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John Monahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Deer-Lodge-County, Montana
Our Model Tree links this John Monahan across the 1930 and 1940 US Censuses in Deer-Lodge-County, Montana (XGBoost, ~Confirmed) — first a head (b.~1896), then head of a 8-person household.
Age 44
b. ~1896
Male
Head
Born: Montana
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Deer-Lodge-County, Montana |
| Surname | Monahan |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Montana |
| 1935 Residence (City) | Anaconda |
| 1935 Residence (County) | Deer Lodge |
| Additional Details | |
| Occupation | Custodian |
| Industry | Public Library |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1640 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Occupation | Custodian |
| Township / Ward | Anaconda |
| Est. Birth Year | ~1896 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Monahan | Son | — | 10 | ~1930 |
| Margaret Monahan | Daughter | — | 12 | ~1928 |
| William Monahan | Son | — | 4 | ~1936 |
| John Monahan | Head | — | 44 | ~1896 |
| Mary Monahan | Daughter | — | 14 | ~1926 |
| Grace Monahan | Spouse | — | 36 | ~1904 |
| Frank Monahan | Son | — | 18 | ~1922 |
| Patricia Monahan | Daughter | — | 16 | ~1924 |
Census Appearances
1930
Deer Lodge, …
Head, age 34
Deer Lodge, Montana · implied b. ~1896 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Montana |
| Age at First Marriage | 25 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Switchman |
| Industry | Electric Railway |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 32 |
| Veteran | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Deer-Lodge-County, Montana
Head, age 44
Deer-Lodge-County, Montana · implied b. ~1896 — 8 household members
| Surname | Monahan |
| Given Name | John L. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Montana |
| 1935 Residence (City) | Anaconda |
| 1935 Residence (County) | Deer Lodge |
| Occupation | Custodian |
| Industry | Public Library |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 1640 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| 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 Monahan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Monahan
Head · 1940 · age 44 · b. ~1896 · Montana
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Deer-Lodge-County, Montana
Open full size
1940 US Federal Census — Deer-Lodge-County, Montana
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-02217-00662)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Elena L. Walsh | 28 | Wife | — | Montana |
| 42 | Peter P. Sweedish | 39 | Head | Lead Burner | Montana |
| 43 | Edna Sweedish | 26 | Wife | Waitress | Montana |
| 45 | Mary Yelovich | 48 | Head | — | Yugoslavia |
| 46 | John Yelovich | 25 | Son | General Laborer | Montana |
| 47 | Nick Yelovich | 22 | Son | Section Hand | Montana |
| 48 | Dragie Yelovich | 18 | Daughter | — | Montana |
| 49 | Natalia Yelovich | 16 | Daughter | — | Montana |
| 50 | Sara Whiker | 54 | Head | — | England |
| 51 | Hayner W. Whiker | 22 | Son | Furnageman Helper | Arizona |
| 52 | Helen Mcneil | 50 | Head | — | Montana |
| 53 | Keith H. Mcneil | 26 | Son | Millman | Idaho |
| 54 | John L. Monahan THIS PERSON | 44 | Head | Custodian | Montana |
| 55 | Grace A. Monahan | 36 | Wife | — | Montana |
| 56 | Frank J. Monahan | 18 | Son | New Worker | Montana |
| 57 | Patricia A. Monahan | 16 | Daughter | — | Montana |
| 58 | Mary E. Monahan | 14 | Daughter | — | Montana |
| 59 | Margaret Monahan | 12 | Daughter | — | Montana |
| 60 | John L. Jr. Monahan | 10 | Son | — | Montana |
| 61 | William E. Monahan | 4 | Son | — | Montana |
| 62 | Clyde E. Walter | 54 | Head | General Laborer | Missouri |
| 63 | Vera Walter | 21 | Wife | — | Montana |
| 64 | Clyde A. Walter | 1 | Son | — | Montana |
| 65 | Mary Evich | 46 | Head | — | Yugoslavia |
| 66 | Mildred Evich | 23 | Daughter | Seamstress | Montana |
| 67 | Willie Evich | 19 | Son | Research Asst | Washington |
| 68 | Donnie Evich | 17 | Daughter | — | Washington |
| 69 | Michael Kovich | 48 | Lodger | Miner | Yugoslavia |
| 70 | Michael Chavala | 54 | Head | General Laborer | Yugoslavia |
| 71 | Sam Stefanich | 59 | Head | General Laborer | Yugoslavia |
| 72 | Frank Stenson | 62 | Head | General Laborer | Missouri |
| 73 | Anton Teganac | 59 | Head | General Laborer | Austria |
| 74 | Roderick D. Kaser | 30 | Head | Truck Driver | South Dakota |
| 75 | Thomas M. Green | 33 | Head | Truck Driver | South Dakota |
| 76 | James J. Reardon | 50 | Head | Ironworker | Montana |
| 77 | Charlotte M. Reardon | 42 | Wife | — | Montana |
| 78 | Eleanor C. Reardon | 23 | Daughter | Stenographer | Montana |
| 79 | Rita J. Reardon | 21 | Daughter | New Worker | Montana |
| 80 | James J. Jr. Reardon | 17 | Son | — | Montana |
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)