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John Monahan — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this John Monahan across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1880), then head of a 4-person household.
Age 60
b. ~1880
Male
Head
Born: Vermont
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Vermont |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | trainman |
| Industry | passenger |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1975 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
| Occupation | Trainman |
| Township / Ward | Boston |
| Est. Birth Year | ~1880 |
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 Monahan | Son | — | 21 | ~1919 |
| Katherine Monahan | Daughter | — | 29 | ~1911 |
| Ella Monahan | Spouse | — | 59 | ~1881 |
| John Monahan | Head | — | 60 | ~1880 |
Census Appearances
1920
Suffolk, Massachusetts
Head, age 40
Suffolk, Massachusetts · implied b. ~1880 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | John S |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Vermont |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Brakeman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
1930
Suffolk, Massachusetts
Head, age 50
Suffolk, Massachusetts · implied b. ~1880 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Monahan |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Vermont |
| Age at First Marriage | 26 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Trainman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 35 |
| Radio Set | R |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
1940
Suffolk-County, Massachusetts
Head, age 60
Suffolk-County, Massachusetts · implied b. ~1880 — 4 household members
| Surname | Monahan |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Vermont |
| 1935 Residence (City) | Boston |
| 1935 Residence (County) | Suffolk |
| Occupation | trainman |
| Industry | passenger |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1975 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Vermont |
| Birth Country | United States |
| Birthplace (normalized) | vermont |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
John Monahan
Head · 1940 · age 60 · b. ~1880 · Massachusetts
★ 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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01675-00893)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Harkins | 20 | Son | New Worker | Mass |
| 2 | Charles Harkins | 19 | Son | Accountant | Mass |
| 3 | Agnes Harkins | 17 | Daughter | New Worker | Mass |
| 4 | Mary Harkins | 17 | Daughter | — | Mass |
| 5 | Leonard T. Gleason | 42 | Head | Printer | Mass |
| 6 | Helen G. Gleason | 40 | Wife | — | Mass |
| 7 | Thomas Gleason | 14 | Son | — | Mass |
| 8 | Mary Gleason | 12 | Daughter | — | Mass |
| 9 | Peter Farrell | 47 | Head | Rug Dealer | Armenia |
| 10 | Marie Farrell | 38 | Wife | — | Mass |
| 11 | Alice Farrell | 18 | Daughter | — | Mass |
| 12 | Agnes Farrell | 64 | Mother | — | Armenia |
| 13 | Simon Goshgarian | 52 | Head | Presser | Armenia |
| 14 | Alice Goshgarian | 45 | Wife | — | Armenia |
| 15 | Varsenig Goshgarian | 26 | Daughter | Clerk | Armenia |
| 16 | Margaret Goshgarian | 18 | Daughter | — | Mass |
| 17 | Peter Goshgarian | 13 | Son | — | Mass |
| 18 | Joseph Goshgarian | 7 | Son | — | Mass |
| 19 | John Monahan THIS PERSON | 60 | Head | Trainman | Vermont |
| 20 | Ella Monahan | 59 | Wife | — | Mass |
| 21 | Katherine Monahan | 29 | Daughter | Stenographer | Mass |
| 22 | Robert Monahan | 21 | Son | Truck Driver | Mass |
| 23 | Alice Clark | 40 | Head | — | Mass |
| 24 | Robert E. Clark | 19 | Son | — | Mass |
| 25 | Ethel Clark | 15 | Daughter | — | Mass |
| 26 | Lorraine Clark | 12 | Daughter | — | Mass |
| 27 | Gertrude Clark | 8 | Daughter | — | Mass |
| 28 | Paul Clark | 4 | Son | — | Mass |
| 29 | Henry Loach | 38 | Head | Traveling Salesman | Mass |
| 30 | Christian Loach | 37 | Wife | — | Mass |
| 31 | Mildred Loach | 13 | Daughter | — | Mass |
| 32 | Henry Loach | 12 | Son | — | Mass |
| 33 | Leo Belliveau | 45 | Head | Shipwright | Canada-French |
| 34 | Katherine Belliveau | 39 | Wife | — | England |
| 35 | George Hughes | 34 | Head | Service Manager | Mass |
| 36 | Catherine Hughes | 29 | Wife | — | Mass |
| 37 | Richard Cameron | 30 | Head | Stone Man | Mass |
| 38 | Catherine Cameron | 29 | Wife | — | New York |
| 39 | Katherine Cameron | 2 | Daughter | — | Mass |
| 40 | Edward Graham | 23 | Head | Equipment Installer | Mass |
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)