JC
John Carlson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this John Carlson across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Ernest & Amanda — first a head (b.~1902), then head of a 5-person household.
Age 38
b. ~1902
Male
Head
Born: Massachusetts
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Carlson |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | steamfitter |
| Industry | candy mfg. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Steamfitter |
| Township / Ward | Malden City |
| Est. Birth Year | ~1902 |
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 |
|---|---|---|---|---|
| Ruth Carlson | Daughter | — | 11 | ~1929 |
| John Carlson | Head | — | 38 | ~1902 |
| John Robertson | Other | — | 75 | ~1865 |
| John Carlson | Son | — | 10 | ~1930 |
| Bessie Carlson | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 18
Middlesex, Massachusetts · implied b. ~1902 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carlson |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Typist |
| Industry | Lithograph Company |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Head, age 28
Middlesex, Massachusetts · implied b. ~1902 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carlson |
| Given Name | John Henry |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 25 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Steam fitter |
| Industry | plumbing shop |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 5,000 |
| Radio Set | R |
| Veteran | No |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Head, age 38
Middlesex-County, Massachusetts · implied b. ~1902 — 5 household members
| Surname | Carlson |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 38 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Malden city |
| 1935 Residence (County) | Middlesex |
| Occupation | steamfitter |
| Industry | candy mfg. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 900 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 Carlson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Ernest Carlson (~0.92 confidence) and mother Amanda Carlson (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Ernest Carlson
b. ~1870
Source father
● Household
· direct · ~0.92
Mother
Amanda Carlson
b. ~1872
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Carlson
Head · 1940 · age 38 · b. ~1902 · 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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01609-00413)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Marjorie Macauley | 67 | Brother | — | Newfoundland |
| 2 | Louis Mairo | 32 | Head | Foreman | New York |
| 3 | Sadie Mairo | 30 | Wife | — | Canada English |
| 4 | Robert L. Mairo | 9 | Son | — | Massachusetts |
| 5 | Thomas Mairo | 2 | Son | — | Massachusetts |
| 6 | Gladys Harpell | 40 | Head | Housework | Massachusetts |
| 7 | Robert Harpell | 20 | Son | Radio Assembler | Massachusetts |
| 8 | Winona Harpell | 19 | Daughter | — | Massachusetts |
| 9 | Edward F. Reed | 37 | Head | Agent Steam | Massachusetts |
| 10 | Blanche Reed | 37 | Wife | — | Massachusetts |
| 11 | Irene B. Reed | 11 | Daughter | — | Massachusetts |
| 12 | Richard F. Reed | 7 | Son | — | Massachusetts |
| 14 | William Axe | 61 | Head | Salesman | Massachusetts |
| 15 | Lillian Axe | 56 | Wife | Forelady | Massachusetts |
| 16 | Ada Peterson | 54 | Sister in law | — | Massachusetts |
| 17 | Eugene Brostrom | 26 | Nephew | Driver | Massachusetts |
| 18 | John H. Carlson THIS PERSON | 38 | Head | Steamfitter | Massachusetts |
| 19 | Bessie R. Carlson | 42 | Wife | — | Massachusetts |
| 20 | Ruth R. Carlson | 11 | Daughter | — | Massachusetts |
| 21 | John J. Carlson | 10 | Son | — | Massachusetts |
| 22 | John Robertson | 75 | Father in law | — | Massachusetts |
| 23 | Harry E. Rae | 43 | Head | Brakeman | Canada English |
| 24 | Catherine Rae | 36 | Wife | — | Canada English |
| 25 | Grace M. Rae | 16 | Daughter | — | Canada English |
| 26 | Robert J. Rae | 15 | Son | — | Massachusetts |
| 27 | Ellen E. Rae | 14 | Daughter | — | Massachusetts |
| 28 | Gilbert R. Acres | 36 | Head | Ice Cream | Massachusetts |
| 29 | Alma C. Acres | 38 | Wife | — | Massachusetts |
| 30 | Marylyn J. Acres | 12 | Daughter | — | Massachusetts |
| 31 | Norma Griffin | 17 | Step daughter | Filing Clerk | Massachusetts |
| 32 | Charles Rockliffe | Radcliffe | 30 | Head | Manager | Massachusetts |
| 33 | Rose M. Rockliffe | Radcliffe | 30 | Wife | — | Massachusetts |
| 34 | Charles M. Rockliffe | Radcliffe | 2 | Son | — | Massachusetts |
| 35 | Clare Rockliffe | Radcliffe | 1 | Daughter | — | Massachusetts |
| 36 | Victoria Poirier | 66 | Mother in law | — | Canada French |
| 37 | Leonia Pata | 54 | Head | Cabinetmaker | Hungary |
| 38 | Rose Pata | 52 | Wife | — | Hungary |
| 39 | Alda Pata | 28 | Daughter | Salesgirl | Massachusetts |
| 40 | Marie Olson | 50 | Head | — | Massachusetts |
Pedigree Summary
John
Gen 1 · 2 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)