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John Regan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Custer-County, Montana
Our Model Tree links this John Regan across the 1920, 1930 and 1940 US Censuses in Custer-County, Montana (XGBoost, ~Confirmed), with identified parents James & James — first a son (b.~1912), then head of a 4-person household.
Age 28
b. ~1912
Male
Son
Born: Montana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Custer-County, Montana |
| Surname | Regan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | Miles City |
| 1935 Residence (County) | Custer |
| Additional Details | |
| Occupation | plumber |
| Industry | private practice |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 1500 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Occupation | Plumber |
| Township / Ward | Miles City |
| Est. Birth Year | ~1912 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Robert Regan | Son | — | 24 | ~1916 |
| Mary Regan | Spouse | — | 54 | ~1886 |
| John Regan | Son | — | 28 | ~1912 |
| James Regan | Head | — | 58 | ~1882 |
Census Appearances
1920
Custer, Montana
Son, age 8
Custer, Montana · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Regan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Custer, Montana
Son, age 18
Custer, Montana · implied b. ~1912 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Regan |
| Given Name | John Francis |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Occupation | App. Plumber |
| Industry | Plumbing Shop |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Custer-County, Montana
Son, age 28
Custer-County, Montana · implied b. ~1912 — 4 household members
| Surname | Regan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | Miles City |
| 1935 Residence (County) | Custer |
| Occupation | plumber |
| Industry | private practice |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 1500 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 John Regan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father James Regan (~0.92 confidence) and father James Regan (~0.92 confidence) and father James Regan (~0.92 confidence) and mother Mary Regan (~0.92 confidence) and mother Mary Regan (~0.92 confidence) and mother Nancy Regan (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Regan
b. ~1882
Source father
● Household
· direct · ~0.92
Father
James Regan
b. ~1882
Source father
● Household
· direct · ~0.92
Father
James Regan
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Mary Regan
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Mary Regan
b. ~1886
Source mother
● Household
· direct · ~0.92
Mother
Nancy Regan
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Regan
Son · 1940 · age 28 · b. ~1912 · Montana
★ You are viewing this record
Sibling
Robert Regan
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Custer-County, Montana
Open full size
1940 US Federal Census — Custer-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02216-00475)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William White | 36 | Head | Revenue Collector | South Dakota |
| 42 | Jean White | 31 | Wife | — | Montana |
| 43 | Harry Horsford | 28 | Head | Truck Driver | Montana |
| 44 | Louise Horsford | 27 | Wife | Teacher | Idaho |
| 45 | John Horsford | 0 | Son | — | Montana |
| 46 | Seth Dundas | 44 | Head | Wholesale Grocery | Iowa |
| 47 | Mary Dundas | 29 | Wife | — | Montana |
| 48 | Hamilton Gordon | 28 | Head | Business Manager | New Jersey |
| 49 | Margaret Gordon | 27 | Wife | — | Kansas |
| 50 | Jack Thomas | 41 | Head | Patrolman | Illinois |
| 51 | Edna Thomas | 38 | Wife | — | Montana |
| 52 | James E. Regan | 58 | Head | Master Plumber | Montana |
| 53 | Mary Regan | 54 | Wife | — | Montana |
| 54 | John Regan THIS PERSON | 28 | Son | Plumber | Montana |
| 55 | Robert Regan | 24 | Son | Plumber | Montana |
| 56 | Roy Machin | 52 | Head | Cement Mixer Operator | North Dakota |
| 57 | Viola Machin | 45 | Wife | — | North Dakota |
| 58 | Lawrence Machin | 20 | Son | Salesman | North Dakota |
| 59 | Rose Machin | 17 | Daughter | — | North Dakota |
| 60 | Agnes Machin | 14 | Daughter | — | North Dakota |
| 61 | Norman Machin | 10 | Son | — | North Dakota |
| 62 | Victor Dergant | 23 | Head | Carpenter | Minnesota |
| 63 | Echo Dergant | 20 | Wife | — | Montana |
| 64 | Charles Allen | 51 | Head | Sheriff | Texas |
| 65 | Lydia Allen | 45 | Wife | — | Indiana |
| 66 | Edna M. Allen | 21 | Daughter | Chambermaid | Montana |
| 67 | Betty J. Allen | 18 | Daughter | — | Montana |
| 68 | James Lowe | 21 | Step-son | Bookkeeper | Indiana |
| 69 | Bernice Lowe | 18 | Step-daughter | — | Montana |
| 70 | Betty Lowe | 18 | Step-daughter | — | Montana |
| 71 | Harry Griffith | 48 | Head | Proprietor | Illinois |
| 72 | Lelia Griffith | 37 | Wife | — | Minnesota |
| 73 | Hazel Griffith | 12 | Daughter | — | Montana |
| 74 | Harry Jr. Griffith | 6 | Son | — | Montana |
| 75 | Russell L. Brown | 31 | Head | Trucking Foreman | Ohio |
| 76 | Jacqueline Brown | 26 | Wife | Clerk | Washington |
| 77 | Russell Jr. Brown | 4 | Son | — | Washington |
| 78 | Mary Brown | 3 | Daughter | — | Washington |
| 79 | Raymond Sundby | 30 | Head | Proprietor | North Dakota |
| 80 | Dorothy Sundby | 22 | Wife | — | Iowa |
Pedigree Summary
John + 1 sibling
Gen 1 · 6 parents
~0.92
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)