JM
James Mcmahon — 1940 US Census Record
Model Tree available1940 United States Federal Census · Natrona-County, Wyoming
Our Model Tree links this James Mcmahon across the 1920, 1930 and 1940 US Censuses in Natrona-County, Wyoming (XGBoost, ~Confirmed), with identified parents James & James — first a son (b.~1903), then head of a 2-person household.
Age 37
b. ~1903
Male
Son
Born: Wyoming
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Natrona-County, Wyoming |
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Wyoming |
| 1935 Residence (City) | Casper |
| 1935 Residence (County) | Natrona |
| Additional Details | |
| Class of Worker | 8 |
| Hours Worked | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same place |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
| Township / Ward | Casper |
| Est. Birth Year | ~1903 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to James | Age | Birth yr |
|---|---|---|---|---|
| Catherine Mcmahon | Head | — | 33 | ~1907 |
| James Mcmahon | Son | — | 37 | ~1903 |
Census Appearances
1920
Converse, Wyoming
Son, age 15
Converse, Wyoming · implied b. ~1905 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Wyoming |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
1930
Natrona, Wyoming
Son, age 26
Natrona, Wyoming · implied b. ~1904 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McMahon |
| Given Name | James R |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Wyoming |
| Father's Birthplace | Illinois |
| Mother's Birthplace | New York |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
1940
Natrona-County, Wyoming
Son, age 37
Natrona-County, Wyoming · implied b. ~1903 — 2 household members
| Surname | McMahon |
| Given Name | James |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Single |
| Birthplace | Wyoming |
| 1935 Residence (City) | Casper |
| 1935 Residence (County) | Natrona |
| Class of Worker | 8 |
| Hours Worked | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same place |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links James Mcmahon across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: father James Mcmahon (~0.92 confidence) and father James Mcmahon (~0.92 confidence) and mother Katherine Mcmahon (~0.92 confidence) and mother Catherine Mcmahon (~0.50 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.82
Father
James Mcmahon
b. ~1861
Source father
● Household
· direct · ~0.92
Father
James Mcmahon
b. ~1862
Source father
● Household
· direct · ~0.92
Mother
Katherine Mcmahon
b. ~1882
Source mother
● Household
· direct · ~0.92
Mother
Catherine Mcmahon
b. ~1907
Source mother
● Household
· direct · ~0.5
This person
Anchor record
James Mcmahon
Son · 1940 · age 37 · b. ~1903 · Wyoming
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Natrona-County, Wyoming
Open full size
1940 US Federal Census — Natrona-County, Wyoming
Page Contents
15 people indexed on this census page (nara:1940:m-t0627-04573-00552)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Catherine Mcmahon | 33 | Head | Seamstress | New York |
| 42 | James Mcmahon THIS PERSON | 37 | Son | — | Wyoming |
| 43 | James Wickland | 48 | Head | Attendant | Norway |
| 44 | Louis C. Wickland | 52 | Brother | Pipe Builder | Norway |
| 45 | Peter Alamos | 40 | Head | Laborer | Mexico |
| 46 | Ray Bryan | 45 | Head | Shop Teacher | Wyoming |
| 47 | Marie Bryan | 28 | Wife | — | Nebraska |
| 48 | Mary Jo Bryan | 9 | Daughter | — | Wyoming |
| 49 | Mary Sager | 74 | Mother | — | Iowa |
| 50 | Henry Taylor | 69 | Head | Plasterer | Missouri |
| 51 | George Hustulakis | 53 | Head | Pool Dealer | Greece |
| 52 | Grace E. Westerfield | 48 | Roomer | Maid | Missouri |
| 53 | Edward F. Fish | 30 | Head | Accountant | Ohio |
| 54 | Iris Fish | 33 | Wife | — | Kansas |
| 55 | P. H. Mattox | 50 | Head | Laborer | Indiana |
Pedigree Summary
James
Gen 1 · 4 parents
~0.81
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)