| Issue | Cover Appearance | Comment | Reprinted |
| All-American #19 | No | (no title) - First Appearance and Origin, I; Joe Morgan | Secret Origins of DC Super-Heroes,1978 |
| All-American #20 | No | (no title) - First Appearance in Costume, thwarts jewelry theives at a local ball | |
| All-American #21 | No | (no title) - A crazed man and his brutish thugs kidnap a group of Calvin College students from a school picnic with the intention of enslaving them until he is thwarted by the Atom. | |
| All-American #22 | No | (no title) - breaks up the Albano Gang as it extorts protection money from the family of "Truck" Tarbell | |
| All-American #23 | No | (no title) - vs Nada, a crooked hynpotist who frames Joe Morgan | |
| All-American #24 | No | (no title) - "Slink" & his boss run a protection racket target at shoe-shine boys and other kids working the street | Flashback #30 |
| All-American #25 | No | (no title) - Earl Evans & gang (bank robbers) kidnap Mary James and hole up in body shop | |
| All-American #26 | No | (no title) - breaks up a gambling ring extorting money from a Calvin College professor | |
| All-American #27 | No | (no title) - clears the name of James Baker, framed for arson | |
| All-American #28 | No | (no title) - 1st date with Mary James, vs. gang of fur hijackers | |
| All-American #29 | No | (no title) - prevents sabotage at a local steel mill | |
| All-American #30 | No | (no title) - while visiting Joe Morgan's health camp, the Atom foils graft at reform school | |
| All-American #31 | No | (no title) - vs escaped convicts while on vacation at dude ranch | |
| All-American #32 | No | (no title) - defeats an attempt by criminals to revive the cult of Kali | |
| All-American #33 | No | (not title) - vs. the Cootie gang which has stolen a metal-dissolving formula | |
| All-American #34 | No | (no title) - breaks up ring of defense bond counterfeiters | |
| All-American #35 | No | (no title) - while on a Christmas visit to New York, Atom thwarts an attemt by Nazi agents to blow up the Statue of Liberty | |
| All-American #36 | No | (no title) - takes up baby-sitting job and then captures kidnappers who take the babies in his care | |
| All-American #37 | No | (no title) - thwarts crooked car racket | |
| All-American #38 | No | (no title) - captures Axis agents who murder an Army Intelligence Officer for some secret airplane schematics | |
| All-American #39 | No | (no title) - captures gangsters disrupting egg and dairy commerce in Calvin City | |
| All-American #40 | No | (no title) - vs. The Tusk, a costumed criminal avenging himself on his swindling business partners | |
| All-American #41 | No | (no title) - captures an agent of the Japanese Black Dragon Society | |
| All-American #42 | No | "Strange Case of the Disappearing Books" - solves theft of antique books | |
| All-American #43 | No | "Carnival of Crime" - captures crooks at carnival | |
| All-American #44 | No | "The Hungry Horse" - thwarts crooks stealing radium | |
| All-American #45 | No | "The Gallant Gambler" - The Atom risks life to help gambler | |
| All-American #46 | No | "The Little Men" - short men become terrorists to get respect | |
| All-American #48 | No | (no title) - thwarts crime while looking for a summer job as a reporter | |
| All-American #49 | No | "The Cowboy and the Atom" - captures crooks on a dude ranch | |
| All-American #50 | No | "The Atom is Dead" - vs. Moustache Max | |
| All-American #51 | No | "Guadzaloope Ball" - I: Perry Poodle, a classmate of Al's invents a baseball which he can control and falls afoul of crooks | |
| All-American #52 | No | "The Loneliest Man in the World" - clears the name of a defrauded medical scientist | |
| All-American #53 | No | "Colors and Crime" - captures crooks after a Hay Fever cure | |
| All-American #54 | No | (no title) - disguises himself as a crook to infiltrate a gang | |
| All-American #55 | No | "The Criminal Clocks" - thieves hide jewels in clocks | |
| All-American #56 | No | "The Friendship Dance" - solves mystery at dance | |
| All-American #57 | No | "The Atom vs Nick Crock" - vs Nick Crock | |
| All-American #58 | No | "Gangsters, Girls and Guns" - captures Dude Hendrick, impresses sorority | |
| All-American #59 | No | (no title) - helps collge classmate when his guardian screws him out his inheritance | |
| All-American #60 | No | (no title) - Basil & Boris, Novice criminals | |
| All-American #61 | No | "Van Dorra's Box" - former safe-cracker's son is kdnapped and Atom must rescue the son and keep the father's name clear | |
| All-American #70 | No | "The Education of Stacy Hogan" - teaches his cousin Stacy not to imitate criminals | |
| All-American #71 | No | "Virtue Is It's Own Reward" - thwarts timber thieves and recovers a document written by George Washington | |
| All-American #72 | No | (no title) - vs. Boss, henchmen Slugger and Duke | |
| Big All-American Comics #1 | Yes | "Putting on the Dog" - thwarts jewel theives taking advantage of a dog lover | |
| Comic Cavalcade #22 | No | "The Bloodhound Compass" - bails out Perry Poodle after his new invention bring him into trouble with crooks | |
| Comic Cavalcade #23 | No | "The Most Popular Hat in the World" - captures crooks smuggling gems in a hat | |
| Comic Cavalcade #28 | No | "Mystery of the Midway Tunnel" - foils crooks sabotaging tunnel construction | |
| Flash Comics #80 | No | "Jack and the Green Walk" - helps local kid get a job and thwart crime | |
| Flash Comics #82 | No | "The Talking Statue" - vs. counterfeiters, A: Perry Poodle | |
| Flash Comics #83 | No | "The Atom's Rest Cure" - solves crime at nightclub | |
| Flash Comics #87 | No | "Al Pratt's Problem" - wraps aup crime while struggling with college essay | |
| Flash Comics #89 | No | "The Waltzing Crooks" - | |
| Flash Comics #90 | No | "Murder on a Star" - Man murders then impersonates sister | DC 100-Page Spectacular #18 |
| Flash Comics #91 | No | "Double Dilemma" - solves a frame job on the Atom | |
| Flash Comics #92 | No | "Carnival of Crime" - solves crime at winter carnvial | |
| Flash Comics #93 | No | "The Mystery of the Cabinets" - vs Mandini the Magician | |
| Flash Comics #94 | No | "Driveway for Crime" - thwarts bank robbers who have kidnapped Mary James and wired her to the bank alarm | |
| Flash Comics #95 | No | "Mystery of the Smiling Balloons" - vs. crooks with a diamond magnet | |
| Flash Comics #97 | No | "Winner Takes All" - thwarts crime at collegiate boat race | |
| Flash Comics #98 | No | "Terror Rides the Rails" - New costume, stops railroad saboteurs | Justice League of America #99 |
| Flash Comics #99 | No | "Disaster at Hairpin Turn" - defeats criminal trying to spoil miniature auto race | |
| Flash Comics #100 | No | "The Bullet-Eater" - helps scientist against crooks after a plastic ray | |
| Flash Comics #102 | No | "The Sneezing Statues" - captures crooks disguised as statues | |
| Flash Comics #103 | No | "The Rock Crushers" - captures crooks using a water truck filled with rocks to assist them in crime | |
| Flash Comics #104 | No | "The Vanishing Lighthouse" - defeats crooks that ground ships then rob them | |
| Sensation #86 | No | "The Undersea Raiders" - defeats scavengers trying to sink ships, wears his newer costume |