for U.S. Marshal Custis Long when she draws him into a plot to free her not-so-innocent brother from jail and into a search for a luscious female bandit known as Kansas Red. Original.

35
Longarm and the Scorpion Murders

Book cover of Longarm and the Scorpion Murders
Custis T. Long has plenty he’d rather be doing than investigating an old friend on a brand-new murder charge. But just as he’s leaving for a visit to a pretty little Santa Fe senorita, a case comes up that he can’t turn down. It seems his mentor, Jesse Jerome, is…

36
Longarm and the Six-Gun Senorita

Longarm and the Six-Gun Senorita
Hoping to recover a cache of stolen Army rifles that has been smuggled across the border into Mexico, Longarm becomes caught in the middle of an uncooperative Texas ranger, a hot-tempered ranch hand, and a sensuous schoolteacher hiding some very dangerous secrets. Original.

37
Longarm and the Gunshot Gang

Book cover of Longarm and the Gunshot Gang
Longarm heads for a little town in the untamed region near the Grand Canyon to take on a gang of vicious outlaws stirring up trouble in the area. Original.

38
Longarm and the Denver Execution

Book cover of Longarm and the Denver Execution
When a dying outlaw decides to confess about his involvement in a deadly bank holdup that had occurred five years earlier, Longarm finally gets the chance to find the killers who had slaughtered a host of innocents at a Denver bank in order to hide their identities. Original.

39
Longarm and the Widow's Spite

Book cover of Longarm and the Widow's Spite
No one is mourning the death of hard-living bully Cracker Marner, shot down in the local saloon, but U.S. Marshal Long gets involved when it appears that Cracker's vengeful widow and mother are out to even the score, no matter what it takes. Original.

40
Longarm and the Yukon Queen

Book cover of Longarm and the Yukon Queen
U.S. Deputy Marshal Long's search for missing witness Harrison Dodge sends him on a dangerous journey to Alaska aboard the Yukon Queen, a riverboat under the command of a fiery and seductive lady captain. Original.