JC
John Costello — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Worcester-County, Massachusetts
Our Model Tree links this John Costello across the 1920, 1930 and 1940 US Censuses in Worcester-County, Massachusetts (XGBoost, ~Confirmed) — first a head (b.~1890), then head of a 5-person household.
Age 50
b. ~1890
Male
Head
Born: Ireland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Worcester-County, Massachusetts |
| Surname | Costello |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Fitchburg |
| 1935 Residence (County) | Worcester |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Paper Finisher |
| Industry | Paper Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1000 |
| Highest Grade | No 6 |
| 1935 Residence | Same Place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Occupation | Paper Finisher |
| Township / Ward | Fitchburg |
| Est. Birth Year | ~1890 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Costello | Head | — | 50 | ~1890 |
| Anne Costello | Daughter | — | 3 | ~1937 |
| Mary Costello | Spouse | — | 42 | ~1898 |
| Marie Costello | Daughter | — | 13 | ~1927 |
| John Costello | Son | — | 16 | ~1924 |
Census Appearances
1920
Worcester, Massachusetts
Other, age 26
Worcester, Massachusetts · implied b. ~1894 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | John |
| Relationship to Head | boarder |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Ireland |
| Year of Immigration | 1914 |
| Naturalization Status | Alien |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | papermaker |
| Industry | paper mill |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1930
Worcester, Massachusetts
Head, age 40
Worcester, Massachusetts · implied b. ~1890 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Costello |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Ireland |
| Naturalization Status | First papers filed |
| Year of Immigration | 1915 |
| Age at First Marriage | 32 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Instructor |
| Industry | Playground |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | Free State |
| Home Owned/Rented | un |
| Home Value / Rent | un |
| Veteran | No |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Worcester-County, Massachusetts
Head, age 50
Worcester-County, Massachusetts · implied b. ~1890 — 5 household members
| Surname | Costello |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Fitchburg |
| 1935 Residence (County) | Worcester |
| Naturalization Status | Naturalized |
| Occupation | Paper Finisher |
| Industry | Paper Mill |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1000 |
| Highest Grade | No 6 |
| 1935 Residence | Same Place |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
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 Costello across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Costello
Head · 1940 · age 50 · b. ~1890 · 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 — Worcester-County, Massachusetts
Open full size
1940 US Federal Census — Worcester-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01647-00685)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marian L. Maloney | 6 | Daughter | — | Massachusetts |
| 2 | William H. Sullivan | 51 | Head | Dresser Tender | Massachusetts |
| 3 | Elizabeth A. Sullivan | 53 | Wife | — | Massachusetts |
| 4 | Patrick J. Griffin | 73 | Head | Paper Maker | Ireland |
| 5 | Dorothy Griffin | 25 | Daughter | Poultry Worker | Massachusetts |
| 6 | Edward J. Woods | 38 | Head | Const. Clerk | Massachusetts |
| 7 | Blanche D. Woods | 37 | Wife | — | Massachusetts |
| 8 | Edward J. Jr. Woods | 2 | Son | — | Massachusetts |
| 9 | Mary C. O'Brien | 52 | Head | — | Massachusetts |
| 10 | Anne B. O'Brien | 50 | Sister | Stenographer | Massachusetts |
| 11 | William E. Daulton | 57 | Head | Treasurer | Massachusetts |
| 12 | Evelyn E. Daulton | 51 | Wife | — | Massachusetts |
| 13 | Helen Daulton | 17 | Daughter | Hair Dresser | Massachusetts |
| 14 | Mary Murphy | 53 | Head | — | Massachusetts |
| 15 | Margaret Murphy | 24 | Daughter | Polisher | Massachusetts |
| 16 | Frederick Collins | 68 | Lodger | Hotelman | England |
| 17 | Robert Beattie | 21 | Lodger | Dipper | New York |
| 18 | Joseph Murphy | 26 | Head | Laborer | Massachusetts |
| 19 | Lillian Murphy | 21 | Wife | — | Massachusetts |
| 20 | Joan Murphy | 2 | Daughter | — | Massachusetts |
| 21 | Janice Murphy | 0 | Daughter | — | Massachusetts |
| 22 | Henry Dauphinais | 48 | Head | Insurance Agt. | Canada |
| 23 | Eva Dauphinais | 48 | Wife | — | Massachusetts |
| 24 | Leonard Dauphinais | 17 | Son | — | Massachusetts |
| 25 | Francis Dauphinais | 10 | Son | — | Massachusetts |
| 26 | Leonard Aldrich | 55 | Head | Roofer | Massachusetts |
| 27 | Nettie Donell | 48 | Housekeeper | Housework | Vermont |
| 28 | Florence Donell | 17 | Daughter | — | Massachusetts |
| 29 | Eleanor Donell | 12 | Daughter | — | Massachusetts |
| 30 | Raymond J. Dauphinais | 36 | Head | Paper Maker | Massachusetts |
| 31 | Margaret Dauphinais | 31 | Wife | — | Massachusetts |
| 32 | John J. Costello THIS PERSON | 50 | Head | Paper Finisher | Ireland |
| 33 | Mary Costello | 42 | Wife | — | Ireland |
| 34 | John P. Costello | 16 | Son | — | Massachusetts |
| 35 | Marie Costello | 13 | Daughter | — | Massachusetts |
| 36 | Anne Francis Costello | 3 | Daughter | — | Massachusetts |
| 37 | Fred Morin | 53 | Head | Laborer | Massachusetts |
| 38 | Ida E. Morin | 53 | Wife | — | Canada |
| 39 | Doris Morin | 16 | Daughter | — | Massachusetts |
| 40 | Francis P. Morin | 11 | Son | — | Massachusetts |
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)